Here's a simple image/pdf (if pdftoppm is installed) viewer written in bash/yad. You will be able to rotate the images and resize with right click options.
0.4 - added ffmpeg options for flipping, zooming, and saving edited image as well as added edit options with various installed programs and all of the poppler-utils tools (pdfattach pdfdetach pdfimages pdftocairo pdftohtml pdftoppm pdftops pdftotext pdfunite)
0.5 - minor improvements