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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
The matrix of delta-E values is computed for all pairs of 24-bit RGB values,
and Apple II target palette values. This is written out as a file that is
mmapped at runtime for efficient access. For a 16-colour target palette this
file is 256MB; for a 256-colour (NTSC) target palette it is 4GB.
This 192MB data file is used to convert from RGB to CAM16-UCS colour space
for purposes of computing (approximate) perceptual difference between pairs of
colours when optimizing the image conversion (since this perceptual
difference corresponds to the Euclidean distance in this colour space)
"""
import colour