Masks a source image on to this image using average pixel colour. A completely black pixel on the mask will turn a pixel in the image completely transparent.

Usage

• @param {Jimp} src the source Jimp instance
• @param {number} x the horizontal position to blit the image
• @param {number} y the vertical position to blit the image
• @param {function(Error, Jimp)} cb (optional) a callback for when complete

import jimp from 'jimp';

async function main() {
  const image = await jimp.read('test/image.png');
  const mask = await jimp.read('test/mask.png');

  image.mask(mask);
}