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 to true, 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 image
  • height - The height of the image
  • data - An array or TypedArray with the image data
  • depth - 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/

License

MIT