imagemin-optipng

Imagemin plugin for OptiPNG

Install

$ npm install imagemin-optipng

Usage

const imagemin = require('imagemin');
const imageminOptipng = require('imagemin-optipng');

(async () => {
    await imagemin(['images/*.png'], 'build/images', {
        use: [
            imageminOptipng()
        ]
    });

    console.log('Images optimized!');
})();

API

imageminOptipng([options])(buffer)

Returns a Promise<Buffer>.

options

Type: object

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. 1 trial
  2. 8 trials
  3. 16 trials
  4. 24 trials
  5. 48 trials
  6. 120 trials
  7. 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.