sharp

sharp

adj

1. clearly defined; distinct: a sharp photographic image.
2. quick, brisk, or spirited.
3. shrewd or astute: a sharp bargainer.
4. (Informal.) very stylish: a sharp dresser; a sharp jacket.

The typical use case for this high performance Node.js module is to convert a large JPEG image to smaller JPEG images of varying dimensions.

It is somewhat opinionated in that it only deals with JPEG images, always obeys the requested dimensions by either cropping or embedding and insists on a mild sharpen of the resulting image.

Under the hood you'll find the blazingly fast libvips image processing library, originally created in 1989 at Birkbeck College and currently maintained by the University of Southampton. Speed is typically 25-30% faster than the imagemagick equivalent.

Prerequisites

Requires node-gyp and libvips-dev to build.

sudo npm install -g node-gyp
sudo apt-get install libvips-dev

Requires vips-7.xx.pc (installed with libvips-dev) to be symlinked as /usr/lib/pkgconfig/vips.pc

Ubuntu 12.04 LTS:

sudo ln -s /usr/lib/pkgconfig/vips-7.26.pc /usr/lib/pkgconfig/vips.pc

Ubuntu 13.04:

sudo ln -s /usr/lib/x86_64-linux-gnu/pkgconfig/vips-7.28.pc /usr/lib/pkgconfig/vips.pc

Install

npm install sharp

Usage

var sharp = require("sharp");
sharp.crop("input.jpg", "output.jpg", 300, 200, function(err) {
  if (err) {
    throw err;
  }
  // output.jpg is cropped input.jpg
});
sharp.embedWhite("input.jpg", "output.jpg", 200, 300, function(err) {
  if (err) {
    throw err;
  }
  // output.jpg contains input.jpg embedded with a white border
});
sharp.embedBlack("input.jpg", "output.jpg", 200, 300, function(err) {
  if (err) {
    throw err;
  }
  // output.jpg contains input.jpg embedded with a black border
});

Testing

npm test