I am very new to zenphoto, so bear with me if the answer is evident.
I am starting to buid a photo database with health and safety equipment in the automotive industry. Amongst other things, I want to show a few forbidden equipment and practices. Ideally, I would like to show these photos with a red bar across them, to clearly emphasize that it is not a good technique. However, most photos will show good situations and won't have that watermark.
Is that possible?