You got me curious so I set up the PDI target in Acrobat with 8 versions of one image in tagged and untagged pairs of sRGB, AppleRGB, AdobeRGB, ProPhotoRGB — here: http://www.gballard.net/PDItest.pdf (2.1MB download) sorry I couldn't figure how to attach a file in my forum message.
It appears you thought correct, but I can't see how it is otherwise misbehaving when I switch Working RGB:
"I would think that Acrobat would honor the three profiles and display the images accordingly, and for the untagged image it would apply whichever profile was set up in the Color Settings.
The most obvious test would be to set your Working RGB to ProPhoto RGB and watch the ProPhotoRGB (working RGB) profile be applied-assumed-applied-defaulted to the untagged images while displaying the tagged images correctly just like in Photoshop (be sure to switch back).
A few questions:
1. In Acrobat Output Preview, do you see an Output Intent by the Simulation Profile?
2. In Acrobat Output Preview, when you pull down beside Show to Calibrated, do all the images remain visible except the untagged image?
3. What are the color spaces of the tagged images?
4. What are your default Acrobat color spaces?
Sorry for all the questions but I am unable to replicate your problem (so far anyway).
For example, I have a PDF with four images -- three are tagged with color profiles, one is untagged. I can verify that each image has the correct profile applied by opening the PDF into Photoshop and extracting the images; each one opens correctly tagged.
I'm not sure what you mean here. If you control or right click on the image in Acrobat with the Touch Up Object and go to Edit Image, it should open in Photoshop. Is that what you are doing?
Acrobat doesn't have any options (that I can find) for honoring, discarding or converting embedded profiles, as in Photoshop/InDesign/Illustrator, only options to specify RGB, CMYK and greyscale profiles. (Even "Color Management Off" doesn't seem correct, as it still applies Web SWOP.)
Acrobat is not a design platform like the other apps so the Color Management options do not correlate. Even though you can do heavy editing and color conversions in Acrobat, the app remains an evaluation tool in most workflows.
I'm not sure about the Web SWOP comment but it makes me think you are working with CMYK on a regular basis. In your PDF, do have all CMYK images, or a mix of RGB and CMYK?
Sorry I can't help more. Post back with specifics and hopefully someone can shed more light on your problem.