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176 lines
6.7 KiB
Markdown
176 lines
6.7 KiB
Markdown
<!-- Generated by documentation.js. Update this documentation by updating the source code. -->
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## Sharp
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Constructor factory to create an instance of `sharp`, to which further methods are chained.
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JPEG, PNG, WebP, AVIF or TIFF format image data can be streamed out from this object.
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When using Stream based output, derived attributes are available from the `info` event.
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Non-critical problems encountered during processing are emitted as `warning` events.
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Implements the [stream.Duplex][1] class.
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### Parameters
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- `input` **([Buffer][2] \| [string][3])?** if present, can be
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a Buffer containing JPEG, PNG, WebP, AVIF, GIF, SVG, TIFF or raw pixel image data, or
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a String containing the filesystem path to an JPEG, PNG, WebP, AVIF, GIF, SVG or TIFF image file.
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JPEG, PNG, WebP, AVIF, GIF, SVG, TIFF or raw pixel image data can be streamed into the object when not present.
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- `options` **[Object][4]?** if present, is an Object with optional attributes.
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- `options.failOnError` **[boolean][5]** by default halt processing and raise an error when loading invalid images.
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Set this flag to `false` if you'd rather apply a "best effort" to decode images, even if the data is corrupt or invalid. (optional, default `true`)
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- `options.limitInputPixels` **([number][6] \| [boolean][5])** Do not process input images where the number of pixels
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(width x height) exceeds this limit. Assumes image dimensions contained in the input metadata can be trusted.
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An integral Number of pixels, zero or false to remove limit, true to use default limit of 268402689 (0x3FFF x 0x3FFF). (optional, default `268402689`)
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- `options.sequentialRead` **[boolean][5]** Set this to `true` to use sequential rather than random access where possible.
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This can reduce memory usage and might improve performance on some systems. (optional, default `false`)
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- `options.density` **[number][6]** number representing the DPI for vector images in the range 1 to 100000. (optional, default `72`)
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- `options.pages` **[number][6]** number of pages to extract for multi-page input (GIF, WebP, AVIF, TIFF, PDF), use -1 for all pages. (optional, default `1`)
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- `options.page` **[number][6]** page number to start extracting from for multi-page input (GIF, WebP, AVIF, TIFF, PDF), zero based. (optional, default `0`)
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- `options.level` **[number][6]** level to extract from a multi-level input (OpenSlide), zero based. (optional, default `0`)
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- `options.animated` **[boolean][5]** Set to `true` to read all frames/pages of an animated image (equivalent of setting `pages` to `-1`). (optional, default `false`)
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- `options.raw` **[Object][4]?** describes raw pixel input image data. See `raw()` for pixel ordering.
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- `options.raw.width` **[number][6]?**
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- `options.raw.height` **[number][6]?**
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- `options.raw.channels` **[number][6]?** 1-4
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- `options.create` **[Object][4]?** describes a new image to be created.
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- `options.create.width` **[number][6]?**
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- `options.create.height` **[number][6]?**
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- `options.create.channels` **[number][6]?** 3-4
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- `options.create.background` **([string][3] \| [Object][4])?** parsed by the [color][7] 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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```javascript
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// Convert an animated GIF to an animated WebP
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await sharp('in.gif', { animated: true }).toFile('out.webp');
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```
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- Throws **[Error][8]** Invalid parameters
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Returns **[Sharp][9]**
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## clone
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Take a "snapshot" of the Sharp instance, returning a new instance.
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Cloned instances inherit the input of their parent instance.
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This allows multiple output Streams and therefore multiple processing pipelines to share a single input Stream.
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### Examples
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```javascript
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const pipeline = sharp().rotate();
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pipeline.clone().resize(800, 600).pipe(firstWritableStream);
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pipeline.clone().extract({ left: 20, top: 20, width: 100, height: 100 }).pipe(secondWritableStream);
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readableStream.pipe(pipeline);
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// firstWritableStream receives auto-rotated, resized readableStream
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// secondWritableStream receives auto-rotated, extracted region of readableStream
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```
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```javascript
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// Create a pipeline that will download an image, resize it and format it to different files
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// Using Promises to know when the pipeline is complete
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const fs = require("fs");
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const got = require("got");
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const sharpStream = sharp({
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failOnError: false
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});
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const promises = [];
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promises.push(
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sharpStream
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.clone()
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.jpeg({ quality: 100 })
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.toFile("originalFile.jpg")
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);
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promises.push(
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sharpStream
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.clone()
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.resize({ width: 500 })
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.jpeg({ quality: 80 })
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.toFile("optimized-500.jpg")
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);
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promises.push(
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sharpStream
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.clone()
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.resize({ width: 500 })
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.webp({ quality: 80 })
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.toFile("optimized-500.webp")
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);
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// https://github.com/sindresorhus/got#gotstreamurl-options
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got.stream("https://www.example.com/some-file.jpg").pipe(sharpStream);
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Promise.all(promises)
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.then(res => { console.log("Done!", res); })
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.catch(err => {
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console.error("Error processing files, let's clean it up", err);
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try {
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fs.unlinkSync("originalFile.jpg");
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fs.unlinkSync("optimized-500.jpg");
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fs.unlinkSync("optimized-500.webp");
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} catch (e) {}
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});
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```
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Returns **[Sharp][9]**
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[1]: http://nodejs.org/api/stream.html#stream_class_stream_duplex
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[2]: https://nodejs.org/api/buffer.html
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[3]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
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[4]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
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[5]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
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[6]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
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[7]: https://www.npmjs.org/package/color
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[8]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error
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[9]: #sharp
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