culori - npm Package Compare versions

Comparing version 0.5.1 to 0.5.2

build/culori.js

@@ -1457,2 +1457,69 @@ function parseNumber (color, len) {
 
+function convertRgbToYiq (rgb) {
+	var ref = convertRgbToLrgb(rgb);
+	var r = ref.r;
+	var g = ref.g;
+	var b = ref.b;
+	var alpha = ref.alpha;
+	var res = {
+		mode: 'yiq',
+		y: 0.29889531 * r + 0.58662247 * g + 0.11448223 * b,
+		i: 0.59597799 * r - 0.2741761 * g - 0.32180189 * b,
+		q: 0.21147017 * r - 0.52261711 * g + 0.31114694 * b
+	};
+	if (alpha !== undefined) { res.alpha = alpha; }
+	return res;
+}
+
+function convertYiqToRgb (ref) {
+		var y = ref.y;
+		var i = ref.i;
+		var q = ref.q;
+		var alpha = ref.alpha;
+
+		return convertLrgbToRgb({
+		r: y + 0.95608445 * i + 0.6208885 * q,
+		g: y - 0.27137664 * i - 0.6486059 * q,
+		b: y - 1.10561724 * i + 1.70250126 * q,
+		alpha: alpha
+	});
+}
+
+/*
+	YIQ Color Space
+
+	References
+	----------
+
+	Wikipedia:
+		https://en.wikipedia.org/wiki/YIQ
+
+	"Measuring perceived color difference using YIQ NTSC
+	transmission color space in mobile applications"
+		
+		by Yuriy Kotsarenko, Fernando Ramos in:
+		Programación Matemática y Software (2010) 
+
+	Available at:
+		
+		http://www.progmat.uaem.mx:8080/artVol2Num2/Articulo3Vol2Num2.pdf
+ */
+
+var yiqDef = {
+	mode: 'yiq',
+	output: {
+		rgb: convertYiqToRgb
+	},
+	input: {
+		rgb: convertRgbToYiq
+	},
+	channels: ['y', 'i', 'q', 'alpha'],
+	interpolate: {
+		y: interpolateFunctionLinear(interpolateNumber()),
+		i: interpolateFunctionLinear(interpolateNumber()),
+		q: interpolateFunctionLinear(interpolateNumber()),
+		alpha: interpolateFunctionLinear(interpolateAlpha())
+	}
+};
+
 var converters = {};
@@ -1872,4 +1939,5 @@ var modes = {};
 
-var differenceEuclidean = function (mode) {
+var differenceEuclidean = function (mode, weights) {
 	if ( mode === void 0 ) mode = 'rgb';
+	if ( weights === void 0 ) weights = [1, 1, 1];
 
@@ -1883,4 +1951,6 @@ var channels = getModeDefinition(mode).channels;
 			channels.reduce(
-				function (delta, k) { return delta +
-					(k === 'alpha' ? 0 : Math.pow(ConvStd[k] - ConvSmp[k], 2)); },
+				function (delta, k, idx) { return delta +
+					(k === 'alpha'
+						? 0
+						: weights[idx] * Math.pow(ConvStd[k] - ConvSmp[k], 2)); },
 				0
@@ -2078,2 +2148,15 @@ )
 
+/*
+	"Measuring perceived color difference using YIQ NTSC
+	transmission color space in mobile applications"
+		
+		by Yuriy Kotsarenko, Fernando Ramos in:
+		Programación Matemática y Software (2010) 
+
+	Available at:
+		
+		http://www.progmat.uaem.mx:8080/artVol2Num2/Articulo3Vol2Num2.pdf
+ */
+var differenceKotsarenkoRamos = function () { return differenceEuclidean('yiq', [0.5053, 0.299, 0.1957]); };
+
 // selects the vantage point
@@ -2156,2 +2239,3 @@ // currently does so randomly, but this could be optimized
 defineMode(dlchDef);
+defineMode(yiqDef);
 
@@ -2169,3 +2253,4 @@ var rgb$3 = converter('rgb');
 var dlch = converter('dlch');
+var yiq = converter('yiq');
 
