Re: Colorimetric Accuracy in the Field
Re: Colorimetric Accuracy in the Field
- Subject: Re: Colorimetric Accuracy in the Field
- From: Iliah Borg <email@hidden>
- Date: Wed, 05 Jun 2013 11:40:12 -0400
> Essential to creating a good profile is being able to get to the unprofiled data, including before white balancing and gamma and exposure correction and what-not as well as after but before anything else has been done. Until you can get to that kind of data (which you easily can with any of the ``alternative'' raw developers), the whole issue is rather moot.
>
> ...aaaaannnnnddd...I'm not aware of any profile-building tools that know about DNG. That is, anything that can extract RGB values from a photo of a chart, compare them with expected absolute color values, and output the matrix / LUT / whatever for the DNG. That's the heart and soul of profiling, when it comes right down to it. If you don't have that, whatever you're doing isn't color profiling. (Of course, there's the tool that ships with the ColorChecker Passport, but it only uses the 24 patches -- and the same deal with Adobe's DNG Profile Editor.)
I made such a tool for myself, it does all the above and even works over SG or spectral measurements. I've spent some serious time optimizing it. So I know the internal limitations of the dcp implementation.
--
Best regards,
Iliah Borg
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