There is already the Issue #2689 but i'd like to diskuss it a bit further. I found a wrongfully used color matrix in LeicaQ2 *.dng files. The reason is rather simple to understand,
when a new file is included in the dt database the both "Calibration Illuminant" and "Color Matrix" are read, the found matrix is saved in the database and it's marked as DT_COLORSPACE_EMBEDDED_MATRIX See exif.cc ~line 852, colorin.c line 1553 Some leica files have a Calibration Illuminant=23 (D50) instead of the assumed 21=D65 so the later color space conversions using the read-in "Color Matrix" makes a wrong assuption. I checked at raw.pixls and until now only three leica models are affected. There are some 'brute force' ways to fix it but this is my question: Is there a way to 'convert' a D50 color matrix into a D65 matrix? Or is this simply nonsense? Thanks for all help, suggestions and comments. Hanno ___________________________________________________________________________ darktable developer mailing list to unsubscribe send a mail to darktable-dev+unsubscr...@lists.darktable.org
