├── ChromaKeyEffect.xcodeproj
    ├── project.pbxproj
    ├── project.xcworkspace
    │   ├── contents.xcworkspacedata
    │   └── xcshareddata
    │   │   └── IDEWorkspaceChecks.plist
    └── xcuserdata
    │   └── c4q.xcuserdatad
    │       └── xcschemes
    │           └── xcschememanagement.plist
└── ChromaKeyEffect
    ├── AppDelegate.swift
    ├── Assets.xcassets
        ├── AppIcon.appiconset
        │   └── Contents.json
        ├── Contents.json
        ├── down_arrow.imageset
        │   ├── Contents.json
        │   └── icons8-double_down_filled.png
        ├── squidward_green_screen.imageset
        │   ├── Contents.json
        │   └── Screen_Shot_2019-03-18_at_5.26.53_PM.jpg
        ├── underwater.imageset
        │   ├── Contents.json
        │   └── yannis-papanastasopoulos-340526-unsplash.jpg
        └── up_arrow.imageset
        │   ├── Contents.json
        │   └── icons8-double_up_filled.png
    ├── Base.lproj
        ├── LaunchScreen.storyboard
        └── Main.storyboard
    ├── Info.plist
    ├── README.md
    ├── Utilities
        └── ChromaKey.swift
    ├── View Controllers
        ├── CompositeImageViewController.swift
        ├── ForegroundViewController.swift
        └── PixelMapViewController.swift
    └── Views
        ├── CompositedImageView.swift
        ├── ForegroundView.swift
        └── MappedImageView.swift


/ChromaKeyEffect.xcodeproj/project.pbxproj:
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375 | 			defaultConfigurationName = Release;
376 | 		};
377 | 		816A0A29225A6CAE00F4A38C /* Build configuration list for PBXNativeTarget "ChromaKeyEffect" */ = {
378 | 			isa = XCConfigurationList;
379 | 			buildConfigurations = (
380 | 				816A0A2A225A6CAE00F4A38C /* Debug */,
381 | 				816A0A2B225A6CAE00F4A38C /* Release */,
382 | 			);
383 | 			defaultConfigurationIsVisible = 0;
384 | 			defaultConfigurationName = Release;
385 | 		};
386 | /* End XCConfigurationList section */
387 | 	};
388 | 	rootObject = 816A0A0F225A6CAA00F4A38C /* Project object */;
389 | }
390 | 


--------------------------------------------------------------------------------
/ChromaKeyEffect.xcodeproj/project.xcworkspace/contents.xcworkspacedata:
--------------------------------------------------------------------------------
1 | <?xml version="1.0" encoding="UTF-8"?>
2 | <Workspace
3 |    version = "1.0">
4 |    <FileRef
5 |       location = "self:ChromaKeyEffect.xcodeproj">
6 |    </FileRef>
7 | </Workspace>
8 | 


--------------------------------------------------------------------------------
/ChromaKeyEffect.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist:
--------------------------------------------------------------------------------
1 | <?xml version="1.0" encoding="UTF-8"?>
2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
3 | <plist version="1.0">
4 | <dict>
5 | 	<key>IDEDidComputeMac32BitWarning</key>
6 | 	<true/>
7 | </dict>
8 | </plist>
9 | 


--------------------------------------------------------------------------------
/ChromaKeyEffect.xcodeproj/xcuserdata/c4q.xcuserdatad/xcschemes/xcschememanagement.plist:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>SchemeUserState</key>
 6 | 	<dict>
 7 | 		<key>ChromaKeyEffect.xcscheme_^#shared#^_</key>
 8 | 		<dict>
 9 | 			<key>orderHint</key>
10 | 			<integer>0</integer>
11 | 		</dict>
12 | 	</dict>
13 | </dict>
14 | </plist>
15 | 


--------------------------------------------------------------------------------
/ChromaKeyEffect/AppDelegate.swift:
--------------------------------------------------------------------------------
 1 | import UIKit
 2 | 
 3 | @UIApplicationMain
 4 | class AppDelegate: UIResponder, UIApplicationDelegate {
 5 | 
 6 |     var window: UIWindow?
 7 | 
 8 | 
 9 |     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
10 |         // Override point for customization after application launch.
11 | 
12 |         return true
13 |     }
14 | 
15 |     func applicationWillResignActive(_ application: UIApplication) {
16 |         // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
17 |         // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
18 |     }
19 | 
20 |     func applicationDidEnterBackground(_ application: UIApplication) {
21 |         // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
22 |         // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
23 |     }
24 | 
25 |     func applicationWillEnterForeground(_ application: UIApplication) {
26 |         // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
27 |     }
28 | 
29 |     func applicationDidBecomeActive(_ application: UIApplication) {
30 |         // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
31 |     }
32 | 
33 |     func applicationWillTerminate(_ application: UIApplication) {
34 |         // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
35 |     }
36 | 
37 | 
38 | }
39 | 
40 | 


