Experienced shooter and PS user here, but I am totally lost here with this. Suddenly out of nowhere, the colour between LR (fine) and PS is off. I have LR in Prophoto and PS the same, but it's literally more green tinged. I checked that camera raw is updated, and both programs are up to date also but I would appreciate some advice. I tried just about every colour space in PS, including SRGB, but nothing matched what LR is showing in prophoto! Help me lol.
NB - astro images, and it's generally a green cast. Goes away if I go back into LR, even after doing some edits in PS so it is a colour space related issue I would think. Nvidia drivers?
Are you using the Edit in Photoshop path or saving a file from LR and then loading a file into PS.
Doesn't matter what I do. It does same. Edit in photoshop as smart object mostly. But same happens with edit in photoshop...
When you go to PS, do you go through Adobe Camera Raw first?
I import through LR, I don't want to change this as its simplier for me and this shouldnt be happening
First step is to narrow down exactly the path you are using to help debug what is going wrong.
Okay see above
Having the file or a link to the file giving your trouble would be helpful too.
I will try screenshoting tomorrow
I have had some troubles in the past as well, and there are several ways that you can end up with a mismatch.
1) Both LR and PS have separate ACRs. Both versions must match. You can check the version of Lightroom under the "About Lightroom Classic " command. You can find the version in Photoshop under Settings > Camera Raw
2) In association with having the same version, you want to make sure that in Lightroom Preferences/Settings, you "Reset All Warning Dialog" at the bottom of the Preferences/Settings > General page. The reason this is important is if there were a mismatch in ACR versions, it could process the Lightroom image in PS's ACR which has its own color space settings. You normally have a warning about this when doing an "Edit in PS" command, yet if the "Don't show this dialog again" then you don't see the warning . That is a sneak path for having the wrong color space attached to your image.
3) Make sure that the Preferences for External Editing are set as you said to ProPhoto RGB as in this image:
Then, on the Photoshop side, make sure the Edit > Color Settings are set as below. I circled in red the important ones. Using these settings this way should smoothly move from ProPhoto RGB in LR to ProPhoto RGB in PS, assuming the images are tagged right from LR. If they are not tagged right, these color settings will warn you that there is a mismatch and that would help in the debugging. Also, you want to make sure the "Desaturate Monitor Colors By" was not accidentally turned on.
If, after all of these steps, you still have a color mismatch, the issue may be above my pay grade.
Hope these suggestions are helpful.
John Wheeler

Here is what I had before I saw your suggestions

I changed to this (the difference in colour is just I haved stretched the file yet
Even on the new suggestion, I am still getting this weird problem. Now see below:

LR colour - good

PS Colour - weird (smart object, but same occurs with normal layered import)
If you look closely at the PS version, there are also coloured rings not present in the LR version as well as the strange green cast.
Hi
@Primeshooter. from what I see, the LR and PS are closer in being the same than with your prior settings yet the resolution of your images is quite low and I cannot pick out the details your are describing.
I did some more research and I have a couple things to add.
1) Only view the images both at 100% magnification in LR and PS. This will eliminate any potential screen rendering issues.
2) I was making an assumption yet the OS needs to be using the same monitor profile for both LR an PS. I use a Mac and that is pretty much guaranteed yet I am not sure about Windows based OS So that would be worth checking
3) There were a couple setting I saw where they made a different recommendation than I had shared with you before. That is included below with the red being the consistent settings from before and the green are the ones that are different.
I will go through those changes one by one.
1) Using 8-bit dither with 16-bit images and no change in color space between LR and PS, this setting should not make a difference. Yet if you were working with 8-bit images at some point, or changing color spaces, the dither option helps remove banding that might occur
2) Compensate for Source-referred profiles. That's a good one to leave off, but I didn't think such profiles were in play. It would be good to turn off just in case.
3) Turning off Blending RGB Colors Using Gamma. Since you were working with single Layers, this should not come into play yet, leaving it unchecked would be safer
4) Turn off Blend Text Colors Using Gamma. You didn't have text, so I thought it wouldn't be an issue, but it doesn't hurt to leave it off.
Might as well make those changes and see if it helps. Personally, viewing at 100% magnification may be all that is needed, yet using the updated settings would cover all bases.
I'm not sure that will solve your problem, but I am pretty sure this is the limit of my knowledge in debugging your issue.
Hope this helps.
John Wheeler