I am attempting to follow to the letter the guidance provided here http://www.colorwiki.com/wiki/Maxwell_ColorValet_Pro#The_yellow_square_test regarding validating that nothing in the print path is influencing the colors going to the printer. I understand the concept that we want our targets to flow through with no correction.
Where I am stumbling is on actually making this reality. First, I should comment that the instructions in the ColorShuttle popup helper window do not apply for my combination of operating system and printer driver. Those tabs and choices simply do not exist.
I am using OS X 10.5 with a Canon iPF8100 and the regular 8-bit operating system CUPS driver.
What I do have are two separate interface tabs, one under the title “Color Matching” that presents two radio button choices: ColorSync or Vendor Matching. If the former is selected, an additional dropdown to select a profile is displayed, and it defaults to Automatic and displays “sRGB v3.0 (Canon)”. If I choose “Vendor Matching”, no dropdowns are available, and the second dialog box which I will describe in the next paragraph becomes available in a different portion of the print interface.
The second screen is in one of the Canon-specific subtabs labeled “Main.” Under Main there is a Color Mode -> Set button that brings up a very promising looking dialog that includes a Matching tab. Under this is a list of choices among which one must be chosen. The choices are:
a) Driver Matching Mode (Kyuanos)
b) ICC Matching Mode
c) No Correction
Obviously it looks like © is a winner, but when I print with this option I see plenty of other ink colorsbeing laid down in that pure yellow square.
I have also tried selected ColorSync in the first dialog, which disables this second Matching option. I see a different pattern of colored dots, but dots nonetheless amidst the sea of yellow ink.
I am left wondering if anyone has found a way to get color correction completely off with this printer.
[Side note: Interestingly, I did another target print on a different type of paper and selected a different Media Type in the Canon driver. (Media types influence head spacing, vacuum pressure, and total ink lay-down, among perhaps many other undocumented things, on this printer series.) I see a very different dot pattern on that paper target using the same supposedly-uncorrected settings. This makes me wonder if perhaps the Canon driver path always enforces some ink/color mapping management no matter what is set in terms of profiles and ColorSync.]
I will cross-post this to the user-supported Canon IPF Wiki and talk to Canon Tech Support this week to see if they have any ideas, but I thought I would post here first.
Thanks for reading!