--------------------------------------------------------------------------------
/ChromaKeyEffect/Assets.xcassets/AppIcon.appiconset/Contents.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "images" : [
 3 |     {
 4 |       "idiom" : "iphone",
 5 |       "size" : "20x20",
 6 |       "scale" : "2x"
 7 |     },
 8 |     {
 9 |       "idiom" : "iphone",
10 |       "size" : "20x20",
11 |       "scale" : "3x"
12 |     },
13 |     {
14 |       "idiom" : "iphone",
15 |       "size" : "29x29",
16 |       "scale" : "2x"
17 |     },
18 |     {
19 |       "idiom" : "iphone",
20 |       "size" : "29x29",
21 |       "scale" : "3x"
22 |     },
23 |     {
24 |       "idiom" : "iphone",
25 |       "size" : "40x40",
26 |       "scale" : "2x"
27 |     },
28 |     {
29 |       "idiom" : "iphone",
30 |       "size" : "40x40",
31 |       "scale" : "3x"
32 |     },
33 |     {
34 |       "idiom" : "iphone",
35 |       "size" : "60x60",
36 |       "scale" : "2x"
37 |     },
38 |     {
39 |       "idiom" : "iphone",
40 |       "size" : "60x60",
41 |       "scale" : "3x"
42 |     },
43 |     {
44 |       "idiom" : "ipad",
45 |       "size" : "20x20",
46 |       "scale" : "1x"
47 |     },
48 |     {
49 |       "idiom" : "ipad",
50 |       "size" : "20x20",
51 |       "scale" : "2x"
52 |     },
53 |     {
54 |       "idiom" : "ipad",
55 |       "size" : "29x29",
56 |       "scale" : "1x"
57 |     },
58 |     {
59 |       "idiom" : "ipad",
60 |       "size" : "29x29",
61 |       "scale" : "2x"
62 |     },
63 |     {
64 |       "idiom" : "ipad",
65 |       "size" : "40x40",
66 |       "scale" : "1x"
67 |     },
68 |     {
69 |       "idiom" : "ipad",
70 |       "size" : "40x40",
71 |       "scale" : "2x"
72 |     },
73 |     {
74 |       "idiom" : "ipad",
75 |       "size" : "76x76",
76 |       "scale" : "1x"
77 |     },
78 |     {
79 |       "idiom" : "ipad",
80 |       "size" : "76x76",
81 |       "scale" : "2x"
82 |     },
83 |     {
84 |       "idiom" : "ipad",
85 |       "size" : "83.5x83.5",
86 |       "scale" : "2x"
87 |     },
88 |     {
89 |       "idiom" : "ios-marketing",
90 |       "size" : "1024x1024",
91 |       "scale" : "1x"
92 |     }
93 |   ],
94 |   "info" : {
95 |     "version" : 1,
96 |     "author" : "xcode"
97 |   }
98 | }


--------------------------------------------------------------------------------
/ChromaKeyEffect/Assets.xcassets/Contents.json:
--------------------------------------------------------------------------------
1 | {
2 |   "info" : {
3 |     "version" : 1,
4 |     "author" : "xcode"
5 |   }
6 | }


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/ChromaKeyEffect/Assets.xcassets/down_arrow.imageset/Contents.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "images" : [
 3 |     {
 4 |       "idiom" : "universal",
 5 |       "filename" : "icons8-double_down_filled.png",
 6 |       "scale" : "1x"
 7 |     },
 8 |     {
 9 |       "idiom" : "universal",
10 |       "scale" : "2x"
11 |     },
12 |     {
13 |       "idiom" : "universal",
14 |       "scale" : "3x"
15 |     }
16 |   ],
17 |   "info" : {
18 |     "version" : 1,
19 |     "author" : "xcode"
20 |   }
21 | }


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/ChromaKeyEffect/Assets.xcassets/down_arrow.imageset/icons8-double_down_filled.png:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/VikashHart/ChromaKeyEffect/a0ad47756e961af1c703c19e9053dce40cbcb5de/ChromaKeyEffect/Assets.xcassets/down_arrow.imageset/icons8-double_down_filled.png


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/ChromaKeyEffect/Assets.xcassets/squidward_green_screen.imageset/Contents.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "images" : [
 3 |     {
 4 |       "idiom" : "universal",
 5 |       "filename" : "Screen_Shot_2019-03-18_at_5.26.53_PM.jpg",
 6 |       "scale" : "1x"
 7 |     },
 8 |     {
 9 |       "idiom" : "universal",
10 |       "scale" : "2x"
11 |     },
12 |     {
13 |       "idiom" : "universal",
14 |       "scale" : "3x"
15 |     }
16 |   ],
17 |   "info" : {
18 |     "version" : 1,
19 |     "author" : "xcode"
20 |   }
21 | }


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/ChromaKeyEffect/Assets.xcassets/squidward_green_screen.imageset/Screen_Shot_2019-03-18_at_5.26.53_PM.jpg:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/VikashHart/ChromaKeyEffect/a0ad47756e961af1c703c19e9053dce40cbcb5de/ChromaKeyEffect/Assets.xcassets/squidward_green_screen.imageset/Screen_Shot_2019-03-18_at_5.26.53_PM.jpg


