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canvas-compress

v1.1.5

Published

image compress with canvas

Downloads

752

Readme

CanvasCompress

Compressing image with HTML5 canvas.

Browser Compatibility

| Browser | Version | | :------ | :-----: | | IE | 10+ | | Chrome | 22+ | | Firefox | 16+ | | Safari | 8+ | | Android Browser | 4+ | | Chrome for Android | 32+ | | iOS Safarri | 7+ |

Dependencies

  1. Exif.js
  2. ES6 Promise polyfill.

Install

Via npm:

npm install canvas-compress --save

Via bower:

bower install canvas-compress --save

Usage

    import CanvasCompress from 'canvas-compress';

    const compressor = new CanvasCompress({
        type: CanvasCompress.MIME.JPEG,
        width: 1000,
        height: 618,
        quality: 0.9,
    });

    compressor.process(fileBlob).then(({ source, result }) => {
        // const { blob, width, height } = source;
        const { blob, width, height } = result;
        ...
    });

Options

There're four optional properties for options object:

  • type: string: output type, default is image/jpeg

  • width: number: output width, default is 1000

  • height: number: ouput height, default is 618

  • quality: number: output quality, defalut is 0.9

Use third-party Promise

    CanvasCompress.usePromise(require('bluebird'));

Supported output MIME types

canvas-compress uses canvas.toDataUrl() method to convert canvas to binary. So the supported MIME types is:

  • 'image/png'
  • 'image/jpeg'
  • 'image/webp'

You can get MIME type via CanvasCompress.MIME, or use CanvasCompress.isSupportedType(MIMEtype: string) to check if it's a valid MIME type.

About alpha channel

Alpha channel is not available with MIME type image/jpeg, so when you are trying to turn an image into jpeg, you'll get a full white background(rgb(255, 255, 255)) instead of transparent black(rgba(0, 0, 0, 0)).

License

MIT.