Re: ColorChecker Digital SG question
Re: ColorChecker Digital SG question
- Subject: Re: ColorChecker Digital SG question
- From: Ben Goren <email@hidden>
- Date: Sun, 26 May 2013 06:40:34 -0700
On May 26, 2013, at 3:22 AM, Gerhard Fuernkranz <email@hidden> wrote:
> Whether or not the amount and distribution of the multiple white patches is sufficient in order to establish a sufficiently accurate model for the spatial relative intensity distribution across the extent of the image of the target is a different question...
Seems like a suboptimal tool for the job, especially when the right answer is so easy: make another exposure in the exact same setup with the chart replaced by a uniform white reference -- it could even be the back side of the chart or its cover or whatever if you're making your own chart -- and use that to normalize the scene illumination. You can do that in Photoshop, but Robin Myers's EquaLight does it better. If it's just for profiling, Iliah's RawDigger can do it when extracting patch values, but you'll still want EquaLight (or equivalent) for the same purpose when shooting the art.
You'd be much better off using those patches on the SG as normal patches, giving you that many more data points...and the patches would have been better designed to have sampled a larger portion of the color space -- either more saturated colors outside the existing gamut or more finely sampling the interior space of the gamut. Even a better distribution of neutral and near-neutral patches (such as what takes up most of the additional patches on the ColorChecker Passport) would be more useful; that's a very critical part of color space and oversampling it is a good idea.
b&
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