Message
Re: [colorvision_group] "Saturation" versus "Perceptual" rendering intent -- problems with yellow
2007-11-14 by CDTobie@aol.com
In a message dated 11/14/07 12:31:47 PM, ryannd@... writes:
On the profile I made with PrintFixPro the bright yellows
(especially around the sun in the sunset picture at the lower left
but all yellows in other parts too) are muddy and have lots of black
in them on perceptual and look good on saturation intent. And the
prints look just like the soft proof--unusably muddy on the yellow
colors with perceptual rendering.
You guys off course recomend saturation and not perceptual intent on
rendering and that works fine for CS3. Unfortunately I do almost
all my printing with Lightroom which doesn't give me a choice of
saturation -- it's perceptual or relative only as rendering intent
with Lightroom.
Help!
In one sense, this is a Lightroom issue, in that they do not support the full list of intents. What is happening is that you are asking for out of gamut yellows, and the match is being selected based by Hue and Brightness, without an emphasis on Saturation, in our Perceptual intent. The color with the closest density and hue angle does not suit you. Between now and the next major update to Spyder3Print, there will not be any changes to our color engine, so what you get is what you get, for the time being. This is only one of several reasons I don't print from Lightroom.
On the other hand, the test images you note are filled with oversaturated colors, colors that you don't actually find in photos, only in vector images and heavily adjusted images. This test image has lots of yellows that hit 255 red, and well over 200 green in AdobeRGB. Not colors you're likely to bump into with actual images. So be sure this problem is a problem for your own files before you panic, based on this over-the-top test image. Don't judge the "reasonableness" of these test image yellows by looking at them on your monitor. They are all outside the gamut of a typical display; most are also outside the gamut of a Wide Gamut Eizo display...
C. David Tobie
Product Technology Manager
Digital Imaging & Home Theater
Datacolor
CDTobie@...
www.datacolor.com/Spyder3
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