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/ChromaKeyEffect/Assets.xcassets/underwater.imageset/Contents.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "images" : [
 3 |     {
 4 |       "idiom" : "universal",
 5 |       "filename" : "yannis-papanastasopoulos-340526-unsplash.jpg",
 6 |       "scale" : "1x"
 7 |     },
 8 |     {
 9 |       "idiom" : "universal",
10 |       "scale" : "2x"
11 |     },
12 |     {
13 |       "idiom" : "universal",
14 |       "scale" : "3x"
15 |     }
16 |   ],
17 |   "info" : {
18 |     "version" : 1,
19 |     "author" : "xcode"
20 |   }
21 | }


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/ChromaKeyEffect/Assets.xcassets/underwater.imageset/yannis-papanastasopoulos-340526-unsplash.jpg:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/VikashHart/ChromaKeyEffect/a0ad47756e961af1c703c19e9053dce40cbcb5de/ChromaKeyEffect/Assets.xcassets/underwater.imageset/yannis-papanastasopoulos-340526-unsplash.jpg


--------------------------------------------------------------------------------
/ChromaKeyEffect/Assets.xcassets/up_arrow.imageset/Contents.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "images" : [
 3 |     {
 4 |       "idiom" : "universal",
 5 |       "filename" : "icons8-double_up_filled.png",
 6 |       "scale" : "1x"
 7 |     },
 8 |     {
 9 |       "idiom" : "universal",
10 |       "scale" : "2x"
11 |     },
12 |     {
13 |       "idiom" : "universal",
14 |       "scale" : "3x"
15 |     }
16 |   ],
17 |   "info" : {
18 |     "version" : 1,
19 |     "author" : "xcode"
20 |   }
21 | }


--------------------------------------------------------------------------------
/ChromaKeyEffect/Assets.xcassets/up_arrow.imageset/icons8-double_up_filled.png:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/VikashHart/ChromaKeyEffect/a0ad47756e961af1c703c19e9053dce40cbcb5de/ChromaKeyEffect/Assets.xcassets/up_arrow.imageset/icons8-double_up_filled.png


--------------------------------------------------------------------------------
/ChromaKeyEffect/Base.lproj/LaunchScreen.storyboard:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14460.31" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
 3 |     <device id="retina4_7" orientation="portrait">
 4 |         <adaptation id="fullscreen"/>
 5 |     </device>
 6 |     <dependencies>
 7 |         <deployment identifier="iOS"/>
 8 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14460.20"/>
 9 |         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
10 |         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
11 |     </dependencies>
12 |     <scenes>
13 |         <!--View Controller-->
14 |         <scene sceneID="EHf-IW-A2E">
15 |             <objects>
16 |                 <viewController id="01J-lp-oVM" sceneMemberID="viewController">
17 |                     <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
18 |                         <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
19 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
20 |                         <subviews>
21 |                             <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Chroma Key Effect" textAlignment="center" lineBreakMode="tailTruncation" numberOfLines="0" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="Xs1-ia-VQd">
22 |                                 <rect key="frame" x="36.5" y="321" width="302.5" height="45.5"/>
23 |                                 <fontDescription key="fontDescription" type="system" pointSize="38"/>
24 |                                 <color key="textColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
25 |                                 <nil key="highlightedColor"/>
26 |                             </label>
27 |                         </subviews>
28 |                         <color key="backgroundColor" red="0.03941542957" green="0.7227355647" blue="0.060771994760000003" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
29 |                         <constraints>
30 |                             <constraint firstItem="Xs1-ia-VQd" firstAttribute="centerY" secondItem="6Tk-OE-BBY" secondAttribute="centerY" id="WQ9-ep-GnC"/>
31 |                             <constraint firstItem="Xs1-ia-VQd" firstAttribute="centerX" secondItem="6Tk-OE-BBY" secondAttribute="centerX" id="hJ7-F6-wvw"/>
32 |                         </constraints>
33 |                         <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
34 |                     </view>
35 |                 </viewController>
36 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
37 |             </objects>
38 |             <point key="canvasLocation" x="53" y="375"/>
39 |         </scene>
40 |     </scenes>
41 | </document>
42 | 


--------------------------------------------------------------------------------
/ChromaKeyEffect/Base.lproj/Main.storyboard:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14460.31" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
 3 |     <device id="retina4_7" orientation="portrait">
 4 |         <adaptation id="fullscreen"/>
 5 |     </device>
 6 |     <dependencies>
 7 |         <deployment identifier="iOS"/>
 8 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14460.20"/>
 9 |         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
10 |         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
11 |     </dependencies>
12 |     <scenes>
13 |         <!--Foreground View Controller-->
14 |         <scene sceneID="tne-QT-ifu">
15 |             <objects>
16 |                 <viewController id="BYZ-38-t0r" customClass="ForegroundViewController" customModule="ChromaKeyEffect" customModuleProvider="target" sceneMemberID="viewController">
17 |                     <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
18 |                         <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
19 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
20 |                         <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
21 |                         <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
22 |                     </view>
23 |                 </viewController>
24 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
25 |             </objects>
26 |         </scene>
27 |     </scenes>
28 | </document>
29 | 


