GPS Camera 55. Custom watermark.
The custom watermark includes text and image, and allows you to define background and text colors:

Configure it via Settings > Watermark. Its top part allows you to set up whether the watermark should be applied or not:

Then follows the section with text and image setup:

And the last one at the moment is the colors section:

This hopefully gives enough buttons to configure your own watermark. If I’ve missed something, please drop me a line at support@blocoware.com. I’ll be a good listener!
Oh, wait! I forgot to tell, where from can you add your watermark images… I thought you’d import them from the photo roll, but turns out, most often photo roll will convert png images with transparency to non-transparent jpegs. So I settled on letting you load images from your iCloud, Dropbox, etc:
Tap on a middle row in the Image section to open the picker:

This gives access to all of the File providers that you have on your iPhone, iCloud, Dropbox, Box, Qnap, Synology, etc …
The current watermark image implementation expects a square or circular image. A size of 360x360 is recommended, but the app will of course cope with other sizes.
Options for watermark placement.
From version 1.9.4 . Settings > Watermark > Placement.
Watermark can be now placed in any of the photo corners: bottom/right (default), bottom/left, upper/left, upper/right.
