Re: DataColor SpyderCube
Re: DataColor SpyderCube
- Subject: Re: DataColor SpyderCube
- From: Andrew Rodney <email@hidden>
- Date: Thu, 19 Mar 2009 10:22:45 -0600
On Mar 19, 2009, at 8:55 AM, Robin Myers wrote:
My tests with fine art reproduction and using neutral balanced raw
capture show that the N8 patch you recommend on the ColorChecker is
not as good for neutral balancing as the N6.5 patch next to it.
Titanium dioxide, the white colorant used for the White patch, has a
falloff in reflectance in the deep blue to violet portion of the
spectrum which results in the camera "perceiving" the patch as
slightly yellow. The N8 patch next to the White patch still has too
much influence from the titanium dioxide and also exhibits a slight
yellow cast.
Interesting. I don't use a Macbeth for this task, and I don't want to
suggest its ideal, nor was it designed for this task. I usually find a
WB provides a "too cool" for my taste color appearance. I have used
the target to build custom DNG Profiles with the new editor and found
it works well.
Point is, Thomas used the Macbeth 2nd to white patch as a reference if
we can call it that and, it makes sense to me to use a spectrally
neutral target that's closer to white than middle gray. The
recommendations from the Adobe engineers is, WB using a non specular
white, not a middle gray card of which it appears, the SpyderCube is
provides. You can use a gray card but I'd be hard pressed, based on my
discussion with the engineers to say its ideal or best practices.
Andrew Rodney
http://www.digitaldog.net/
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