imagemin-avifenc

AVIF encoding imagemin plugin using avifenc from AOMedia's libavif.

Install

$ npm install --save @vheemstra/imagemin-avifenc

Usage

import imagemin from 'imagemin';
import imageminAvifenc from '@vheemstra/imagemin-avifenc';

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

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

API

imageminAvifenc(options?)(buffer)

Returns a Promise<Buffer> with the converted image.

options

Type: object

For full option description, see avifenc's syntax method

jobs

Type: number or 'all' Default: 1

Number of jobs (worker threads). Use 'all' to use all available cores.

lossless

Type: boolean Default: false

Set all defaults to encode losslessly, and emit warnings when settings/input don't allow for it.

depth

Type: number Default: taken from input image

Output depth (8, 10 or 12).

min

Type: number Default: 0

Set min quantizer for color (0 to 63, where 0 is lossless).

max

Type: number Default: 10

Set max quantizer for color (0 to 63, where 0 is lossless).

minalpha

Type: number Default: 0

Set min quantizer for alpha (0 to 63, where 0 is lossless).

maxalpha

Type: number Default: 0

Set max quantizer for alpha (0 to 63, where 0 is lossless).

qcolor

Type: number

Set quality for color (0 to 100, where 100 is lossless).

qalpha

Type: number

Set quality for alpha (0 to 100, where 100 is lossless).

tilerowslog2

Type: number Default: 0

Set log2 of number of tile rows (0 to 6).

tilecolslog2

Type: number Default: 0

Set log2 of number of tile columns (0 to 6).

autotiling

Type: boolean

Set tilerowslog2 and tilecolslog2 automatically.

cicp

Type: array of numbers Default: null

Set CICP values (nclx colr box). Order of enums: avifColorPrimaries, avifTransferCharacteristics, avifMatrixCoefficients. Use 2 for any you wish to leave unspecified.

nclx

Synonym for cicp

premultiply

Type: boolean

Premultiply color by the alpha channel and signal this in the AVIF.

range

Type: string Default: full

YUV range (full or limited).

yuv

Type: number or 'auto' Default: 'auto'

Output format (444, 422, 420 or 400). For JPEG, auto honors the JPEG's internal format, if possible. For all other cases, auto defaults to 444

sharpyuv

Type: boolean

Use sharp RGB to YUV420 conversion (if supported). Ignored if output is not 420.

speed

Type: number or 'default' Default: 8

Encoder speed (slowest 0 to fastest 10). For codec internal defaults set to 'default'.

codec

Type: string Default: aom

AV1 codec to use, choose from:

• aom - version 2.0.0

exif

Type: string Default: null

Provide an absolute path to Exif metadata payload file to be associated with the primary item.

xmp

Type: string Default: null

Provide an absolute path to XMP metadata payload file to be associated with the primary item.

icc

Type: string Default: null

Provide an absolute path to ICC profile payload file to be associated with the primary item.

ignore-exif

Type: boolean Default: false

If the input file contains embedded Exif metadata, ignore it (no-op if absent).

ignore-xmp

Type: boolean Default: false

If the input file contains embedded XMP metadata, ignore it (no-op if absent).

ignore-icc

Type: boolean Default: false

If the input file contains an embedded ICC profile, ignore it (no-op if absent).

pasp

Type: array of 2 numbers Default: null

Set aspect ratio. Order: Horizontal spacing, Vertical spacing.

clap

Type: array of 8 numbers Default: null

Set clean aperture. Order: Width, Height, HOffset, VOffset (in num/denom pairs).

crop

Type: array of 4 numbers Default: null

Set clean aperture, but calculated from a crop rectangle. Order: X, Y, Width, Height.

irot

Type: number Default: null

Set rotation (0 to 3). Makes (90 * irot) degree rotation anti-clockwise. Default: no rotation.

imir

Type: number Default: null

Set mirroring (0 = vertical or 1 = horizontal). Default: no mirroring.

advanced

Type: object Default: null

Object containing codec-specific key/value pairs to pass directly to the codec. For aom these can be:

{
  'aq-mode': ...,              // Adaptive quantization mode (0: off (default), 1: variance, 2: complexity, 3: cyclic refresh)
  'cq-level': ...,             // Constant/Constrained Quality level (0-63, end-usage must be set to cq or q)
  'enable-chroma-deltaq': ..., // Enable delta quantization in chroma planes (0: disable (default), 1: enable)
  'end-usage': ...,            // Rate control mode (vbr, cbr, cq, or q)
  'sharpness': ...,            // Loop filter sharpness (0-7, default: 0)
  'tune': ...                  // Tune the encoder for distortion metric (psnr or ssim, default: psnr)
}

buffer

Type: Buffer

Buffer to optimize.

License

MIT © imagemin libavif © 2019 Joe Drago (Released under the BSD License.) This package is made by Philip van Heemstra Based on imagemin-jpegtran by Sindre Sorhus