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readme.md
imagemin-optipng
optipng image-min plugin
Install
$ npm install --save imagemin-optipng
Usage
const imagemin = require('imagemin');
const imageminOptipng = require('imagemin-optipng');
imagemin(['images/*.png'], 'build/images', {use: [imageminOptipng()]}).then(() => {
console.log('Images optimized');
});
API
imageminOptipng([options])(buffer)
Returns a Promise
for a Buffer
.
options
optimizationLevel
Type: number
Default: 3
Select an optimization level between 0
and 7
.
The optimization level 0 enables a set of optimization operations that require minimal effort. There will be no changes to image attributes like bit depth or color type, and no recompression of existing IDAT datastreams. The optimization level 1 enables a single IDAT compression trial. The trial chosen is what. OptiPNG thinks it’s probably the most effective. The optimization levels 2 and higher enable multiple IDAT compression trials; the higher the level, the more trials.
Level and trials:
- 1 trial
- 8 trials
- 16 trials
- 24 trials
- 48 trials
- 120 trials
- 240 trials
bitDepthReduction
Type: boolean
Default: true
Apply bit depth reduction.
colorTypeReduction
Type: boolean
Default: true
Apply color type reduction.
paletteReduction
Type: boolean
Default: true
Apply palette reduction.
buffer
Type: Buffer
Buffer to optimize.
License
MIT © imagemin