image-js/lib/compare/multiply.js

Image processing and manipulation in JavaScript

import { getOutputImage } from '../utils/getOutputImage.js';
import { validateChannels } from '../utils/validators/validators.js';
/**
 *
 * Multiplies points by a certain value.
 * @param image - image to which multiplication will be applied.
 * @param value - Value by which each pixel will be multiplied.
 * @param options - Multiply options
 * @returns image.
 */
export function multiply(image, value, options = {}) {
    const { channels = new Array(image.channels).fill(0).map((value, index) => index), } = options;
    validateChannels(channels, image);
    const newImage = getOutputImage(image, options, { clone: true });
    if (channels.length === 0) {
        return newImage;
    }
    for (const channel of channels) {
        for (let row = 0; row < newImage.height; row++) {
            for (let column = 0; column < newImage.width; column++) {
                const newIntensity = newImage.getValue(column, row, channel) * value;
                newImage.setClampedValue(column, row, channel, newIntensity);
            }
        }
    }
    return newImage;
}
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