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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 | 4x 4x 4x 2x 2x 2x 2x 88x 88x 2x 2x 2x 12x 12x 2x 2x 88x 88x 528x 125x 125x 125x 125x 125x 125x 39x 39x 124x 6x 6x 39x 33x 33x 33x 2x | import { QuantizedColor } from "./color-quantization";
import { ColorHSL } from "./color-hsl";
import { rgbToHSL } from "./color-converters";
/**
* @public
*/
export interface PaletteEntryConstraint {
id: string;
targetSaturation: number;
minSaturation: number;
maxSaturation: number;
targetLuminosity: number;
minLuminosity: number;
maxLuminosity: number;
}
/**
* @public
*/
export interface PaletteEntry {
found: boolean;
constraint: PaletteEntryConstraint;
color?: QuantizedColor;
}
/**
* Configuration structure for palette extraction.
* @public
*/
export interface PaletteExtractionConfig {
saturationWeight: number;
luminosityWeight: number;
populationWeight: number;
volumeWeight: number;
constraints: PaletteEntryConstraint[];
}
/**
* The default configuration for palette extraction.
* @public
*/
export const defaultPaletteExtractionConfig: PaletteExtractionConfig = {
saturationWeight: 6,
luminosityWeight: 3,
populationWeight: 1,
volumeWeight: 0.1,
constraints: [
{
id: "Vibrant",
targetSaturation: 1,
minSaturation: 0.35,
maxSaturation: 1,
targetLuminosity: 0.5,
minLuminosity: 0.3,
maxLuminosity: 0.7,
},
{
id: "LightVibrant",
targetSaturation: 1,
minSaturation: 0.35,
maxSaturation: 1,
targetLuminosity: 0.74,
minLuminosity: 0.55,
maxLuminosity: 1,
},
{
id: "DarkVibrant",
targetSaturation: 1,
minSaturation: 0.35,
maxSaturation: 1,
targetLuminosity: 0.26,
minLuminosity: 0,
maxLuminosity: 0.45,
},
{
id: "Muted",
targetSaturation: 0.3,
minSaturation: 0,
maxSaturation: 0.4,
targetLuminosity: 0.5,
minLuminosity: 0.3,
maxLuminosity: 0.7,
},
{
id: "LightMuted",
targetSaturation: 0.3,
minSaturation: 0,
maxSaturation: 0.4,
targetLuminosity: 0.74,
minLuminosity: 0.55,
maxLuminosity: 1,
},
{
id: "DarkMuted",
targetSaturation: 0.3,
minSaturation: 0,
maxSaturation: 0.4,
targetLuminosity: 0.26,
minLuminosity: 0,
maxLuminosity: 0.45,
},
],
};
/**
* Extracts a palette.
* @param colors - the quantized colors
* @param config - the extraction config
* @public
*/
export function extractPalette(
colors: QuantizedColor[],
config: PaletteExtractionConfig = defaultPaletteExtractionConfig
): PaletteEntry[] {
Iif (config.constraints.length === 0) {
return [];
}
let totalPixelCount: number = 0;
let totalVolume: number = 0;
for (let i: number = 0; i < colors.length; i++) {
totalPixelCount += colors[i].pixelCount;
totalVolume += colors[i].colorVolume;
}
const retVal: PaletteEntry[] = new Array(config.constraints.length);
const bestFitValues: number[] = new Array(config.constraints.length);
for (let i: number = 0; i < retVal.length; i++) {
bestFitValues[i] = 0;
retVal[i] = {
found: false,
constraint: config.constraints[i],
};
}
const totalWeight: number =
config.saturationWeight +
config.luminosityWeight +
config.populationWeight +
config.volumeWeight;
for (let i: number = 0; i < colors.length; i++) {
const hsl: ColorHSL = rgbToHSL(colors[i].color);
for (let j: number = 0; j < config.constraints.length; j++) {
// Check for min and max saturation / luminosity
if (
hsl.s >= config.constraints[j].minSaturation &&
hsl.s <= config.constraints[j].maxSaturation &&
hsl.l >= config.constraints[j].minLuminosity &&
hsl.l <= config.constraints[j].maxLuminosity
) {
const populationFactor: number = colors[i].pixelCount / totalPixelCount;
const volumeFactor: number = colors[i].colorVolume / totalVolume;
const saturationFactor: number =
1 - Math.abs(hsl.s - config.constraints[j].targetSaturation);
const luminosityFactor: number =
1 - Math.abs(hsl.l - config.constraints[j].targetLuminosity);
const fitValue: number =
(populationFactor * config.populationWeight +
volumeFactor * config.volumeWeight +
saturationFactor * config.saturationWeight +
luminosityFactor * config.luminosityWeight) /
totalWeight;
if (fitValue > bestFitValues[j]) {
// Check if this color is already in use
let dupe: boolean = false;
for (let k: number = 0; k < j; k++) {
if (
retVal[k].found &&
retVal[k].color!.color.equalValue(colors[i].color)
) {
dupe = true;
break;
}
}
if (!dupe) {
bestFitValues[j] = fitValue;
retVal[j].found = true;
retVal[j].color = colors[i];
}
}
}
}
}
return retVal;
}
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