sharp

2019-03-15 admin

sharp是什么

什么是sharp,High performance Node.js image processing, the fastest module to resize JPEG, PNG, WebP and TIFF images

sharp使用教程帮助文档

sharp

sharp logo

npm install sharp
yarn add sharp

The typical use case for this high speed Node.js module is to convert large images in common formats to smaller, web-friendly JPEG, PNG and WebP images of varying dimensions.

Resizing an image is typically 4x-5x faster than using the quickest ImageMagick and GraphicsMagick settings.

Colour spaces, embedded ICC profiles and alpha transparency channels are all handled correctly. Lanczos resampling ensures quality is not sacrificed for speed.

As well as image resizing, operations such as rotation, extraction, compositing and gamma correction are available.

Most modern 64-bit OS X, Windows and Linux systems running Node versions 6, 8, 10 and 11 do not require any additional install or runtime dependencies.

Examples

const sharp = require('sharp');
sharp(inputBuffer)
  .resize(320, 240)
  .toFile('output.webp', (err, info) => ... );
  // A Promises/A+ promise is returned when callback is not provided.
sharp('input.jpg')
  .rotate()
  .resize(200)
  .toBuffer()
  .then( data => ... )
  .catch( err => ... );
const roundedCorners = Buffer.from(
  '<svg><rect x="0" y="0" width="200" height="200" rx="50" ry="50"/></svg>'
);

const roundedCornerResizer =
  sharp()
    .resize(200, 200)
    .overlayWith(roundedCorners, { cutout: true })
    .png();

readableStream
  .pipe(roundedCornerResizer)
  .pipe(writableStream);

Test Coverage

Documentation

Visit sharp.pixelplumbing.com for complete installation instructions, API documentation, benchmark tests and changelog.

Contributing

A guide for contributors covers reporting bugs, requesting features and submitting code changes.

Licensing

Copyright 2013, 2014, 2015, 2016, 2017, 2018, 2019 Lovell Fuller and contributors.

Licensed under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

本站文章除注明转载外,均为本站原创或编译。欢迎任何形式的转载,但请务必注明出处。

转载请注明:文章转载自 JavaScript中文网 [https://www.javascriptcn.com]

本文地址:https://www.javascriptcn.com/read-57758.html

文章标题:sharp

回到顶部