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Ensure premultiply op occurs before box shrink #605

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Lovell Fuller
2016-12-04 18:25:44 +00:00
parent 7231d92d1f
commit d3c78f825c
11 changed files with 42 additions and 33 deletions
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6
src/operations.cc
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@@ -300,6 +300,12 @@ namespace sharp {
Calculate the intensity of edges, skin tone and saturation
*/
double AttentionStrategy::operator()(VImage image) {
// Flatten RGBA onto a mid-grey background
if (image.bands() == 4 && HasAlpha(image)) {
double const midgrey = sharp::Is16Bit(image.interpretation()) ? 32768.0 : 128.0;
std::vector<double> background { midgrey, midgrey, midgrey };
image = image.flatten(VImage::option()->set("background", background));
}
// Convert to LAB colourspace
VImage lab = image.colourspace(VIPS_INTERPRETATION_LAB);
VImage l = lab[0];