--------------------------------------------------------------------------------
/ChromaKeyEffect/Info.plist:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>CFBundleDevelopmentRegion</key>
 6 | 	<string>$(DEVELOPMENT_LANGUAGE)</string>
 7 | 	<key>CFBundleExecutable</key>
 8 | 	<string>$(EXECUTABLE_NAME)</string>
 9 | 	<key>CFBundleIdentifier</key>
10 | 	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
11 | 	<key>CFBundleInfoDictionaryVersion</key>
12 | 	<string>6.0</string>
13 | 	<key>CFBundleName</key>
14 | 	<string>$(PRODUCT_NAME)</string>
15 | 	<key>CFBundlePackageType</key>
16 | 	<string>APPL</string>
17 | 	<key>CFBundleShortVersionString</key>
18 | 	<string>1.0</string>
19 | 	<key>CFBundleVersion</key>
20 | 	<string>1</string>
21 | 	<key>LSRequiresIPhoneOS</key>
22 | 	<true/>
23 | 	<key>UILaunchStoryboardName</key>
24 | 	<string>LaunchScreen</string>
25 | 	<key>UIMainStoryboardFile</key>
26 | 	<string>Main</string>
27 | 	<key>UIRequiredDeviceCapabilities</key>
28 | 	<array>
29 | 		<string>armv7</string>
30 | 	</array>
31 | 	<key>UISupportedInterfaceOrientations</key>
32 | 	<array>
33 | 		<string>UIInterfaceOrientationPortrait</string>
34 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
35 | 		<string>UIInterfaceOrientationLandscapeRight</string>
36 | 	</array>
37 | 	<key>UISupportedInterfaceOrientations~ipad</key>
38 | 	<array>
39 | 		<string>UIInterfaceOrientationPortrait</string>
40 | 		<string>UIInterfaceOrientationPortraitUpsideDown</string>
41 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
42 | 		<string>UIInterfaceOrientationLandscapeRight</string>
43 | 	</array>
44 | </dict>
45 | </plist>
46 | 


--------------------------------------------------------------------------------
/ChromaKeyEffect/README.md:
--------------------------------------------------------------------------------
1 | Chroma Key Effect Green Screen App
2 | 
3 | Sample App to show how to create a green screen app using the Chroma Key Effect in the CoreImage framework.
4 | 


--------------------------------------------------------------------------------
/ChromaKeyEffect/Utilities/ChromaKey.swift:
--------------------------------------------------------------------------------
 1 | import UIKit
 2 | 
 3 | class ChromaKey {
 4 | 
 5 |     // Hue ranges from and to values
 6 |     let startRange: CGFloat = 0.3
 7 |     let endRange: CGFloat = 0.4
 8 | 
 9 |     // Get hue function
10 |     func getHue(red: CGFloat, green: CGFloat, blue: CGFloat) -> CGFloat {
11 |         let color = UIColor(red: red, green: green, blue: blue, alpha: 1)
12 |         var hue: CGFloat = 0
13 |         color.getHue(&hue, saturation: nil, brightness: nil, alpha: nil)
14 |         return hue
15 |     }
16 | 
17 |     // Create Chroma Key Filter function
18 |     func chromaKeyFilter(fromHue: CGFloat, toHue: CGFloat) -> CIFilter? {
19 |         // 1
20 |         let size = 64
21 |         var cubeRGB = [Float]()
22 | 
23 |         // 2
24 |         for z in 0 ..< size {
25 |             let blue = CGFloat(z) / CGFloat(size-1)
26 |             for y in 0 ..< size {
27 |                 let green = CGFloat(y) / CGFloat(size-1)
28 |                 for x in 0 ..< size {
29 |                     let red = CGFloat(x) / CGFloat(size-1)
30 | 
31 |                     // 3
32 |                     let hue = getHue(red: red, green: green, blue: blue)
33 |                     let alpha: CGFloat = (hue >= fromHue && hue <= toHue) ? 0: 1
34 | 
35 |                     // 4
36 |                     cubeRGB.append(Float(red * alpha))
37 |                     cubeRGB.append(Float(green * alpha))
38 |                     cubeRGB.append(Float(blue * alpha))
39 |                     cubeRGB.append(Float(alpha))
40 |                 }
41 |             }
42 |         }
43 | 
44 |         let data = Data(buffer: UnsafeBufferPointer(start: &cubeRGB, count: cubeRGB.count))
45 | 
46 |         // 5
47 |         let colorCubeFilter = CIFilter(name: "CIColorCube", parameters: ["inputCubeDimension": size, "inputCubeData": data])
48 |         return colorCubeFilter
49 |     }
50 | 
51 |     // Separated code
52 |     // Pixel filtering function
53 |     func filterPixels(foregroundCIImage: CIImage) -> CIImage {
54 |         // Remove Green from the Source Image
55 |         let chromaCIFilter = self.chromaKeyFilter(fromHue: startRange, toHue: endRange)
56 |         chromaCIFilter?.setValue(foregroundCIImage, forKey: kCIInputImageKey)
57 |         let sourceCIImageWithoutBackground = chromaCIFilter?.outputImage
58 |         var image = CIImage()
59 |         if let filteredImage = sourceCIImageWithoutBackground {
60 |             image = filteredImage
61 |         }
62 |         return image
63 |     }
64 | 
65 |     // Image compositing function
66 |     func compositeImages(foregroundCIImage: CIImage, backgroundCIImage: CIImage) -> CIImage {
67 |         // Composite over a Background Image
68 |         let compositor = CIFilter(name:"CISourceOverCompositing")
69 |         compositor?.setValue(foregroundCIImage, forKey: kCIInputImageKey)
70 |         compositor?.setValue(backgroundCIImage, forKey: kCIInputBackgroundImageKey)
71 |         let compositedCIImage = compositor?.outputImage
72 |         var image = CIImage()
73 |         if let compositeImage = compositedCIImage {
74 |             image = compositeImage
75 |         }
76 |         return image
77 |     }
78 | 
79 |     // Complete combined filtering and compositing function
80 |     func filterAndComposite(foregroundCIImage: CIImage, backgroundCIImage: CIImage) -> CIImage? {
81 |         // Remove Green from the Source Image
82 |         let chromaCIFilter = self.chromaKeyFilter(fromHue: startRange, toHue: endRange)
83 |         chromaCIFilter?.setValue(foregroundCIImage, forKey: kCIInputImageKey)
84 |         let sourceCIImageWithoutBackground = chromaCIFilter?.outputImage
85 | 
86 |         // Composite over a Background Image
87 |         let compositor = CIFilter(name:"CISourceOverCompositing")
88 |         compositor?.setValue(sourceCIImageWithoutBackground, forKey: kCIInputImageKey)
89 |         compositor?.setValue(backgroundCIImage, forKey: kCIInputBackgroundImageKey)
90 |         let compositedCIImage = compositor?.outputImage
91 | 
92 |         return compositedCIImage
93 |     }
94 | }
95 | 


