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A couple days ago, I found a way to colour calibrate my Sigma DP2m files using the Gretag Macbeth chart.
Adobe DNG Profile editor is capable of profiling a Sigma DP2m DNG converted file, but ACR is not able to use it on the DNG or TIFF files, therefore it was a wasted effort.
Running Mac OSX, and not knowing how to do command line stuff in Terminal, and not having a PC around in sight, I felt rather stuck, as the solutions I found were Terminal based command line stuff or Windows executable files.
Stumbling across Wine for Mac, I quickly managed to run the Windows program called CoCa, which is a GUI for Agryll CMS if I'm not mistaken...
I photographed my Gretag Macbeth chart outside at midday, ran it through SPP with only camera settings applied (For colour images, the camera is always set to Daylight WB and Neutral colour mode) and saved it as a 16 bit Tiff file in Adobe RGB 1998 colour space.
I opened this file in PS, cropped the chart to fit the markings, and ran it through CoCa. I soon had an .icm profile which I saved in my colour profile library. I wrote a PS action which assigns the newly made profile to an image, and then converts it back to Adobe 98.
I actually created two icm. profiles. I found that the standard one had too saturated colours, so before saving the cropped colour chart image for profiling, I increased the saturation by 15, saved it, and proceeded to create an .icm profile. This tricked the resulting profile to render a less saturated image once assigned to the Sigma TIFF files.
Now, I'm no colour expert, and I suppose the method above has not much technical merit.... but the results have been fantastic. I'm far happier with the colour output from my DP2m since this calibration!
Here is a LINK to one of those slider comparisons with a before and after comparison. At the moment, I haven't got a suitable image that shows a more dramatic difference in colour