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Fix max text chunk error in PNG metadata #76

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Merged
georg-wolflein merged 1 commit into from
May 28, 2025
Merged

Fix max text chunk error in PNG metadata #76

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11 changes: 10 additions & 1 deletion src/stamp/preprocessing/tiling.py
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Original file line number Diff line number Diff line change
Expand Up @@ -158,7 +158,16 @@ def tiles_with_cache(
"w",
) as tile_zip_fp:
tile.image.save(
tile_zip_fp, format=EXTENSION_TO_FORMAT[cache_tiles_ext]
tile_zip_fp,
format=EXTENSION_TO_FORMAT[cache_tiles_ext],
**(
# Remove ICC profile for PNG images because that sometimes produces >1MB metadata,
# causing "ValueError: Decompressed data too large for PngImagePlugin.MAX_TEXT_CHUNK".
# Importantly, this does NOT affect the contents of np.array(tile.image).
dict(icc_profile=None)
if cache_tiles_ext == "png"
else {}
),
)

yield tile
Expand Down