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JavaScript GIF encoding library
Filed under images › 2d graphicsShow Allgif.js
JavaScript GIF encoder that runs in your browser.
Uses typed arrays and web workers to render each frame in the background, it's really fast!
Demo - http://jnordberg.github.io/gif.js/
Works in browsers supporting: Web Workers, File API and Typed Arrays
Usage
Include
gif.js
found indist/
in your page. Also make sure to havegif.worker.js
in the same location.var gif = new GIF({ workers: 2, quality: 10 }); // add an image element gif.addFrame(imageElement); // or a canvas element gif.addFrame(canvasElement, {delay: 200}); // or copy the pixels from a canvas context gif.addFrame(ctx, {copy: true}); gif.on('finished', function(blob) { window.open(URL.createObjectURL(blob)); }); gif.render();
Options
Options can be passed to the constructor or using the
setOptions
method.Name Default Description repeat 0
repeat count, -1
= no repeat,0
= foreverquality 10
pixel sample interval, lower is better workers 2
number of web workers to spawn workerScript gif.worker.js
url to load worker script from background #fff
background color where source image is transparent width null
output image width height null
output image height transparent null
transparent hex color, 0x00FF00
= greendither false
dithering method, e.g. FloydSteinberg-serpentine
debug false
whether to print debug information to console If width or height is
null
image size will be deteremined by first frame added.Available dithering methods are:
FloydSteinberg
FalseFloydSteinberg
Stucki
Atkinson
You can add
-serpentine
to use serpentine scanning, e.g.Stucki-serpentine
.addFrame options
Name Default Description delay 500
frame delay copy false
copy the pixel data dispose -1
frame disposal code. See GIF89a Spec Acknowledgements
gif.js is based on:
- Kevin Weiner's Animated gif encoder classes
- Neural-Net color quantization algorithm by Anthony Dekker
- Thibault Imbert's as3gif
Dithering code contributed by @PAEz and @panrafal
License
The MIT License (MIT)
Copyright (c) 2013 Johan Nordberg
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.