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README.md

@jimp/plugin-threshold

Lightens an image.

This is useful as a simplified method for processing scanned drawings, signatures, etc

Usage

@param {number} options object
- max: A number auto limited between 0 - 255
- replace: (optional) A number auto limited between 0 - 255 (default 255)
- autoGreyscale: (optional) A boolean whether to apply greyscale beforehand (default true)
@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');

  image.threshold({ max: 150 });
  // or
  image.threshold({ max: 200, replace: 200, autoGreyscale: false });
}

main();