I'm trying to discover whether a 'trick' I found is a reliable method for dealing with out-of-gamut when soft-proofing.
Down to the 4th picture is just background info of what I'd tried unsuccessfully so far - so skip for TL:DR.
This is a follow-up to Colour Workflow A - Z in my ongoing saga of trying to get things right when I send it to be printed.
Having successfully recalibrated my workflow in Photoshop so I'm not sending out of gamut pictures to the printers & receiving badly-posterised results back, I now check using soft-proofing with the gamut warning on, so I can check I'm not exceeding limits.
How do gamut warnings in LR soft proofing help? works through the how & why of gamut checking [& I also posted examples there of what you get back from the printers if you ignore them.
So, going back through my existing work, getting ready to have more proofs printed so I can test I got it all right so far, I have been working at reducing saturation in some pictures that were clearly far over the top.
These are just small screenshots from Photoshop
So I try to pull back the purple/magenta in Camera Raw until the gamut warning disappears. This, of course, reduces the levels across the whole picture & is deeply unsatisfactory.
Alternatively, I play with the curves.. frankly making a mess of the whole thing...
Then I discovered a trick - or I think I discovered a trick & I really hope I'm not fooling myself & heading for another expensive disaster...
Edit > Convert to Profile... & use the print shop's own ICC profile for the medium I'm going to print on (which is an RGB profile, not CMYK).
It doesn't come out identical to my input, but it does rather pleasingly compress my out-of-gamut areas into known bounds without affecting the rest of the image, & I now have zero warnings & no horrible posterisation.
I'm a sound engineer by trade, so the idea of audio level compression is one I'm very familiar with. It feels like I just 'discovered' colour level compression.
Have I fooled myself - or is that what I'll get back from the print shop?
(I am, of course, working on a copy, I still have the original untouched version to use next time.)