pyguymer3.image.makePngSrc.createStream¶

pyguymer3.image.makePngSrc.createStream(arrUint8, arrInt16, /, *, calcAdaptive: bool = True, calcAverage: bool = True, calcNone: bool = True, calcPaeth: bool = True, calcSub: bool = True, calcUp: bool = True, choices: str = 'all', debug: bool = True, levels: None | list[int] = None, memLevels: None | list[int] = None, strategies: None | list[int] = None, wbitss: None | list[int] = None) → bytearray[source]¶

Compress the PNG image data stream

This function loops over sets of settings and returns the smallest compressed PNG image data stream. See pyguymer3.image.makePng() for a discussion on how it does that.

Parameters:

arrUint8 (numpy.ndarray) – A “height * width * colour” unsigned 8-bit integer NumPy array.
arrInt16 (numpy.ndarray) – A signed 16-bit integer NumPy array copy of arrUint8.
calcAdaptive (bool, optional) – See pyguymer3.image.makePng() for the documentation.
calcAverage (bool, optional) – See pyguymer3.image.makePng() for the documentation.
calcNone (bool, optional) – See pyguymer3.image.makePng() for the documentation.
calcPaeth (bool, optional) – See pyguymer3.image.makePng() for the documentation.
calcSub (bool, optional) – See pyguymer3.image.makePng() for the documentation.
calcUp (bool, optional) – See pyguymer3.image.makePng() for the documentation.
choices (str, optional) – See pyguymer3.image.makePng() for the documentation.
debug (bool, optional) – Print debug messages.
levels (None or list of int, optional) – See pyguymer3.image.makePng() for the documentation.
memLevels (None or list of int, optional) – See pyguymer3.image.makePng() for the documentation.
strategies (None or list of int, optional) – See pyguymer3.image.makePng() for the documentation.
wbitss (None or list of int, optional) – See pyguymer3.image.makePng() for the documentation.

Returns:

stream – The compressed PNG image data stream.

Return type:

bytearray

Notes

References