fast-png
PNG image decoder and encoder written entirely in JavaScript.
Installation
$ npm install --save fast-png
Usage
decode(png[, options])
Arguments
png- A TypedArray or Buffer that contains the PNG data.options- An object of options
Options
checkCrc- If set totrue, the CRC will be checked for each chunk and an error will be thrown in case it's wrong (default: false).
encode(image)
Arguments
png- An object representing the image. You can pass an ImageData from the Canvas API or an object with the following properties:width- The width of the imageheight- The height of the imagedata- An array or TypedArray with the image datadepth- A number indicating the color depth (only 8 and 16 are supported now). Defaults to 8.channels- Number of channels, including alpha (1, 2, 3 and 4 are supported). Defaults to 4.
PNG standard
Spec can be found at: https://www.w3.org/TR/PNG/