--------------------------------------------------------------------------------
/ChromaKeyEffect/View Controllers/CompositeImageViewController.swift:
--------------------------------------------------------------------------------
 1 | import UIKit
 2 | 
 3 | class CompositeImageViewController: UIViewController {
 4 | 
 5 |     var formattedImage: CIImage?
 6 |     let chromaKey = ChromaKey()
 7 |     let compositedImageView = CompositedImageView()
 8 | 
 9 |     override func viewDidLoad() {
10 |         super.viewDidLoad()
11 |         view.backgroundColor = .white
12 |         setupViews()
13 |     }
14 | 
15 |     override func viewWillAppear(_ animated: Bool) {
16 |         super.viewWillAppear(true)
17 |         DispatchQueue.main.async {
18 |             if let image = UIImage(named: "underwater"),
19 |                 let backgroundImage = CIImage(image: image),
20 |                 let filteredImage = self.formattedImage {
21 |                 let compositedImage = self.chromaKey.compositeImages(foregroundCIImage: filteredImage, backgroundCIImage: backgroundImage)
22 |                 self.compositedImageView.compositedImageView.image = UIImage(ciImage: compositedImage)
23 |             }
24 |         }
25 |     }
26 | 
27 |     init(image: CIImage) {
28 |         super.init(nibName: nil, bundle: nil)
29 |         self.formattedImage = image
30 |     }
31 | 
32 |     required init?(coder aDecoder: NSCoder) {
33 |         fatalError()
34 |     }
35 | 
36 |     private func setupViews() {
37 |         setupCompositedImageView()
38 |     }
39 | 
40 |     private func setupCompositedImageView() {
41 |         view.addSubview(compositedImageView)
42 |         compositedImageView.translatesAutoresizingMaskIntoConstraints = false
43 |         NSLayoutConstraint.activate([
44 |             compositedImageView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
45 |             compositedImageView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
46 |             compositedImageView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
47 |             compositedImageView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor)
48 |             ])
49 |     }
50 | }
51 | 


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/ChromaKeyEffect/View Controllers/ForegroundViewController.swift:
--------------------------------------------------------------------------------
 1 | import UIKit
 2 | 
 3 | class ForegroundViewController: UIViewController {
 4 | 
 5 |     private let foregroundView = ForegroundView()
 6 | 
 7 |     override func viewDidLoad() {
 8 |         super.viewDidLoad()
 9 |         view.backgroundColor = .white
10 |         setupViews()
11 |         self.foregroundView.removeGreenButton.addTarget(self, action: #selector(removeGreen), for: .touchUpInside)
12 |     }
13 | 
14 |     @objc func removeGreen() {
15 |         guard let originalImage = foregroundView.greenScreenImage, let image = CIImage(image: originalImage) else { return }
16 |         let pixelFilterVC = PixelMapViewController(image: image)
17 |         self.present(pixelFilterVC, animated: true, completion: nil)
18 |     }
19 | 
20 |     private func setupViews() {
21 |         setupForegroundView()
22 |     }
23 | 
24 |     private func setupForegroundView() {
25 |         view.addSubview(foregroundView)
26 |         foregroundView.translatesAutoresizingMaskIntoConstraints = false
27 |         NSLayoutConstraint.activate([
28 |             foregroundView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
29 |             foregroundView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
30 |             foregroundView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
31 |             foregroundView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor)
32 |             ])
33 |     }
34 | }
35 | 


