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The aspect ratio of A4 paper is different from standard specifications. #95 #96

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The aspect ratio of A4 paper is different from standard specifications. #95 #96

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u-ashish Apr 22, 2026
74c9bec
fix: preserve aspect ratio in scale_to_fit grid quantization
asylee03 Apr 30, 2026
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5 changes: 4 additions & 1 deletion chandra/model/util.py
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Expand Up @@ -30,8 +30,11 @@ def scale_to_fit(
scale = (min_pixels / current_pixels) ** 0.5

# 2. Convert dimensions to integer "grid blocks"
# Derive h_blocks from rounded w_blocks to preserve aspect ratio.
# Independent rounding of both axes can push them in opposite directions
# (e.g. w rounds up, h rounds down), distorting the ratio.
w_blocks = max(1, round((width * scale) / grid_size))
h_blocks = max(1, round((height * scale) / grid_size))
h_blocks = max(1, round(w_blocks * (height / width)))

# 3. Refinement Loop: Ensure we are under the max limit
while (w_blocks * h_blocks * grid_size * grid_size) > max_pixels:
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