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fix casting of offset to float which breaks indexing #1

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fix casting of offset to float which breaks indexing #1

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2 changes: 1 addition & 1 deletion error_diffusion.py
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Original file line number Diff line number Diff line change
Expand Up @@ -82,7 +82,7 @@ def _error_diffusion(image_matrix, palette_name, diffusion_matrix):
new_matrix[x + (ci + 1)][y] += quant_error * coeff
for di, downward_diffusion in enumerate(diffusion_matrix[1:]):
if y + di + 1 < rows:
offset = len(downward_diffusion) / 2
offset = int(len(downward_diffusion) / 2)
for ci, coeff in enumerate(downward_diffusion):
if 0 <= x + ci - offset < cols:
new_matrix[x + ci - offset][y + di + 1] += quant_error * coeff
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