Comment 2 for bug 1748179

Same issue here with a Dell wireless scanner. I don't think the hardware matters, as the images are scanned fine by Simple Scan, and I can save the scanned pages individually as PNG files.

But saving them in a PDF results in a file that has parts of the scanned pages overlaying each other with some transparency. These PDF files are not usable. (This used to work fine just a few weeks ago, so some update must have messed something up.)

Simple Scan 3.20.0
Linux 4.13.0-38-generic #43~16.04.1-Ubuntu SMP x86_64 x86_64 x86_64 GNU/Linux