diff options
Diffstat (limited to 'src/cmsio1.c')
| -rw-r--r-- | src/cmsio1.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/cmsio1.c b/src/cmsio1.c index 91cf06d..c367627 100644 --- a/src/cmsio1.c +++ b/src/cmsio1.c @@ -386,6 +386,27 @@ cmsPipeline* BuildRGBOutputMatrixShaper(cmsHPROFILE hProfile) return Lut; } + +// Change CLUT interpolation to trilinear +static +void ChangeInterpolationToTrilinear(cmsPipeline* Lut) +{ + cmsStage* Stage; + + for (Stage = cmsPipelineGetPtrToFirstStage(Lut); + Stage != NULL; + Stage = cmsStageNext(Stage)) { + + if (cmsStageType(Stage) == cmsSigCLutElemType) { + + _cmsStageCLutData* CLUT = (_cmsStageCLutData*) Stage ->Data; + + CLUT ->Params->dwFlags |= CMS_LERP_FLAGS_TRILINEAR; + _cmsSetInterpolationRoutine(CLUT ->Params); + } + } +} + // Create an output MPE LUT from agiven profile. Version mismatches are handled here cmsPipeline* _cmsReadOutputLUT(cmsHPROFILE hProfile, int Intent) { @@ -419,6 +440,12 @@ cmsPipeline* _cmsReadOutputLUT(cmsHPROFILE hProfile, int Intent) // The profile owns the Lut, so we need to copy it Lut = cmsPipelineDup(Lut); + // Now it is time for a controversial stuff. I found that for 3D LUTS using + // Lab used as indexer space, trilinear interpolation should be used + + if (cmsGetPCS(hProfile) == cmsSigLabData) + ChangeInterpolationToTrilinear(Lut); + // We need to adjust data only for Lab and Lut16 type if (OriginalType != cmsSigLut16Type || cmsGetPCS(hProfile) != cmsSigLabData) return Lut; |