Message
Re: [colorvision_group] Checking up on Printfix Pro
2007-10-30 by CDTobie@aol.com
In a message dated 10/29/07 7:15:24 PM, brston73@... writes:
I am new to all this, so I am trying to find out how it all works. I
printed the 150 patch target thru Qimage with no color management
either in Qimage nor the Canon i9900 driver.
The paper is Red River's River Linen, with OEM Canon inks.
Then I read the page in Printfix Pro, and saved the resulting profile.
So far so good...
Then I printed the target tiff again with Qimage using this new profile.
Here's where you start to go astray...
Then I read this new result page in Printfix Pro.
Way off target!
I expected to find
that the target printed with the new profile would show very little
need for correction - the two halves of each patch would look about the
same after reading.
Nope, no relation there. The two halves of the patch are not color managed for such purposes, and even if they were, you wouldn't be changing the "pure" values, and they certainly wouldn't match printer gamut limited patches.
There does not seem to be a good way to compare two results sheets side
by side, but as far as I could tell, the profile did not make much
difference. There were still marked differences between the measured
and desired triangles on many of the patches.
Because thats not a test of what you want to be testing. You want to see what colors printed from a color managed image look like through the profile. Thats what those test images at the end of the application are for...
Is there something wrong with my method here?
Yes. Actually, more than one thing, but since there is no way to "correct" this method, theres no reason to go into detail.
Or am I expecting too
much? Is it just that River Linen cannot produce all the colors called
for by the target?
Your printer, ink, and paper combo certainly can't produce the range of color your monitor can, and visa versa in other areas. But the "raw" target print already defines the printer, ink, paper gamut automatically. "Printer Max Red" will be in the Red patch (255, 0, 0), etc... these colors may be off hue, and a profile may choose from somewhere else in the printer's gamut for printing max red, and different rendering intents may bias towards different available reds when striving for "max red", but those aren't really the issues here.
C. David Tobie
Product Technology Manager
Digital Color Solutions
Datacolor
CDTobie@...
www.spyder3.com
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