ExPng.Image.Filtering (ExPng v1.0.0)

This module contains code for filtering and defiltering lines of bytestring image data

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none()

paeth()

sub()

Passes a line of filtered pixel data through a filtering algorithm based on its filter type, and returns the unfiltered original data.

up()

filtered_line() :: {ExPng.filter(), binary()}

unfilter(
  filtered_line(),
  ExPng.bit_depth(),
  ExPng.maybe(filtered_line() | binary())
) :: binary()

Passes a line of filtered pixel data through a filtering algorithm based on its filter type, and returns the unfiltered original data.