Ok here is an example of an offending file. This started off life, for me at least, as a Library of Congress TIFF file. Which I think could possibly be another clue to the bigger issue here. I seem to remember reading somewhere that TIFF’s contain embedded ICC profiles, true or not? Now I can’t say for sure but I don’t think I’ve ever printed this file directly as a TIFF. So could this be part of the problem?
The offending areas are in the lower left corner and left of the white line running down the aisle and on the table with tools on it. Now I realize this is a challenging file in these areas to say the least and yes indeed there are and should be blacks in this area but as I think you can see even in this JPG file there is a lot of detail in the bricks and table that just all turn Dmax black. This is when printed on BC Crystal Glossy canvas and is just barely better on BC VibranceGloss photo paper. I might add this is with profiles built for these papers and optimizing the profiles using this file in particular, as a TIFF file by the way, with or without attached ICC profile from the Library of Congress who knows, as per PhotoMunki’s file type needs for profile optimization.
Well I’ve figured some of it out. Thank you TIM! But now I have a different issue.
It is indeed an out of gamut problem for the printer; well we kind of knew that before, but now I see PS was trying to tell me. It was right there on the darn screen, only it is so subtle on the screen that you can’t easily see the gamut warning until you turn gamut warning OFF! Apparently the out of gamut warning, which was set as light gray, appears as false detail and lightens the apparent values on the screen. Even after editing PS preferences for the Out of Gamut indicator color it really is not at all apparent in this file when PS is displaying it on screen. In fact all the out of gamut indication does is make the damn file look better on screen, well at least in the dark shadow areas. Go Figure!
Apparently for reasons unknown the onscreen gamut warning in CS6 doesn’t work quite as well as it should, at least for this file. I can set the preferences to any color I wish for gamut warning color and even if I magnify offending areas to an individual pixel level at 3200% all I see is a shift from one shade of dark gray to another very slightly different shade of dark gray when I turn gamut warning in soft proofing on and off. Not a single pixel changes to the garish bright yellow I now have it set to. What’s up with that?
So once again thanks Tim for getting me to look really really hard at the gamut warnings provided in soft proofing, they apparently do work, just sometimes they won’t jump up and smack you upside the head like one would imagine they should.
Anybody know any of the programmers at Adobe that might like to look at this?