Fix a bug on CMYK gamut check when using float Lab as input space.

For what it seems, it has been there for many years.
mm2 · Nov 10, 2024 · 676e803 · 676e803 · MonkeybreadSoftware · Nov 10, 2024
1 parent 70a39bf
commit 676e803
Showing 1 changed file with 6 additions and 3 deletions.
diff --git a/src/cmsgmt.c b/src/cmsgmt.c
@@ -298,8 +298,9 @@ cmsPipeline* _cmsCreateGamutCheckPipeline(cmsContext ContextID,
     cmsUInt32Number dwFormat;
     GAMUTCHAIN Chain;
     cmsUInt32Number nGridpoints;
-    cmsInt32Number nChannels;
+    cmsInt32Number nChannels, nInputChannels;
     cmsColorSpaceSignature ColorSpace;
+    cmsColorSpaceSignature InputColorSpace;
     cmsUInt32Number i;
     cmsHPROFILE ProfileList[256];
     cmsBool     BPCList[256];
@@ -345,11 +346,13 @@ cmsPipeline* _cmsCreateGamutCheckPipeline(cmsContext ContextID,
     AdaptationList[nGamutPCSposition] = 1.0;
     IntentList[nGamutPCSposition] = INTENT_RELATIVE_COLORIMETRIC;
 
-
     ColorSpace  = cmsGetColorSpace(hGamut);
     nChannels   = cmsChannelsOfColorSpace(ColorSpace);
     nGridpoints = _cmsReasonableGridpointsByColorspace(ColorSpace, cmsFLAGS_HIGHRESPRECALC);
-    dwFormat    = (CHANNELS_SH(nChannels)|BYTES_SH(2));
+
+    InputColorSpace = cmsGetColorSpace(ProfileList[0]);
+    nInputChannels  = cmsChannelsOfColorSpace(InputColorSpace);
+    dwFormat        = (CHANNELS_SH(nInputChannels)|BYTES_SH(2));
 
     // 16 bits to Lab double
     Chain.hInput = cmsCreateExtendedTransform(ContextID,