png-crop
v0.0.2
Published
Small PNG cropping utility, written in pure JS for Node.
Downloads
12,765
Readme
PNG Crop
Small PNG crop utility, written in pure JS for Node.
npm install png-crop
Usage
(Check out the example folder.)
Both methods take a image path/stream/buffer as input, and a configuration with the keys width
, height
(mandatory, can be arbitrarily large) and top
and left
(optional).
Crop and output to file
var PNGCrop = require('png-crop');
// if you don't know the image's dimension and want to crop for a point all the
// way til bottom right, just pass a big width/height
var config1 = {width: 100, height: 62, top: 95, left: 110};
// pass a path, a buffer or a stream as the input
PNGCrop.crop('1.png', 'expectedCropTopLeftConfig.png', config1, function(err) {
if (err) throw err;
console.log('done!');
});
Crop and get the output stream
var PNGCrop = require('png-crop');
// optionally pass top and left to the configurations as the upper left corner
// from which to start cropping
var config2 = {width: 53, height: 114};
var imgBuffer = fs.readFileSync('1.png');
PNGCrop.cropToStream(imgBuffer, config2, function(err, outputStream) {
if (err) throw err;
outputStream.pipe(fs.createWriteStream('expectedCrop.png'));
});
License
MIT.