I wonder if anyone has any experience with this-- I expect this is a bug that has been in EFI for a long time now.
When running an optimization on a profile one is given 3 options for the paper white:
absolute colorimetric: altering the paper white by laying down a flat tone under the print
"suppress paper white": where efi claims "This setting applies the rendering intent Absolute colorimetric to the media profile but without paper white simulation in the proof"
and finally "keep current paper white (no change): which is defined "With this setting, paper white is excluded from the optimization. However, the absolute colorimetric rendering intent is still applied."
By simply reading the descriptions of the last two I could not understand the difference. The real problem however, is that no matter which option is chosen, the printer still lays down a solid tone under the image unless one switches the simulation profile rendering intent to Relative Colorimetric on EVERY iteration!
I have a situation in which I am making SWOP proofs on a much cooler white paper, and I wish to have the paper white ignored or excluded. REALLY, I just want the simulation to be in Rel Col. In my testing I have had the best results selecting "suppress paper white" then switching to relative colorimetric for the sim profile on every round. However this is quite an arduous process and very prone to failure (on my part, in forgetting to switch) also It bothers me that these two extra options seem to have no effect on the appearance of the print-- I would think that at least one, if not both of them should NOT be simulating the paper white, yet both still seem to do so.
I realize that it is not accurate to proof on a stock that has a very different white point, but my clients simply do not care for the most part, and it is extremely rare that we need to make verified proofs.
Mostly I'm wondering if someone could more clearly define these two white point options, and maybe if anyone has any better ideas on how to do these optimizations (although with my current hack-method I get relatively accurate results, which would pass verification, except for the whites, but it still feels odd)