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Allow use of embed with 1 and 2 channel images #411

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Lovell Fuller
2016-04-14 21:39:17 +01:00
parent 1b7c5816fc
commit e0d58266be
5 changed files with 37 additions and 7 deletions
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20
src/pipeline.cc
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@@ -496,11 +496,21 @@ class PipelineWorker : public AsyncWorker {
// Scale up 8-bit values to match 16-bit input image
double multiplier = (image.interpretation() == VIPS_INTERPRETATION_RGB16) ? 256.0 : 1.0;
// Create background colour
std::vector<double> background {
baton->background[0] * multiplier,
baton->background[1] * multiplier,
baton->background[2] * multiplier
};
std::vector<double> background;
if (image.bands() > 2) {
background = {
multiplier * baton->background[0],
multiplier * baton->background[1],
multiplier * baton->background[2]
};
} else {
// Convert sRGB to greyscale
background = { multiplier * (
0.2126 * baton->background[0] +
0.7152 * baton->background[1] +
0.0722 * baton->background[2]
)};
}
// Add alpha channel to background colour
if (baton->background[3] < 255.0 || HasAlpha(image)) {
background.push_back(baton->background[3] * multiplier);