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/ChromaKeyEffect/View Controllers/PixelMapViewController.swift:
--------------------------------------------------------------------------------
 1 | import UIKit
 2 | 
 3 | class PixelMapViewController: UIViewController {
 4 |     
 5 |     var unformattedImage: CIImage?
 6 |     var mappedImage = CIImage()
 7 |     let chromaKey = ChromaKey()
 8 |     let mappedImageView = MappedImageView()
 9 | 
10 |     override func viewDidLoad() {
11 |         super.viewDidLoad()
12 |         view.backgroundColor = .white
13 |         setupViews()
14 |         self.mappedImageView.createCompositeButton.addTarget(self, action: #selector(createCompositeImage), for: .touchUpInside)
15 |     }
16 | 
17 |     override func viewWillAppear(_ animated: Bool) {
18 |         super.viewWillAppear(true)
19 |         if let unfilteredImage = unformattedImage {
20 |             let filteredImage = self.chromaKey.filterPixels(foregroundCIImage: unfilteredImage)
21 |             mappedImage = filteredImage
22 | 
23 |             mappedImageView.processedImageView.image = UIImage(ciImage: filteredImage)
24 |         }
25 |     }
26 | 
27 |     init(image: CIImage) {
28 |         super.init(nibName: nil, bundle: nil)
29 |         self.unformattedImage = image
30 |     }
31 | 
32 |     required init?(coder aDecoder: NSCoder) {
33 |         fatalError()
34 |     }
35 | 
36 |     @objc func createCompositeImage() {
37 |         print("processing")
38 |         let compositeImageVC = CompositeImageViewController(image: mappedImage)
39 |             print("completed")
40 |             self.present(compositeImageVC, animated: true, completion: nil)
41 |     }
42 | 
43 |     private func setupViews() {
44 |         setupMappedImageView()
45 |     }
46 | 
47 |     private func setupMappedImageView() {
48 |         view.addSubview(mappedImageView)
49 |         mappedImageView.translatesAutoresizingMaskIntoConstraints = false
50 |         NSLayoutConstraint.activate([
51 |             mappedImageView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
52 |             mappedImageView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
53 |             mappedImageView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
54 |             mappedImageView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor)
55 |             ])
56 |     }
57 | }
58 | 


