I usually prefer PDF images for my LaTeX documents because they are easy to crop/resize using Adobe professional. I am facing a weird problem. I modified one of the PDF images using Adobe professional by writing come comments using the pencil tool and added a rectangular box on the image and saved it. The LaTeX output is not showing the modification that I made to the image file but when i open the image file the modifications are still there. Did anyone face similar problems?
One way to do this preserving the vector form would be to use the Adobe Acrobat "Preflight" tool, which allows you to "flatten" your comments ("Flatten forms and annotations"). I tried to show you an example, but it comes reversed! Maybe it's a bug of version X. :(
Another way inside Acrobat it's to open a console (Ctrl-J) and then execute the command
A third option to selectively flatten your content would be one of the several scripts of the Adobe Exchange like this one (there's plenty of others) in case that