65 lines
1.9 KiB
Markdown
65 lines
1.9 KiB
Markdown
# Jimp ... in a browser
|
|
|
|
Browser support for Jimp was added by Phil Seaton. This enabled Jimp to be used in [Electron](http://electron.atom.io/) applications as well as web browsers.
|
|
|
|
Example usage:
|
|
|
|
```html
|
|
<script src="jimp.min.js"></script>
|
|
<script>
|
|
Jimp.read("lenna.png").then(function (lenna) {
|
|
lenna.resize(256, 256) // resize
|
|
.quality(60) // set JPEG quality
|
|
.greyscale() // set greyscale
|
|
.getBase64(Jimp.MIME_JPEG, function (err, src) {
|
|
var img = document.createElement("img");
|
|
img.setAttribute("src", src);
|
|
document.body.appendChild(img);
|
|
});
|
|
}).catch(function (err) {
|
|
console.error(err);
|
|
});
|
|
</script>
|
|
```
|
|
|
|
See the [main documentation](https://github.com/oliver-moran/jimp) for the full API documenatinon.
|
|
|
|
## WebWorkers
|
|
|
|
For better performance, it recommended that Jimp methods are run on a separate thread using [`WebWorkers`](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers). The following shows how using two files (`index.html` and `jimp-worker.js`):
|
|
|
|
```js
|
|
// index.html
|
|
|
|
var worker = new Worker('jimp-worker.js');
|
|
worker.onmessage = function(e) {
|
|
// append a new img element using the base 64 image
|
|
var img = document.createElement('img');
|
|
img.setAttribute('src', e.data);
|
|
document.body.appendChild(img);
|
|
};
|
|
worker.postMessage('lenna.png'); // message the worker thread
|
|
```
|
|
|
|
```js
|
|
// jimp-worker.js
|
|
|
|
importScripts('jimp.min.js');
|
|
|
|
self.addEventListener('message', function(e) {
|
|
Jimp.read(e.data).then(function(lenna) {
|
|
lenna
|
|
.resize(256, 256) // resize
|
|
.quality(60) // set JPEG quality
|
|
.greyscale() // set greyscale
|
|
.getBase64(Jimp.MIME_JPEG, function(err, src) {
|
|
self.postMessage(src); // message the main thread
|
|
});
|
|
});
|
|
});
|
|
```
|
|
|
|
## License
|
|
|
|
Jimp is licensed under the MIT license.
|