Re: When to convert to working RGB
Re: When to convert to working RGB
- Subject: Re: When to convert to working RGB
- From: Roger Breton <email@hidden>
- Date: Wed, 19 Feb 2003 07:53:38 -0500
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I have been shooting a series of oil crayon drawings using a Betterlight 6K2
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scan back. I have profiled the scan back for the specific lighting set-up
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using a Colorchecker DC (which I reference myself using a Spectroscan) and
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ProfileMaker Pro 3.5.
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I find that after I scan the originals and apply the profile in PS 6.0 the
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images still require some degree of tonal correction, usually small
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adjustments to the black and white points. Generally, I would convert to my
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working RGB space (Adobe RGB 1998) before making the above mentioned tonal
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corrections; however, for this particular series of drawings, I am getting
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much better results (contrast and color) by making the basic tonal
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corrections while in the RGB space defined by the scan back's profile and
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THEN converting to my working RGB space for any other corrections that may
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be required.
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Does this defy conventional wisdom?
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Jim Morris
To me, what does defy "conventional wisdom" is the relative good success you
say you're having with the ColorChecker DC chart when every account I see of
its use on this List and elsewhere on the net is not as flattering. Have you
ever used it with other subjects than "oil crayon drawings"? But it sure is
a positive note anyway.
To address your basic question, I don't find anything wrong in the fact that
you're editing in the color space of your digital camera back. I've done
that many times and it worked fine for me.
I wonder whether Real-World Color Management cover that question?
Atany rate, without knowing more about your particular setup, it maybe a
function of the difference in AdobeRGB and ProfileMaker's Input profile: the
first is a based on a set of tone reproduction curves and a matrix of
colorants definition whereas the second is essentially a look-up table. It's
possible that the LUT type of profile allows a type of editing that is more
amenable to correct for contrast and color on your originals than AdobeRGB.
I'd be curious to see the kinds of results you're getting?
Roger Breton
Laval, Canada
email@hidden
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