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import { extractColors } from 'extract-colors';
import { FinalColor } from 'extract-colors/lib/types/Color';
// Manages image color extraction
export class ExtractColors {
// loads all images into img elements
static loadImages = async (imageFiles: File[]): Promise<HTMLImageElement[]> => {
try {
const imageElements = await Promise.all(imageFiles.map(file => this.loadImage(file)));
return imageElements;
} catch (error) {
console.error(error);
return [];
}
};
// loads a single img into an img element
static loadImage = (file: File): Promise<HTMLImageElement> => {
return new Promise((resolve, reject) => {
const img = new Image();
img.onload = () => resolve(img);
img.onerror = error => reject(error);
const url = URL.createObjectURL(file);
img.src = url;
});
};
// loads all images into img elements
static loadImagesUrl = async (imageUrls: string[]): Promise<HTMLImageElement[]> => {
try {
const imageElements = await Promise.all(imageUrls.map(url => this.loadImageUrl(url)));
return imageElements;
} catch (error) {
console.error(error);
return [];
}
};
// loads a single img into an img element
static loadImageUrl = (url: string): Promise<HTMLImageElement> => {
return new Promise((resolve, reject) => {
const img = new Image();
img.onload = () => resolve(img);
img.onerror = error => reject(error);
img.src = url;
});
};
// extracts a list of collors from an img element
static getImgColors = async (img: HTMLImageElement) => {
const colors = await extractColors(img, { distance: 0.35 });
return colors;
};
static simpleSort = (colors: FinalColor[]): FinalColor[] => {
colors.sort((a, b) => {
if (a.hue !== b.hue) {
return b.hue - a.hue;
} else {
return b.saturation - a.saturation;
}
});
return colors;
};
static sortColors(colors: FinalColor[]): FinalColor[] {
// Convert color from RGB to CIELAB format
const convertToLab = (color: FinalColor): number[] => {
const r = color.red / 255;
const g = color.green / 255;
const b = color.blue / 255;
const x = r * 0.4124564 + g * 0.3575761 + b * 0.1804375;
const y = r * 0.2126729 + g * 0.7151522 + b * 0.072175;
const z = r * 0.0193339 + g * 0.119192 + b * 0.9503041;
const pivot = 0.008856;
const factor = 903.3;
const fx = x > pivot ? Math.cbrt(x) : (factor * x + 16) / 116;
const fy = y > pivot ? Math.cbrt(y) : (factor * y + 16) / 116;
const fz = z > pivot ? Math.cbrt(z) : (factor * z + 16) / 116;
const L = 116 * fy - 16;
const a = (fx - fy) * 500;
const b1 = (fy - fz) * 200;
return [L, a, b1];
};
// Sort colors using CIELAB distance for smooth transitions
colors.sort((colorA, colorB) => {
const labA = convertToLab(colorA);
const labB = convertToLab(colorB);
// Calculate Euclidean distance in CIELAB space
const distanceA = Math.sqrt(Math.pow(labA[0] - labB[0], 2) + Math.pow(labA[1] - labB[1], 2) + Math.pow(labA[2] - labB[2], 2));
const distanceB = Math.sqrt(Math.pow(labB[0] - labA[0], 2) + Math.pow(labB[1] - labA[1], 2) + Math.pow(labB[2] - labA[2], 2));
return distanceA - distanceB; // Sort by CIELAB distance
});
return colors;
}
static hexToFinalColor = (hex: string): FinalColor => {
const rgb = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
if (!rgb) {
throw new Error('Invalid hex color format.');
}
const red = parseInt(rgb[1], 16);
const green = parseInt(rgb[2], 16);
const blue = parseInt(rgb[3], 16);
const max = Math.max(red, green, blue);
const min = Math.min(red, green, blue);
const area = max - min;
const intensity = (max + min) / 2;
let hue = 0;
let saturation = 0;
let lightness = intensity;
if (area !== 0) {
saturation = area / (1 - Math.abs(2 * intensity - 1));
if (max === red) {
hue = (60 * ((green - blue) / area) + 360) % 360;
} else if (max === green) {
hue = (60 * ((blue - red) / area) + 120) % 360;
} else {
hue = (60 * ((red - green) / area) + 240) % 360;
}
}
return {
hex,
red,
green,
blue,
area,
hue,
saturation,
lightness,
intensity,
};
};
}
// for reference
// type FinalColor = {
// hex: string;
// red: number;
// green: number;
// blue: number;
// area: number;
// hue: number;
// saturation: number;
// lightness: number;
// intensity: number;
// }
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