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This has NOTHING to do with color accuracy and everything to do with pleasing color. More info:
Everything you thought you wanted to know about DNG camera profiles:
All about In this 30 minute video, we’ll look into the creation and use of DNG camera profiles in three raw converters. The video covers:
What are DNG camera profiles, how do they differ from ICC camera profiles.
Misconceptions about DNG camera profiles.
Just when, and why do you need to build custom DNG camera profiles?
How to build custom DNG camera profiles using the X-rite Passport software.
The role of various illuminants on camera sensors and DNG camera profiles.
Dual Illuminant DNG camera profiles.
Examples of usage of DNG camera profiles in Lightroom, ACR, and Iridient Developer.
Low Rez (YouTube):
High Rez (download):
First of all I think you should drop the notion of "accurate" color out of the camera. There's no such thing. A photograph is always a remapping of reality, and if you're good at it, you can make a remapping that is credible and will be accepted as "accurate". That doesn't mean it's colorimetrically accurate, just that it's believable in its own right.
I have always gotten much better results with the Adobe Standard profile for my Nikons, than anything I was ever able to make with a ColorChecker and the DNG profile editor. After a while I just stopped trying.
The exception is if you have light sources that are not spectrally uniform, with spikes and troughs, such as fluorescent or LED. For this a custom profile usually helps a lot. But for daylight, flash or incandescent it's not worth the trouble.
Some of the profiles I made were overall not bad, but there were always "runaway" colors that just wouldn't behave, like blues that turned wildly oversaturated, greens that turned cyan, that sort of thing. The Adobe profiles seem very well controlled in this respect.
Thank you for your reply. I completely agree that the search for "perfect" color matching is somewhat sterile, and furthermore physiologically unfounded.
I generally like Adobe standard profile but, as I have seen advice about the "necessity" of custom profiles for a good output, I was curious about other informed opinions. Your comment confirms my own impression about this issue.
Thank you for links and for taking time to reply!