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autocrop-worker

v1.0.4

Published

A simple, fast autocrop library which automagically crops the image. The cropping related functions are based on autocrop.js. This library offloads image processing work from mainthread to workers using workerpool.

Downloads

32

Readme

autocrop-worker

npm license

A simple, fast autocrop library which automagically crops the image. The cropping related functions are based on autocrop.js https://github.com/lqez/autocrop.js. This library offloads image processing work from main thread to workers using workerpool.

Demo site: https://johnpremkumar.github.io/autocrop-worker/demo/

Install

$ npm install autocrop-worker

Usage

As ES6 Module with bundlers like webpack, etc.

import autocrop from 'autocrop-worker'
autocrop(<original_image_element>, (target_image_element), (options));

As legacy javascript files using script tags.

// workerpool need to be loaded before autocrop-worker.min.js
<script type="text/javascript" src="https://unpkg.com/[email protected]/dist/workerpool.min.js"></script>
<script type="text/javascript" src="https://unpkg.com/[email protected]/dist/autocrop-worker.min.js"></script>
...
<script>
autocrop(<original_image_element>, (target_image_element), (options));
</script>

If target_image_element is set null, it will replace original_image_element with the cropped result.

Parameter

const autoCropDefaultOptions = {
  bgColor: '#FFFFFF',       // Background color.
  alphaTolerance: 20,       // Pixels that are transparent than this value are considered transparent.
  colorTolerance: 20,       // Pixels similar to the background color are considered as the background.
  invertTolerance: 0.90,    // Invert the image if most of non-transparent pixels are background color.
  margin: '2%',             // Margin
  allowInvert: true,        // Allow invert if needed.
  marker: 'cropped',        // Add a marker attribute to prevent duplicated cropping.
  version: boolean|string   /* Defaults to current timestamp. Used for avoiding crossorigin taint issues due to previous cache.
                               Set it to false for dataURL and blobs */
};

Example

Example image of autocrop-worker.js

Used By

License

MIT