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A small, fast and advanced PNG / APNG encoder and decoder. It is the main PNG engine for Photopea image editor.
Download and include the UPNG.js
file in your code, or get it from NPM:
npm install upng-js
UPNG.js supports APNG and the interface expects "frames". Regular PNG is just a single-frame animation (single-item array).
UPNG.encode(imgs, w, h, cnum, [dels])
imgs
: array of frames. A frame is an ArrayBuffer containing the pixel data (RGBA, 8 bits per channel)w
, h
: width and height of the imagecnum
: number of colors in the result; 0: all colors (lossless PNG)dels
: array of delays for each frame (only when 2 or more frames)UPNG.js can do a lossy minification of PNG files, similar to TinyPNG and other tools. It performs color quantization using the k-means algorithm.
Lossy compression is allowed by the last parameter cnum
. Set it to zero for a lossless compression, or write the number of allowed colors in the image. Smaller values produce smaller files. Or just use 0 for lossless / 256 for lossy.
Supports all color types (including Grayscale and Palettes), all channel depths (1, 2, 4, 8, 16), interlaced images etc. Opens PNGs which other libraries can not open (tested with PngSuite).
UPNG.decode(buffer)
buffer
: ArrayBuffer containing the PNG filewidth
: the width of the imageheight
: the height of the imagedepth
: number of bits per channelctype
: color type of the file (Truecolor, Grayscale, Palette ...)frames
: additional info about frames (frame delays etc.)tabs
: additional chunks of the PNG filedata
: pixel data of the imagePNG files may have a various number of channels and a various color depth. The interpretation of data
depends on the current color type and color depth (see the PNG specification).
UPNG.toRGBA8(img)
img
: PNG image object (returned by UPNG.decode())var img = UPNG.decode(buff); // put ArrayBuffer of the PNG file into UPNG.decode
var rgba = UPNG.toRGBA8(img)[0]; // UPNG.toRGBA8 returns array of frames, size: width * height * 4 bytes.
PNG format uses the Inflate algorithm. Right now, UPNG.js calls Pako.js for the Inflate and Deflate method.
FAQs
Small, fast and advanced PNG / APNG encoder and decoder
We found that upng-js demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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