For soft proofing, you're not using Perceptual to the display:
•Simulate Paper Color and Simulate Black InkOff: Convert using the
relative colorimetric intent with Black Point Compensation.
•Simulate Black Ink: Convert using the relative colorimetric intent
without Black Point Compensation.
•Simulate Paper Color: Convert using the absolute colorimetric
intent (no Black Point Compensation).
Those options are controlling the mapping of the display transforms, not the output itself (the simulate check boxes). That's why they say "Display Options (on screen only).
For conversions, you want BPC on all the time as discussed.
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Rodney: I thought I understood this but in the months since this thread I find that my footing is precarious!
In printing to the Z3100, I follow HP's recommendation to send the output to the printer using Perceptual Intent, and I keep BPC on.
If I want to softproof using Simulate Paper Color, it seems you say that I cannot use Perceptual Intent in the softproof dialog box, but must use Absolute Colorimetric with BPC off. I would then duplicate the image, and adjust the one being softproofed so that it comes closest to what the unsoftproofed copy looks like.
How, then, would I go about softproofing to see whether Perceptual or Relative Colorimetric would be the best choice for my output file?
I also have been told that using Simulate Paper Color is the best choice for seeing the way the print will look.
I feel as if I'm walking in quicksand with this stuff. I had been setting the softproofing dialog using my printer profile, Perceptual Intent, BPC off, and Simulate Paper Color on. So far, the file I send to the printer, which has an adjustment layer or two to make it match the original file, has been producing prints with no real surprises.
I guess what I am asking is this: What settings in the softproofing dialog box would best let me compare how Relative Colorimetric and Perceptual Intent rendering would look, as displayed on my monitor?