ACR 6.7 can only use the 4 hardcoded color spaces....you can't add to them. ACR 8.x (for CS6 & CC) allow you to select any icc profile (RGB or CMYK or Lab) in the workflow options, but not in ACR 6.x.
BTW, Best RGB and Don RGB fit within ProPhoto RGB. The only benefit (if it's really a benefit) is those two profiles do not go as far in the red primary. However, I've never seen that to be a problem when working in 16 bit. Not sure what you think you'll get using other wide gamut profiles...
Ok, thanks, Jeff, so they're hardcoded. it seemed like that was the case. So you can't add any in 7.x either. What about PSE 12, doesn't it use 8.x?
I just want the freedom to use other RGBs and see what happens. especially after I get my wide gamut monitor.
Don't know about Elements, but arbitrary color spaces was added in ACR 8.x. Can't be done in anything earlier...
I’ve got ACR 8.3 and CS6 on Win 7 and only see the usual 4 hard-wired colour spaces in Workflow Options.
How do you access the “arbitrary color spaces” supposedly added in ACR 8.x ?
Do you have to add these extra colour spaces yourself before you can see them, and if so, where (in which folder) do you place them?
Hum...sorry, it seems to be in ACR 8.x hosted with Photoshop CC...my mistake, sorry...