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https://github.com/KrisKennaway/ii-pix.git
synced 2024-06-08 06:29:31 +00:00
Actually use equal-sized palette splits. With the previous version
the first and last were smaller.
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30
convert.py
30
convert.py
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@ -65,20 +65,29 @@ class ClusterPalette:
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np.float32))
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return res
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def _palette_splits(self, palette_band_width=3):
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def _palette_splits(self, palette_height=35):
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# The 16 palettes are striped across consecutive (overlapping) line
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# ranges. The basic unit is 200/16 = 12.5 lines, but we extend the
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# line range to cover a multiple of this so that the palette ranges
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# overlap. Since nearby lines tend to have similar colours, this has
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# ranges. Since nearby lines tend to have similar colours, this has
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# the effect of smoothing out the colour transitions across palettes.
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# If we want to overlap 16 palettes in 200 lines, where each palette
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# has height H and overlaps the previous one by L lines, then the
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# boundaries are at lines:
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# (0, H), (H-L, 2H-L), (2H-2L, 3H-2L), ..., (15H-15L, 16H - 15L)
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# i.e. 16H - 15L = 200, sofor a given palette height H we need to
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# overlap by:
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# L = (16H - 200)/15
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palette_overlap = (16 * palette_height - 200) / 15
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palette_ranges = []
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for palette_idx in range(16):
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p_lower = max(palette_idx + 0.5 - (palette_band_width / 2), 0)
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p_upper = min(palette_idx + 0.5 + (palette_band_width / 2), 16)
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palette_ranges.append(
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(int(p_lower * (200 / 16)) * 320, int(p_upper * (200 / 16)) *
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320))
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palette_lower = int(
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palette_idx * (palette_height - palette_overlap))
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palette_upper = palette_lower + palette_height
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palette_ranges.append((palette_lower, palette_upper))
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assert palette_upper == 200
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# print(palette_ranges)
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return palette_ranges
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def propose_palettes(self) -> Tuple[np.ndarray, np.ndarray, List[float]]:
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@ -113,7 +122,8 @@ class ClusterPalette:
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for palette_idx in range(16):
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palette_lower, palette_upper = palette_splits[palette_idx]
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# TODO: dynamically tune palette cuts
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palette_pixels = self._colours_cam[palette_lower:palette_upper, :]
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palette_pixels = self._colours_cam[
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palette_lower * 320:palette_upper * 320, :]
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palettes_rgb12_iigs, palette_error = \
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dither_pyx.k_means_with_fixed_centroids(
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