-export { defineMode, converter, hsl, hsv, hsi, hwb$1 as hwb, rgb$3 as rgb, lab$1 as lab, lch$2 as lch, lrgb, cubehelix, dlab, dlch, formatter, round, interpolate, interpolateNumber, interpolateAlpha, interpolateHue, interpolateFunctionLinear, interpolateFunctionSpline, interpolateFunctionCosine, interpolateFunctionMonotone, samples, zip, displayable, clamp, nearest, getModeDefinition, parse, differenceEuclidean, differenceCie76, differenceCie94, differenceCiede2000, differenceCmc, differenceDin99o, named as colorsNamed };
+export { defineMode, converter, hsl, hsv, hsi, hwb$1 as hwb, rgb$3 as rgb, lab$1 as lab, lch$2 as lch, lrgb, cubehelix, dlab, dlch, yiq, formatter, round, interpolate, interpolateNumber, interpolateAlpha, interpolateHue, interpolateFunctionLinear, interpolateFunctionSpline, interpolateFunctionCosine, interpolateFunctionMonotone, samples, zip, displayable, clamp, nearest, getModeDefinition, parse, differenceEuclidean, differenceCie76, differenceCie94, differenceCiede2000, differenceCmc, differenceDin99o, differenceKotsarenkoRamos, named as colorsNamed };

build/culori.umd.js

@@ -1,1 +0,1 @@
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CHANGELOG.md

 ## Culori Changelog
 
-### 0.5.0
+### 0.5.2
 
-Removed default export from ES build, and cleaned up the build process. Added Prettier, ESLint.
+- Adds YIQ color space and Kotsarenko/Ramos color difference function (thanks [@mourner](https://github.com/mourner) for the pointer!)
+- Adds the _weights_ argument to _differenceEuclidean_
 
+### 0.5.1
+
+**Breaking:** Removed the `culori()` function, which was an alias for `culori.rgb()`. This makes the build simpler and clarifies the API a bit.
+
+Cleaned up the build process; added Prettier, ESLint.
+
 ### Previously
 
 Lost in the Fog of Time.

package.json

 {
 	"name": "culori",
-	"version": "0.5.1",
+	"version": "0.5.2",
 	"main": "build/culori.umd.js",
@@ -5,0 +5,0 @@ "browser": "build/culori.umd.js",

README.md

@@ -139,2 +139,3 @@ # Culori
 | `dlch`      | DIN99o LCh color space     | culori.**dlch**(_color_)                            |
+| `yiq`       | YIQ color space            | culori.**yiq**(_color_)                             |
 
@@ -232,6 +233,8 @@ <a name="culoriFormatter" href="#culoriFormatter">#</a> culori.**formatter**(_format = 'rgb'_) → _function (color)_ [<>](https://github.com/evercoder/culori/blob/master/src/formatter.js 'Source')
 
-<a name="culoriDifferenceEuclidean" href="#culoriDifferenceEuclidean">#</a> culori.**differenceEuclidean**(_mode = 'rgb'_) [<>](https://github.com/evercoder/culori/blob/master/src/difference.js 'Source')
+<a name="culoriDifferenceEuclidean" href="#culoriDifferenceEuclidean">#</a> culori.**differenceEuclidean**(_mode = 'rgb'_, _weights = [1, 1, 1]_) [<>](https://github.com/evercoder/culori/blob/master/src/difference.js 'Source')
 
 Returns a [Euclidean distance](https://en.wikipedia.org/wiki/Color_difference#Euclidean) function in a certain color space.
 
+You can optionally assign different weights to the channels in the color space. See, for example, the [Kotsarenko/Ramos distance](#culoriDifferenceKotsarenkoRamos).
+
 <a name="culoriDifferenceCie76" href="#culoriDifferenceCie76">#</a> culori.**differenceCie76**() [<>](https://github.com/evercoder/culori/blob/master/src/difference.js 'Source')
@@ -261,2 +264,6 @@
 
+<a name="culoriDifferenceKotsarenkoRamos" href="#culoriDifferenceKotsarenkoRamos">#</a> culori.**differenceKotsarenkoRamos**() [<>](https://github.com/evercoder/culori/blob/master/src/difference.js 'Source')
+
+Computes the [Kotsarenko/Ramos][kotsarekno-ramos] color difference between the colors _a_ and _b_. This is a weighted Euclidean distance in the [YIQ][yiq] color space.
+
 #### Nearest color(s)
@@ -361,1 +368,3 @@
 [din99ode]: https://de.wikipedia.org/wiki/DIN99-Farbraum#Farbabstandsformel
+[kotsarekno-ramos]: http://www.progmat.uaem.mx:8080/artVol2Num2/Articulo3Vol2Num2.pdf
+[yiq]: https://en.wikipedia.org/wiki/YIQ

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