I am having trouble exporting images from photoshop. I usually edit my photos in prophoto and then convert the color space to sRGB when I export ("export as"). However, working with my desktop computer now it doesn't seem to work, and the exported image looks very over saturated. When I try the same process with my laptop the colors doesn't change this much at all.
You are working in 16bit and seem to not be using any actual color management. You will have to look into your CM settings and actually use the proof preview at the very least. Also if it worked before you need to check whether you have changed soemthing on your system recently like assigning a new monitor profile or messing with the screen settings.
Thank you so much for your quick reply. I have been trying to understand color management, but find it very challenging. I did find I had different "color settings" on my laptop vs my desktop computer. On my laptop I have the setting "Europe General Purpose 3", and when I changed it on my desktop the problem was solved. Still, I am not sure I completely understand what this means?
The important thing here is the embedded document profile. As long as there is one, it will always override the working space! And that's what it should do.
Always keep your color management policies set to "preserve embedded profiles". That's the default, don't change it. Not much can go wrong with this setting - as long as there is an embedded profile.
So to sum up:
Export's color management has been buggy for a long time, in different ways, and it still doesn't work correctly. I have the same here.
To be perfectly honest, I have given up on Export. For some reason they can't seem to get it right. I still use Save For Web, which thankfully still works as it should, and with reliable color management as long as you check the right boxes.
Normally it should display correctly as long as you have "embed color profile" checked (in addition to "convert to sRGB"). But it doesn't.
In short - use Save For Web. Check the two boxes, and also remember to set Preview to "use document profile". Then you'll be fine.
The preview you show isn't properly color managed but the final image should be.
This is the same kind of buggy issue we see in the Print dialog too. The preview there isn't properly color managed and doesn't look right. It has been this way for years. On one hand, it should be fixed as should Export. On the other hand, one can argure it is for FPO only, so ignore it and move on.
Personally I'm in favor of the first camp; all previews should match the previews before you use some command to show you a new one, but alas, they don't always do so.
Bascially just ignore these improper previews, the actual exported document (and printed document) should be properly color managed.