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Use 4-bit RGB values instead of 8-bit

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kris 2021-11-09 15:35:44 +00:00
parent a92c9cd7b5
commit 01b19a4a06
1 changed files with 7 additions and 4 deletions
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11
convert.py
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@ -26,18 +26,21 @@ def _to_pixel(float_array):
def cluster_palette(image: Image, rgb_to_cam16): def cluster_palette(image: Image, rgb_to_cam16):
# TODO: only 4-bit RGB colour channels
colours_rgb = np.asarray(image).reshape((-1, 3)) colours_rgb = np.asarray(image).reshape((-1, 3))
with colour.utilities.suppress_warnings(colour_usage_warnings=True): with colour.utilities.suppress_warnings(colour_usage_warnings=True):
colours_cam = colour.convert(colours_rgb / 255, "RGB", colours_cam = colour.convert(colours_rgb / 255, "RGB",
"CAM16UCS").astype(np.float32) "CAM16UCS").astype(np.float32)
kmeans = KMeans(n_clusters=16) kmeans = KMeans(n_clusters=16, max_iter=10000)
kmeans.fit_predict(colours_cam) kmeans.fit_predict(colours_cam)
palette_cam = kmeans.cluster_centers_ palette_cam = kmeans.cluster_centers_
with colour.utilities.suppress_warnings(colour_usage_warnings=True): with colour.utilities.suppress_warnings(colour_usage_warnings=True):
palette_rgb = colour.convert(palette_cam, "CAM16UCS", "RGB").astype( palette_rgb = colour.convert(palette_cam, "CAM16UCS", "RGB")
np.float32) # SHR colour palette only uses 4-bit values
# TODO: do this more carefully
palette_rgb = np.clip(np.round(palette_rgb * 16).astype(np.uint32) *
16, 0, 255)
palette_rgb = palette_rgb.astype(np.float32) / 255
return dither_pyx.dither_shr( return dither_pyx.dither_shr(
np.asarray(image).astype(np.float32) / 255, palette_rgb, rgb_to_cam16) np.asarray(image).astype(np.float32) / 255, palette_rgb, rgb_to_cam16)