Apple-2-SW/ii-pix
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Optimize memory a bit

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kris 2021-11-02 21:25:00 +00:00
parent 4fbb0faf84
commit 0f1ec6f6f2
1 changed files with 6 additions and 3 deletions
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precompute_conversion.py
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@ -1,5 +1,6 @@
"""Precompute CIE2000 perceptual colour distance matrices.
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
@ -14,16 +15,18 @@ def main():
print("Precomputing conversion matrix from RGB to CAM16UCS colour space")
# Compute matrix of all 24-bit RGB values, normalized to 0..1 range
bits24 = np.arange(2 ** 24).reshape(-1, 1)
all_rgb = (np.concatenate(
bits24 = np.arange(2 ** 24, dtype=np.uint32).reshape(-1, 1)
all_rgb = np.concatenate(
[bits24 >> 16 & 0xff, bits24 >> 8 & 0xff, bits24 & 0xff],
axis=1) / 255).astype(np.float32)
axis=1).astype(np.float32) / 255
del bits24
with colour.utilities.suppress_warnings(colour_usage_warnings=True):
# Compute matrix of corresponding CAM16UCS colour values, indexed
# by 24-bit RGB value
all_cam16 = colour.convert(all_rgb, "RGB", "CAM16UCS").astype(
np.float32)
del all_rgb
np.save("data/rgb_to_cam16ucs.npy", all_cam16)