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handle colormaps correctly #4369

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merged 1 commit into from
Dec 15, 2024
Merged

handle colormaps correctly #4369

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32 changes: 13 additions & 19 deletions src/ccmain/thresholder.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -283,30 +283,24 @@ bool ImageThresholder::ThresholdToPix(Image *pix) {
tprintf("Image too large: (%d, %d)\n", image_width_, image_height_);
return false;
}
Image original = GetPixRect();
// Handle binary image
if (pix_channels_ == 0) {
// We have a binary image, but it still has to be copied, as this API
// allows the caller to modify the output.
Image original = GetPixRect();
*pix = original.copy();
} else {
if (pixGetColormap(original)) {
Image tmp;
Image without_cmap =
pixRemoveColormap(original, REMOVE_CMAP_BASED_ON_SRC);
int depth = pixGetDepth(without_cmap);
if (depth > 1 && depth < 8) {
tmp = pixConvertTo8(without_cmap, false);
} else {
tmp = without_cmap.copy();
}
without_cmap.destroy();
OtsuThresholdRectToPix(tmp, pix);
tmp.destroy();
} else {
OtsuThresholdRectToPix(pix_, pix);
}
original.destroy();
return true;
}
// Handle colormaps
Image src = pix_;
if (pixGetColormap(src)) {
src = pixRemoveColormap(src, REMOVE_CMAP_BASED_ON_SRC);
}
OtsuThresholdRectToPix(src, pix);
if (src != pix_) {
src.destroy();
}
original.destroy();
return true;
}

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