Hi Mark, I see. The formatter selection code does revert your types to the generic formatter instead of using the Lab template. As a result Lab space is encoded in range 0..1.0 instead of 0..100, -127...+128.
Ok, it may be regarded as a bug, and I have it already fixed. Will commit the changes on git probably on monday, as right now the server where I keep the sandbox is down. Thanks for reporting. Marti Quoting Mark <[email protected]>: > Hi, > > I'd like to use 16 byte float pixels for RGA, Lab and XYZ conversions > - so I tried defining these: > > #define TYPE_XYZA_FLT > (FLOAT_SH(1)|COLORSPACE_SH(PT_XYZ)|EXTRA_SH(1)|CHANNELS_SH(3)|BYTES_SH(4)) > #define TYPE_LabA_FLT > (FLOAT_SH(1)|COLORSPACE_SH(PT_Lab)|EXTRA_SH(1)|CHANNELS_SH(3)|BYTES_SH(4)) > #define TYPE_RGBA_FLT > (FLOAT_SH(1)|COLORSPACE_SH(PT_RGB)|EXTRA_SH(1)|CHANNELS_SH(3)|BYTES_SH(4)) > > But it looks like something is wrong. > > Using the LCMS built in formats (TYPE_RGB_FLT, TYPE_XYZ_FLT, > TYPE_Lab_FLT) I get the following: > > sRGB -> XYZ -> sRGB > 1.000000, 1.000000, 1.000000 > 0.964200, 1.000000, 0.824900 > 1.000000, 1.000000, 1.000000 > > sRGB -> Lab -> sRGB > 1.000000, 1.000000, 1.000000 > 100.000000, 0.000008, -0.000008 > 1.000000, 1.000000, 1.000000 > > Lab -> XYZ -> Lab > 100.000000, 0.000000, 0.000000 > 0.964200, 1.000000, 0.824900 > 100.000000, 0.000008, 0.000008 > > > Using the formats I defined (TYPE_XYZA_FLT, TYPE_LabA_FLT, TYPE_RGBA_FLT): > > sRGB -> XYZ -> sRGB > 1.000000, 1.000000, 1.000000, 0.000000 > 0.482107, 0.500008, 0.412456, 0.000000 > 1.000000, 1.000000, 1.000000, 0.000000 > > sRGB -> Lab -> sRGB > 1.000000, 1.000000, 1.000000, 0.000000 > 1.000000, 0.501961, 0.501961, 0.000000 > 1.000000, 1.000000, 1.000000, 0.000000 > > Lab -> XYZ -> Lab > 100.000000, 0.000000, 0.000000, 0.000000 > 307598.437500, 321873.781250, 271461.625000, 0.000000 > 100.000000, -0.000001, 0.000000, 0.000000 > > Any ideas what I'm doing wrong? > > Thanks > Mark > > > ------------------------------------------------------------------------------ _______________________________________________ Lcms-user mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/lcms-user
