Luminosity Variance Between Perceptual and RelCol
Luminosity Variance Between Perceptual and RelCol
- Subject: Luminosity Variance Between Perceptual and RelCol
- From: Rick Gordon <email@hidden>
- Date: Tue, 10 Jun 2003 01:26:17 -0700
I have generated profiles for several Epson printers using both ProfileMaker 4.1.5 and ColorVision Profiler Pro 2.3. In both cases, there have been small differences in overall luminosity between a conversion to Perceptual mode and to Relative Colormetric mode. In the case of the ProfileMaker profiles there has been a tendency for the Perceptually rendered images to be slightly lighter than the RelCol-rendered images.With the the Profiler Pro profiles, the reverse has been true (and to a lesser extent). I've noticed this with RGB profiles for both packages and with CMYK profiles for ProfileMaker. This is without any profile editing, and the measuring instrument is an Eye One. The lightening appears irrespective of which perceptual rendering option is chosen (Paper Gray Axis, Preserve Gray Axis, Paper Gray Plus, or Preserve Gray Plus); the differences between them is more related to color.
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.
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RICK GORDON
EMERALD VALLEY GRAPHICS AND CONSULTING
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WWW:
http://www.shelterpub.com
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