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122 lines
3.8 KiB
Markdown
122 lines
3.8 KiB
Markdown
<!-- Generated by documentation.js. Update this documentation by updating the source code. -->
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## Sharp
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### Parameters
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- `input` **([Buffer][1] \| [String][2])?** if present, can be
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a Buffer containing JPEG, PNG, WebP, GIF, SVG, TIFF or raw pixel image data, or
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a String containing the path to an JPEG, PNG, WebP, GIF, SVG or TIFF image file.
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JPEG, PNG, WebP, GIF, SVG, TIFF or raw pixel image data can be streamed into the object when not present.
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- `options` **[Object][3]?** if present, is an Object with optional attributes.
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- `options.failOnError` **[Boolean][4]** by default apply a "best effort"
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to decode images, even if the data is corrupt or invalid. Set this flag to true
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if you'd rather halt processing and raise an error when loading invalid images. (optional, default `false`)
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- `options.density` **[Number][5]** number representing the DPI for vector images. (optional, default `72`)
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- `options.page` **[Number][5]** page number to extract for multi-page input (GIF, TIFF) (optional, default `0`)
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- `options.raw` **[Object][3]?** describes raw pixel input image data. See `raw()` for pixel ordering.
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- `options.raw.width` **[Number][5]?**
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- `options.raw.height` **[Number][5]?**
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- `options.raw.channels` **[Number][5]?** 1-4
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- `options.create` **[Object][3]?** describes a new image to be created.
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- `options.create.width` **[Number][5]?**
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- `options.create.height` **[Number][5]?**
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- `options.create.channels` **[Number][5]?** 3-4
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- `options.create.background` **([String][2] \| [Object][3])?** parsed by the [color][6] module to extract values for red, green, blue and alpha.
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### Examples
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```javascript
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sharp('input.jpg')
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.resize(300, 200)
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.toFile('output.jpg', function(err) {
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// output.jpg is a 300 pixels wide and 200 pixels high image
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// containing a scaled and cropped version of input.jpg
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});
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```
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```javascript
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// Read image data from readableStream,
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// resize to 300 pixels wide,
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// emit an 'info' event with calculated dimensions
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// and finally write image data to writableStream
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var transformer = sharp()
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.resize(300)
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.on('info', function(info) {
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console.log('Image height is ' + info.height);
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});
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readableStream.pipe(transformer).pipe(writableStream);
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```
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```javascript
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// Create a blank 300x200 PNG image of semi-transluent red pixels
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sharp({
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create: {
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width: 300,
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height: 200,
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channels: 4,
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background: { r: 255, g: 0, b: 0, alpha: 0.5 }
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}
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})
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.png()
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.toBuffer()
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.then( ... );
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```
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- Throws **[Error][7]** Invalid parameters
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Returns **[Sharp][8]**
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### format
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An Object containing nested boolean values representing the available input and output formats/methods.
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#### Examples
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```javascript
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console.log(sharp.format);
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```
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Returns **[Object][3]**
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### versions
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An Object containing the version numbers of libvips and its dependencies.
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#### Examples
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```javascript
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console.log(sharp.versions);
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```
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## queue
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An EventEmitter that emits a `change` event when a task is either:
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- queued, waiting for _libuv_ to provide a worker thread
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- complete
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### Examples
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```javascript
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sharp.queue.on('change', function(queueLength) {
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console.log('Queue contains ' + queueLength + ' task(s)');
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});
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```
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[1]: https://nodejs.org/api/buffer.html
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[2]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
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[3]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
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[4]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
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[5]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
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[6]: https://www.npmjs.org/package/color
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[7]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error
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[8]: #sharp
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