Re: Gray Balance and Rip Linearization
Re: Gray Balance and Rip Linearization
- Subject: Re: Gray Balance and Rip Linearization
- From: Roger Breton <email@hidden>
- Date: Sun, 28 Nov 2004 22:40:30 -0500
Bertho,
> If a surface reflectance is compared to an absolute white reflectance standard
> and its absolute reflectance is 18%, for example, over the visible spectrum,
> would not that be defined as 18% gray?
Or any % of reflection would qualify as gray, you may say. OK. So that makes
for a third way of looking at gray, a spectral way.
> If yellow light is shined on it, it will look yellow and correspondingly for
> other colors.
Right. It will appear whathever color is shined on it. I agree.
> But the surface is still gray, regardless what it looks like to the brain.
OK. So let's call this a "physical" gray.
Now, how does that physical gray be used in tuning or judging an output
profile? You would look at the spectrum of the gray and as long as its
spectrally flat you would conclude that it is gray? And it ought to be gray
under all illuminants? I agree. Have you ever been able to achieve this
yourself? Or seen anything like it?
> Bertho
Regards,
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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