image-js/lib/featureMatching/utils/getColors.js

Image processing and manipulation in JavaScript

import { getClampFromTo } from '../../utils/clamp.js';
/**
 * Generate an array of colors to draw the keypoints depending on their score or the matches depending on the distance.
 * @param image - The source image.
 * @param baseColor - The desired shade for the colors.
 * @param options - Get score colors options.
 * @returns Array of colors.
 */
export function getColors(image, baseColor, options = {}) {
    const { nbShades = 6, minValueFactor = 0.2 } = options;
    const maxValue = Math.max(...baseColor);
    const minValue = maxValue * minValueFactor;
    const interval = Math.floor((maxValue - minValue) / (nbShades - 1));
    const clamp = getClampFromTo(0, image.maxValue);
    const colors = [];
    for (let i = 0; i < nbShades; i++) {
        const color = [];
        for (const channel of baseColor) {
            color.push(clamp(channel - i * interval));
        }
        colors.push(color);
    }
    return colors;
}
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