if Color Base was available in 9600 days, it may well be worth the time to find, install, and run it on the media settings you use for the particular Atkinson profiles. I have not seen Epson drift over the years to the extent you imply, I would suspect an OS, app, or driver update, or combination of those, the be the problem. Or media manufacture evolution? The ColorThink curves are telling you more about what each profile measurement data is reporting about the state of uncorrected output at measurement time than anything else, and differences may even just be between the devices used for each. Without all things being equal, device, software, settings, etc etc, with a before and after profile made identically to compare curves, I'm not sure the curves are helping with your particular issues right now. Tyler
Thanks Scott.
The problem is the 9600 was the last Epson Pro without internal linearization The Atkinson profiles were made with several iterations of the profiling process to carefully define the shifts between inks, such as light cyan to cyan, specific to pattern-of-dots used by the 9600's print engine for the specific paper. When I talked to him I think (many years ago) he said he profiled in many steps/iterations (maybe 8 times) each just one RGB number (for each patch) higher.
I'm not sure how to preserve those valuable response curves created by Atkinson, yet update the changes in the machine over time. My immediate response was to convert [in PS, <Convert-t-Profile>] a small i1 target (RGB 1.5, 288-patch) to the respective Atkinson profile, and then, to profile (or, re-profile) based on that [modified] target. Unfortunately, the result was a much "darker and greener" image when using the protocol (convert the image to the Atkinson profile) with the second profile. I called it a "helper" profile. So, that didn't work, or I did it wrong.
I guess I just have to bite the bullet and profile using Atkinson's 4096-patch i1 target to make a new profile.
When I use ColorThink to look at the Neutral Rendering Curves (using Profile Inspector, Curves tab) for the Atkinson and Epson-supplied profiles, they look different. There are definitely more bumps in the upper part of the red and blue lines.
Do you have any suggestions?
I'll be using PM4.1 with a 4096-patch i1 target (made by Atkinson) and an i1Pro with the hand-powered scan table that came with it.
Tim Vitale Paper and Photographs Conservator Oakland, CA 510-594-82877
-----Original Message----- From: Scott Martin [mailto:scott@on-sight.com]
Hey Tim. Your situation is common. These printers do change over time - especially after heavy usage. All you need to do is make a fresh set of custom profiles. If made well you'll see better results than ever.
Scott Martin www.on-sight.com
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