• Open Menu Close Menu
  • Apple
  • Shopping Bag
  • Apple
  • Mac
  • iPad
  • iPhone
  • Watch
  • TV
  • Music
  • Support
  • Search apple.com
  • Shopping Bag

Lists

Open Menu Close Menu
  • Terms and Conditions
  • Lists hosted on this site
  • Email the Postmaster
  • Tips for posting to public mailing lists
Luminosity Variance Between Perceptual and RelCol
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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.
--

___________________________________________________

RICK GORDON
EMERALD VALLEY GRAPHICS AND CONSULTING
___________________________________________________

WWW: http://www.shelterpub.com
_______________________________________________
colorsync-users mailing list | email@hidden
Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/colorsync-users
Do not post admin requests to the list. They will be ignored.

  • Prev by Date: Re: Monitor Calibration with True Color System
  • Next by Date: Re: Luminosity Variance Between Perceptual and RelCol
  • Previous by thread: Call for Monitor profiles
  • Next by thread: Re: Luminosity Variance Between Perceptual and RelCol
  • Index(es):
    • Date
    • Thread