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/ChromaKeyEffect/Views/CompositedImageView.swift:
--------------------------------------------------------------------------------
  1 | import UIKit
  2 | 
  3 | class CompositedImageView: UIView {
  4 | 
  5 |     lazy var originalImageView: UIImageView = {
  6 |         let imageView = UIImageView()
  7 |         let image = UIImage(named: "squidward_green_screen")
  8 |         imageView.image = image
  9 |         imageView.contentMode = .scaleAspectFit
 10 |         imageView.backgroundColor = .clear
 11 |         imageView.layer.masksToBounds = true
 12 |         imageView.layer.borderColor = UIColor.red.cgColor
 13 |         imageView.layer.borderWidth = 4
 14 |         imageView.translatesAutoresizingMaskIntoConstraints = false
 15 |         return imageView
 16 |     }()
 17 | 
 18 |     lazy var downArrowImageView: UIImageView = {
 19 |         let imageView = UIImageView()
 20 |         let image = UIImage(named: "down_arrow")?.withRenderingMode(.alwaysTemplate)
 21 |         imageView.image = image
 22 |         imageView.tintColor = .black
 23 |         imageView.contentMode = .scaleAspectFit
 24 |         imageView.backgroundColor = .clear
 25 |         imageView.layer.masksToBounds = true
 26 |         imageView.translatesAutoresizingMaskIntoConstraints = false
 27 |         return imageView
 28 |     }()
 29 | 
 30 |     lazy var compositedImageView: UIImageView = {
 31 |         let imageView = UIImageView()
 32 |         imageView.contentMode = .scaleAspectFit
 33 |         imageView.backgroundColor = .clear
 34 |         imageView.layer.masksToBounds = true
 35 |         imageView.layer.borderColor = UIColor.green.cgColor
 36 |         imageView.layer.borderWidth = 5
 37 |         imageView.translatesAutoresizingMaskIntoConstraints = false
 38 |         return imageView
 39 |     }()
 40 | 
 41 |     lazy var upArrowImageView: UIImageView = {
 42 |         let imageView = UIImageView()
 43 |         let image = UIImage(named: "up_arrow")?.withRenderingMode(.alwaysTemplate)
 44 |         imageView.image = image
 45 |         imageView.tintColor = .black
 46 |         imageView.contentMode = .scaleAspectFit
 47 |         imageView.backgroundColor = .clear
 48 |         imageView.layer.masksToBounds = true
 49 |         imageView.translatesAutoresizingMaskIntoConstraints = false
 50 |         return imageView
 51 |     }()
 52 | 
 53 |     lazy var backgroundImageView: UIImageView = {
 54 |         let imageView = UIImageView()
 55 |         let image = UIImage(named: "underwater")
 56 |         imageView.image = image
 57 |         imageView.contentMode = .scaleAspectFit
 58 |         imageView.backgroundColor = .clear
 59 |         imageView.layer.masksToBounds = true
 60 |         imageView.layer.borderColor = UIColor.red.cgColor
 61 |         imageView.layer.borderWidth = 4
 62 |         imageView.translatesAutoresizingMaskIntoConstraints = false
 63 |         return imageView
 64 |     }()
 65 | 
 66 |     required init?(coder aDecoder: NSCoder) {
 67 |         super.init(coder: aDecoder)
 68 |         commonInit()
 69 |     }
 70 | 
 71 |     override init(frame: CGRect) {
 72 |         super.init(frame: .zero)
 73 |         commonInit()
 74 |     }
 75 | 
 76 |     private func commonInit() {
 77 |         backgroundColor = .white
 78 |         setupViews()
 79 |     }
 80 | 
 81 |     private func setupViews() {
 82 |         setupCompositeImageView()
 83 |         setupDownArrowImageView()
 84 |         setupUpArrowImageView()
 85 |         setupOriginalImageView()
 86 |         setupBackgroundImageView()
 87 |     }
 88 | 
 89 |     private func setupCompositeImageView() {
 90 |         addSubview(compositedImageView)
 91 |         NSLayoutConstraint.activate([
 92 |             compositedImageView.centerXAnchor.constraint(equalTo: centerXAnchor),
 93 |             compositedImageView.centerYAnchor.constraint(equalTo: centerYAnchor),
 94 |             compositedImageView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 20),
 95 |             compositedImageView.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -20),
 96 |             compositedImageView.heightAnchor.constraint(equalToConstant: 205)
 97 |             ])
 98 |     }
 99 | 
100 |     private func setupDownArrowImageView() {
101 |         addSubview(downArrowImageView)
102 |         NSLayoutConstraint.activate([
103 |             downArrowImageView.bottomAnchor.constraint(equalTo: compositedImageView.topAnchor, constant: -20),
104 |             downArrowImageView.heightAnchor.constraint(equalToConstant: 40),
105 |             downArrowImageView.widthAnchor.constraint(equalToConstant: 40),
106 |             downArrowImageView.centerXAnchor.constraint(equalTo: centerXAnchor)
107 |             ])
108 |     }
109 | 
110 |     private func setupUpArrowImageView() {
111 |         addSubview(upArrowImageView)
112 |         NSLayoutConstraint.activate([
113 |             upArrowImageView.topAnchor.constraint(equalTo: compositedImageView.bottomAnchor, constant: 20),
114 |             upArrowImageView.heightAnchor.constraint(equalToConstant: 40),
115 |             upArrowImageView.widthAnchor.constraint(equalToConstant: 40),
116 |             upArrowImageView.centerXAnchor.constraint(equalTo: centerXAnchor)
117 |             ])
118 |     }
119 | 
120 |     private func setupOriginalImageView() {
121 |         addSubview(originalImageView)
122 |         NSLayoutConstraint.activate([
123 |             originalImageView.bottomAnchor.constraint(equalTo: downArrowImageView.topAnchor, constant: -20),
124 |             originalImageView.heightAnchor.constraint(equalToConstant: 180),
125 |             originalImageView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 40),
126 |             originalImageView.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -40),
127 |             originalImageView.centerXAnchor.constraint(equalTo: centerXAnchor)
128 |             ])
129 |     }
130 | 
131 |     private func setupBackgroundImageView() {
132 |         addSubview(backgroundImageView)
133 |         NSLayoutConstraint.activate([
134 |             backgroundImageView.topAnchor.constraint(equalTo: upArrowImageView.bottomAnchor, constant: 20),
135 |             backgroundImageView.heightAnchor.constraint(equalToConstant: 180),
136 |             backgroundImageView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 40),
137 |             backgroundImageView.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -40),
138 |             backgroundImageView.centerXAnchor.constraint(equalTo: centerXAnchor)
139 |             ])
140 |     }
141 | }
142 | 


