Re: Luminosity Variance Between Perceptual and RelCol
Re: Luminosity Variance Between Perceptual and RelCol
- Subject: Re: Luminosity Variance Between Perceptual and RelCol
- From: email@hidden
- Date: Tue, 10 Jun 2003 08:11:26 EDT
In a message dated 6/10/03 4:32:28 AM, email@hidden writes:
>
Is there some logic behind this, or does it point to some procedural issue?
>
I would more expect modifications with a perceptual rendering to be more
>
related to color than to luminosity.
>
Monaco would be an interesting addition to your tests; I most often hear this
observation about their software.
If you choose color matches bases on some logic prioritizing hue or
saturation to some degree, then brightness or luminance is bound to be matched less
accurately, though the logic for it tending in one specific direction is less
obvious. With Monaco I believe it has do to with the automatic gamut compression
for Perceptual rendering lightening the image, while with ColorVision it may
have more to do with the relationship to the third (Saturation) intent, which
is part of the calculation process for the others; though I agree the
Perceptual to RelCol variation here is less than what I typically see with other
software. I won't speculate specificly on the Gretag Macbeth case, since I'm less
familiar with their software.
C. David Tobie
Design Cooperative
email@hidden
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