Originally Posted by Bruce in Philly
Sounds like a typical day at the office for me! []
To my eye, the custom white balance looks more accurate, while the auto white balance has a blue cast.
The reason for that is because about half of it is clipped highlights (in raw), so it's not possible to get an accurate white balance from it (though DPP doesn't warn you of this). The bottom right portion of the white card is not blown out, though, and if you compare that with the gray card, it's much more similar. The remaining difference is from the slight difference in angle (and therefore the type of light that is hitting them) as well as the spectral response of the material itself -- one or the other is probably more neutral.
Are you sure that is not because of your picture profile? Try changing it from "Standard" to "Neutral" and putting -1 or -2 on "Saturation". The "Standard" profile is not intended to be accurate -- I think it just fits what Canon thinks the majority of people want.
Well, I hope I was able to help explain some of those issues, but in the end it comes down to "accurate" vs "pleasing". If auto+tweaking gives you better results, I say go for it. All that matters is that you like the result.
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By the way, thank you for posting the raw file. It makes answering these types of posts so much easier and informative.
Kind regards,
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