imagineer v0.3.3 Imagineer.Image.PNG.Filter.Basic.Average View Source
The Average filter computes value for a pixel based on the average between the pixel to its left and the pixel directly above it.
Link to this section Summary
Functions
Takes in the uncompressed binary for an average-filtered row of pixels, the unfiltered binary of the preceding row, and the number of bytes per pixel. It returns the a binary of the row as unfiltered pixel data
Link to this section Functions
Takes in the uncompressed binary for an average-filtered row of pixels, the unfiltered binary of the preceding row, and the number of bytes per pixel. It returns the a binary of the row as unfiltered pixel data.
For more information, see the PNG Filter documentation for the Average filter type .
Example
iex> filtered = <<13, 191, 74, 228, 149, 158>>
iex> prior_unfiltered_row = <<8, 215, 35, 113, 28, 112>>
iex> Imagineer.Image.PNG.Filter.Basic.Average.unfilter(filtered, prior_unfiltered_row, 3)
<<17, 42, 91, 37, 184, 3>>
iex> filtered = <<13, 191, 74, 228, 149, 158>>
iex> prior_unfiltered_row = <<8, 215, 35, 113, 28, 112>>
iex> Imagineer.Image.PNG.Filter.Basic.Average.unfilter(filtered, prior_unfiltered_row, 2)
<<17, 42, 100, 49, 213, 238>>