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Add brightness, saturation and hue modulation #609 (#1601)

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This commit is contained in:
Jakub Michálek
2019-03-25 08:44:07 +01:00
committed by Lovell Fuller
parent 18afcf5f90
commit b494b2e872
28 changed files with 257 additions and 1 deletions
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15
src/operations.cc
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@@ -185,6 +185,21 @@ namespace sharp {
0.0, 0.0, 0.0, 1.0));
}
VImage Modulate(VImage image, double const brightness, double const saturation, int const hue) {
if (HasAlpha(image)) {
// Separate alpha channel
VImage alpha = image[image.bands() - 1];
return RemoveAlpha(image)
.colourspace(VIPS_INTERPRETATION_LCH)
.linear({brightness, saturation, 1}, {0, 0, static_cast<double>(hue)})
.bandjoin(alpha);
} else {
return image
.colourspace(VIPS_INTERPRETATION_LCH)
.linear({brightness, saturation, 1}, {0, 0, static_cast<double>(hue)});
}
}
/*
* Sharpen flat and jagged areas. Use sigma of -1.0 for fast sharpen.
*/