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/ChromaKeyEffect/Views/ForegroundView.swift:
--------------------------------------------------------------------------------
 1 | import UIKit
 2 | 
 3 | class ForegroundView: UIView {
 4 | 
 5 |     let greenScreenImage = UIImage(named: "squidward_green_screen")
 6 | 
 7 |     lazy var foregroundImageView: UIImageView = {
 8 |         let imageView = UIImageView()
 9 |         let image = greenScreenImage
10 |         imageView.image = image
11 |         imageView.contentMode = .scaleAspectFit
12 |         imageView.backgroundColor = .red
13 |         imageView.layer.masksToBounds = true
14 |         imageView.layer.borderColor = UIColor.black.cgColor
15 |         imageView.layer.borderWidth = 1
16 |         imageView.translatesAutoresizingMaskIntoConstraints = false
17 |         return imageView
18 |     }()
19 | 
20 |     lazy var removeGreenButton: UIButton = {
21 |         let button = UIButton()
22 |         button.setTitle("Remove Green", for: .normal)
23 |         button.setTitleColor(.black, for: .normal)
24 |         button.titleEdgeInsets = UIEdgeInsets(top: 0, left: 5, bottom: 0, right: 5)
25 |         button.titleLabel?.adjustsFontSizeToFitWidth = true
26 |         button.backgroundColor = .clear
27 |         button.layer.cornerRadius = 10
28 |         button.layer.masksToBounds = true
29 |         button.layer.borderColor = UIColor.black.cgColor
30 |         button.layer.borderWidth = 2
31 |         button.translatesAutoresizingMaskIntoConstraints = false
32 |         return button
33 |     }()
34 | 
35 |     required init?(coder aDecoder: NSCoder) {
36 |         super.init(coder: aDecoder)
37 |         commonInit()
38 |     }
39 | 
40 |     override init(frame: CGRect) {
41 |         super.init(frame: .zero)
42 |         commonInit()
43 |     }
44 | 
45 |     private func commonInit() {
46 |         backgroundColor = .white
47 |         setupViews()
48 |     }
49 | 
50 |     private func setupViews() {
51 |         setupImageView()
52 |         setupButton()
53 |     }
54 | 
55 |     private func setupImageView() {
56 |         addSubview(foregroundImageView)
57 |         NSLayoutConstraint.activate([
58 |             foregroundImageView.centerXAnchor.constraint(equalTo: centerXAnchor),
59 |             foregroundImageView.centerYAnchor.constraint(equalTo: centerYAnchor),
60 |             foregroundImageView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 20),
61 |             foregroundImageView.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -20),
62 |             foregroundImageView.heightAnchor.constraint(equalToConstant: 205)
63 |             ])
64 |     }
65 | 
66 |     private func setupButton() {
67 |         addSubview(removeGreenButton)
68 |         NSLayoutConstraint.activate([
69 |             removeGreenButton.topAnchor.constraint(equalTo: foregroundImageView.bottomAnchor, constant: 30),
70 |             removeGreenButton.centerXAnchor.constraint(equalTo: centerXAnchor)
71 |             ])
72 |     }
73 | }
74 | 


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/ChromaKeyEffect/Views/MappedImageView.swift:
--------------------------------------------------------------------------------
 1 | import UIKit
 2 | 
 3 | class MappedImageView: UIView {
 4 | 
 5 |     lazy var processedImageView: UIImageView = {
 6 |         let imageView = UIImageView()
 7 |         imageView.contentMode = .scaleAspectFit
 8 |         imageView.backgroundColor = .red
 9 |         imageView.layer.masksToBounds = true
10 |         imageView.layer.borderColor = UIColor.black.cgColor
11 |         imageView.layer.borderWidth = 1
12 |         imageView.translatesAutoresizingMaskIntoConstraints = false
13 |         return imageView
14 |     }()
15 | 
16 |     lazy var createCompositeButton: UIButton = {
17 |         let button = UIButton()
18 |         button.setTitle("Create Composite Image", for: .normal)
19 |         button.setTitleColor(.black, for: .normal)
20 |         button.titleEdgeInsets = UIEdgeInsets(top: 0, left: 5, bottom: 0, right: 5)
21 |         button.titleLabel?.adjustsFontSizeToFitWidth = true
22 |         button.backgroundColor = .clear
23 |         button.layer.cornerRadius = 10
24 |         button.layer.masksToBounds = true
25 |         button.layer.borderColor = UIColor.black.cgColor
26 |         button.layer.borderWidth = 2
27 |         button.translatesAutoresizingMaskIntoConstraints = false
28 |         return button
29 |     }()
30 | 
31 |     required init?(coder aDecoder: NSCoder) {
32 |         super.init(coder: aDecoder)
33 |         commonInit()
34 |     }
35 | 
36 |     override init(frame: CGRect) {
37 |         super.init(frame: .zero)
38 |         commonInit()
39 |     }
40 | 
41 |     private func commonInit() {
42 |         backgroundColor = .white
43 |         setupViews()
44 |     }
45 | 
46 |     private func setupViews() {
47 |         setupImageView()
48 |         setupButton()
49 |     }
50 | 
51 |     private func setupImageView() {
52 |         addSubview(processedImageView)
53 |         NSLayoutConstraint.activate([
54 |             processedImageView.centerXAnchor.constraint(equalTo: centerXAnchor),
55 |             processedImageView.centerYAnchor.constraint(equalTo: centerYAnchor),
56 |             processedImageView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 20),
57 |             processedImageView.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -20),
58 |             processedImageView.heightAnchor.constraint(equalToConstant: 205)
59 |             ])
60 |     }
61 | 
62 |     private func setupButton() {
63 |         addSubview(createCompositeButton)
64 |         NSLayoutConstraint.activate([
65 |             createCompositeButton.topAnchor.constraint(equalTo: processedImageView.bottomAnchor, constant: 30),
66 |             createCompositeButton.centerXAnchor.constraint(equalTo: centerXAnchor)
67 |             ])
68 |     }
69 | }
70 | 


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