├── tests
    └── basic.js
├── package.json
├── README.md
└── ryb2rgb.js


/tests/basic.js:
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1 | var ryb2rgb = require('../ryb2rgb');
2 | console.log(ryb2rgb([0, 255, 0]));
3 | 


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/package.json:
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 1 | {
 2 |   "name": "ryb2rgb",
 3 |   "description": "Convert colors in JavaScript from ryb to rgb",
 4 |   "author": "Dave Eddy <dave@daveeddy.com> (http://www.daveeddy.com)",
 5 |   "version": "0.0.0",
 6 |   "repository": {
 7 |     "url": "https://github.com/bahamas10/node-ryb2rgb.git",
 8 |     "type": "git"
 9 |   },
10 |   "main": "ryb2rgb.js",
11 |   "scripts" : {
12 |     "test": "for f in tests/*.js; do echo \"$f\"; node \"$f\" || exit 1; echo; done; echo 'Passed'"
13 |   },
14 |   "dependencies": {},
15 |   "devDependencies": {},
16 |   "optionalDependencies": {},
17 |   "bin": {},
18 |   "engines": {
19 |     "node": "*"
20 |   },
21 |   "keywords": [ "color", "rgb", "ryb" ]
22 | }
23 | 


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/README.md:
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 1 | ryb2rgb
 2 | =======
 3 | 
 4 | Convert colors in JavaScript from ryb to rgb
 5 | 
 6 | Example
 7 | -------
 8 | 
 9 | ### ryb2rgb
10 | 
11 | ``` js
12 | var ryb2rgb = require('ryb2rgb');
13 | console.log(ryb2rgb([0, 255, 0]));
14 | ```
15 | 
16 | yields
17 | 
18 | ``` js
19 | [255, 255, 0]
20 | ```
21 | 
22 | Usage
23 | -----
24 | 
25 | ``` js
26 | var ryb2rgb = require('ryb2rgb');
27 | ```
28 | 
29 | or
30 | 
31 | ``` html
32 | <script src="ryb2rgb.js"></script>
33 | // defines ryb2rgb()
34 | ```
35 | 
36 | Installation
37 | ------------
38 | 
39 |     npm install ryb2rgb
40 | 
41 | Credits
42 | -------
43 | 
44 | Original code https://www.paintassistant.com/rybrgb.html
45 | 
46 | Made generic for the web and Node.js
47 | 
48 | License
49 | -------
50 | 
51 | MIT
52 | 


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/ryb2rgb.js:
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 1 | /**
 2 |  * Original Work
 3 |  * http://www.paintassistant.com/rybrgb.html
 4 |  * Modified by Dave Eddy <dave@daveeddy.com>
 5 |  */
 6 | 
 7 | ;(function() {
 8 |   function cubicInt(t, A, B){
 9 |     var weight = t*t*(3-2*t);
10 |     return A + weight*(B-A);
11 |   }
12 | 
13 |   function getR(iR, iY, iB) {
14 |     // red
15 |     var x0 = cubicInt(iB, 1.0, 0.163);
16 |     var x1 = cubicInt(iB, 1.0, 0.0);
17 |     var x2 = cubicInt(iB, 1.0, 0.5);
18 |     var x3 = cubicInt(iB, 1.0, 0.2);
19 |     var y0 = cubicInt(iY, x0, x1);
20 |     var y1 = cubicInt(iY, x2, x3);
21 |     return Math.ceil (255 * cubicInt(iR, y0, y1));
22 |   }
23 | 
24 |   function getG(iR, iY, iB) {
25 |     // green
26 |     var x0 = cubicInt(iB, 1.0, 0.373);
27 |     var x1 = cubicInt(iB, 1.0, 0.66);
28 |     var x2 = cubicInt(iB, 0.0, 0.0);
29 |     var x3 = cubicInt(iB, 0.5, 0.094);
30 |     var y0 = cubicInt(iY, x0, x1);
31 |     var y1 = cubicInt(iY, x2, x3);
32 |     return Math.ceil (255 * cubicInt(iR, y0, y1));
33 |   }
34 | 
35 |   function getB(iR, iY, iB) {
36 |     // blue
37 |     var x0 = cubicInt(iB, 1.0, 0.6);
38 |     var x1 = cubicInt(iB, 0.0, 0.2);
39 |     var x2 = cubicInt(iB, 0.0, 0.5);
40 |     var x3 = cubicInt(iB, 0.0, 0.0);
41 |     var y0 = cubicInt(iY, x0, x1);
42 |     var y1 = cubicInt(iY, x2, x3);
43 |     return Math.ceil (255 * cubicInt(iR, y0, y1));
44 |   }
45 | 
46 |   function ryb2rgb(color){
47 |     var R = color[0] / 255;
48 |     var Y = color[1] / 255;
49 |     var B = color[2] / 255;
50 |     var R1 = getR(R,Y,B) ;
51 |     var G1 = getG(R,Y,B) ;
52 |     var B1 = getB(R,Y,B) ;
53 |     var ret = [ R1, G1, B1 ];
54 |     return ret;
55 |   }
56 | 
57 |   // export
58 |   if (typeof module !== 'undefined') {
59 |     module.exports = ryb2rgb;
60 |   } else {
61 |     window.ryb2rgb = ryb2rgb;
62 |   }
63 | })();
64 | 


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