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Thanks for the first open DNG converter!

I'm working on my own raw converter NOT based on dcraw. At the moment my converter supports only Canon CR2 files, but I think I have already some hints for you after a quick look at the source code:

- color matrix: you are using the color matrix from dcraw, dcraw is using only one color matrix and this matrix is a copy of one of the matrices of the Adobe DNG Converter. As described in the chapter "Mapping Camera Color Space to CIE XYZ Space" of the DNG specification two matrices could be used and as you are already using the Adobe matrices why not using them completely?

- camera calibration: Adobe calculates the color matrices with a reference cam. Every camera has a different calibration. The calibration matrix can be calculated by comparing the 5200K neutral white balance values from the reference cam against your 5200K values (the same values for both calibration matrices). (Only tested with Canon cams!)

bergi