image-js/lib/filters/blur.js

Image processing and manipulation in JavaScript

import { separableConvolution } from './convolution.js';
/**
 * Blur an image. The pixel in the center becomes an average of the surrounding ones.
 * @param image - Image to blur.
 * @param options - Blur options.
 * @returns The blurred image.
 */
export function blur(image, options) {
    const { width, height } = options;
    if (width < 1 || width % 2 === 0) {
        throw new RangeError(`Invalid property "width". Must be an odd number greater than 0. Received ${width}.`);
    }
    if (height < 1 || height % 2 === 0) {
        throw new RangeError(`Invalid property "height". Must be an odd number greater than 0. Received ${height}.`);
    }
    const kernelX = new Array(width).fill(1);
    const kernelY = new Array(height).fill(1);
    return separableConvolution(image, kernelX, kernelY, {
        normalize: true,
        ...options,
    });
}
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