Message
Re: [colorvision_group] Re: Extended Grays reducing Print Resolution
2007-10-26 by CDTobie@aol.com
In a message dated 10/26/07 8:34:05 AM, edknight@... writes:
Based on your message, I read the expert (large) target on Epson HW
Matte and then added Extended Grays. Using a loupe, I could still see
higher resolution on the 225 patch target without Extended Grays,
though all looked the same without magnification. However, checking
with the Windows color applet, I see that the large target with grays
creates a profile with a slightly larger gamut (Again, not noticeable
to my eyes on the test file).
The 729 patch target is (mostly) about additional colors in the saturated zones, read gamut edges. The extended grays is about more information in the near grays zone. The two combined add lots of patches throughout the color space, and especially in the near gray zone. Your definition of higher resolution is not based on the accuracy of the grays in question, but rather the number of them in a given ramp. Adjusting colors (including grays) for accuracy may adversely effect smoothness. To use a check that considers ALL the factors, you would have to print each gray patch large enough to measure, and check the NEUTALITY of each, as well as how many distinct levels are present. Adding patches trades off one for the other, to some degree. Your analysis looks at the color values, not smoothness, of the added colors, and (inversely) the gray smoothness, not the color values, of the grays.
C. David Tobie
Product Technology Manager
Digital Color Solutions
Datacolor
CDTobie@...
www.spyder3.com
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