imagemin-mozjpeg-changba

Imagemin plugin for mozjpeg

Install

$ npm install imagemin-mozjpeg-changba

Usage

const imagemin = require('imagemin');
const imageminMozjpeg = require('imagemin-mozjpeg-changba');

(async () => {
  await imagemin(['images/*.jpg'], {
    destination: 'build/images',
    plugins: [
      imageminMozjpeg()
    ]
  });

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

API

imageminMozjpeg([options])(buffer)

Returns a Promise<Buffer>.

options

quality

Type: number

Compression quality, in range 0 (worst) to 100 (perfect).

progressive

Type: boolean Default: true

false creates baseline JPEG file.

targa

Type: boolean Default: false

Input file is Targa format (usually not needed).

revert

Type: boolean Default: false

Revert to standard defaults instead of mozjpeg defaults.

fastCrush

Type: boolean Default: false

Disable progressive scan optimization.

dcScanOpt

Type: number Default: 1

Set DC scan optimization mode.

• 0 One scan for all components
• 1 One scan per component
• 2 Optimize between one scan for all components and one scan for 1st component plus one scan for remaining components

trellis

Type: boolean Default: true

Trellis optimization.

trellisDC

Type: boolean Default: true

Trellis optimization of DC coefficients.

tune

Type: string Default: hvs-psnr

Set Trellis optimization method. Available methods: psnr, hvs-psnr, ssim, ms-ssim

overshoot

Type: boolean Default: true

Black-on-white deringing via overshoot.

arithmetic

Type: boolean Default: false

Use arithmetic coding.

dct

Type: string Default: int

Set DCT method:

• int Use integer DCT
• fast Use fast integer DCT (less accurate)
• float Use floating-point DCT

quantBaseline

Type: boolean Default: false

Use 8-bit quantization table entries for baseline JPEG compatibility.

quantTable

Type: number

Use predefined quantization table.

• 0 JPEG Annex K
• 1 Flat
• 2 Custom, tuned for MS-SSIM
• 3 ImageMagick table by N. Robidoux
• 4 Custom, tuned for PSNR-HVS
• 5 Table from paper by Klein, Silverstein and Carney

smooth

Type: number

Set the strength of smooth dithered input. (1...100)

maxMemory

Type: number

Set the maximum memory to use in kilobytes.

sample

Type: string[]

Set component sampling factors. Each item should be in the format HxV, for example 2x1.

buffer

Type: buffer

Buffer to optimize.

License

MIT © Imagemin