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improved out-of-gamut warning, taken from PhotoFlow

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This commit is contained in:
Alberto Griggio
2018-03-15 16:17:44 +01:00
parent 2f0fefb26f
commit 83521b0c92
3 changed files with 134 additions and 15 deletions
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50
rtengine/iplab2rgb.cc
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@@ -46,12 +46,28 @@ void ImProcFunctions::lab2monitorRgb (LabImage* lab, Image8* image)
int H = lab->H;
unsigned char * data = image->data;
const auto set_gamut_warning =
[](Image8 *image, int y, int x) -> void
{
image->r(y, x) = 0;
image->g(y, x) = 255;
image->b(y, x) = 255;
};
// cmsDoTransform is relatively expensive
#ifdef _OPENMP
#pragma omp parallel firstprivate(lab, data, W, H)
#endif
{
AlignedBuffer<float> pBuf(3 * lab->W);
AlignedBuffer<float> gwBuf1;
AlignedBuffer<float> gwBuf2;
if (gw_softproof2refTransform) {
gwBuf1.resize(3 * lab->W);
gwBuf2.resize(3 * lab->W);
}
float *buffer = pBuf.data;
#ifdef _OPENMP
@@ -74,6 +90,40 @@ void ImProcFunctions::lab2monitorRgb (LabImage* lab, Image8* image)
}
cmsDoTransform (monitorTransform, buffer, data + ix, W);
if (gw_softproof2refTransform) {
float delta_max = gw_lab2refTransform ? 0.0001f : 4.9999f;
cmsDoTransform(gw_lab2softproofTransform, buffer, gwBuf2.data, W);
cmsDoTransform(gw_softproof2refTransform, gwBuf2.data, gwBuf1.data, W);
float *proofdata = gwBuf1.data;
float *refdata = buffer;
if (gw_lab2refTransform) {
cmsDoTransform(gw_lab2refTransform, buffer, gwBuf2.data, W);
refdata = gwBuf2.data;
int iy = 0;
for (int j = 0; j < W; ++j) {
float delta = max(std::abs(proofdata[iy] - refdata[iy]), std::abs(proofdata[iy+1] - refdata[iy+1]), std::abs(proofdata[iy+2] - refdata[iy+2]));
iy += 3;
if (delta > delta_max) {
set_gamut_warning(image, i, j);
}
}
} else {
int iy = 0;
for (int j = 0; j < W; ++j) {
cmsCIELab lab1 = { proofdata[iy], proofdata[iy+1], proofdata[iy+2] };
cmsCIELab lab2 = { refdata[iy], refdata[iy+1], refdata[iy+2] };
iy += 3;
float delta = cmsDeltaE(&lab1, &lab2);
if (delta > delta_max) {
set_gamut_warning(image, i, j);
}
}
}
}
}
} // End of parallelization
} else {