Hi Ralf,
As a workaround, I used "Print To File".
It's not actually a workaround but the correct way to do it.
Is there a better way to save the image with mats to an image file?
What I do in your situation is to make the page size the size of the image (same aspect ratio) use fit to page and have crop on.
When adding the mats, I use the "shrink" option and this way I do not get any white space around the P2F image.
Select User naming with RIP off.
See attached for one I made earlier; it has 3 mats and text.
Terry