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kris 2021-11-02 22:14:59 +00:00
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precompute_conversion.py
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"""Precompute CIE2000 perceptual colour distance matrices. """Precompute CAM16-UCS colour tuples for all 2^24 RGB tuples.
XXX This 192MB data file is used to convert from RGB to CAM16-UCS colour space
The matrix of delta-E values is computed for all pairs of 24-bit RGB values, for purposes of computing (approximate) perceptual difference between pairs of
and Apple II target palette values. This is written out as a file that is colours when optimizing the image conversion (since this perceptual
mmapped at runtime for efficient access. For a 16-colour target palette this difference corresponds to the Euclidean distance in this colour space)
file is 256MB; for a 256-colour (NTSC) target palette it is 4GB.
""" """
import colour import colour