pyguymer3.image.returnPngInfo

pyguymer3.image.returnPngInfo(pName, /, *, debug=True)[source]

Return information about a PNG

This function returns information, such as filter type and compression method, about a PNG.

Parameters:

  • pName (str) – The input PNG.

  • debug (bool, optional) – Print debug messages.

Returns:

  • nx (int) – The width of the input PNG.

  • ny (int) – The height of the input PNG.

  • ct (str) – The colour type of the input PNG (as defined in the PNG specification [2]).

  • ft (str) – The filter type of the input PNG (as defined in the PNG specification [2])

  • wbits (int) – The compression window size of the input PNG (as defined in the ZLIB compressed data format specification [3]).

  • fdict (bool) – Whether the compressor was preconditioned with data.

  • flevel (str) – The compression level of the input PNG (as defined in the ZLIB compressed data format specification [3]).

Notes

This function only supports 8-bit images (either greyscale, paletted or truecolour), without interlacing.

Copyright 2017 Thomas Guymer [1]

References