image-js/lib/utils/getMinMax.js

Image processing and manipulation in JavaScript

/**
 * Find the min and max values of each channel of the image.
 * @param image - Image to process.
 * @returns An object with arrays of the min and max values.
 */
export function getMinMax(image) {
    const min = new Array(image.channels).fill(image.maxValue);
    const max = new Array(image.channels).fill(0);
    for (let row = 0; row < image.height; row++) {
        for (let column = 0; column < image.width; column++) {
            for (let channel = 0; channel < image.channels; channel++) {
                const currentValue = image.getValue(column, row, channel);
                if (currentValue < min[channel]) {
                    min[channel] = currentValue;
                }
                if (currentValue > max[channel]) {
                    max[channel] = currentValue;
                }
            }
        }
    }
    return { min, max };
}
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