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Ensure greyscale images can be trimmed #3386

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Lovell Fuller
2022-09-26 10:15:25 +01:00
parent 70e6bb0162
commit d1004eed02
3 changed files with 39 additions and 7 deletions
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17
src/operations.cc
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@@ -289,17 +289,20 @@ namespace sharp {
background = image.extract_area(0, 0, 1, 1)(0, 0);
multiplier = 1.0;
}
if (background.size() == 4) {
if (HasAlpha(image) && background.size() == 4) {
// Just discard the alpha because flattening the background colour with
// itself (effectively what find_trim() does) gives the same result
backgroundAlpha[0] = background[3] * multiplier;
}
background = {
background[0] * multiplier,
background[1] * multiplier,
background[2] * multiplier
};
if (image.bands() > 2) {
background = {
background[0] * multiplier,
background[1] * multiplier,
background[2] * multiplier
};
} else {
background[0] = background[0] * multiplier;
}
int left, top, width, height;
left = image.find_trim(&top, &width, &height, VImage::option()
->set("background", background)