This is a multi-format image viewer program. It supports IFF, PCX, BMP and Koala (c64). It supports full-screen 320x240x256 color bitmap mode and IFF Color Cycling !
Due to emulator restrictions (it seems) It only works when running from an sd-card file, so I've provided a zipped one that contains the program and a few sample images.
The source code is here https://github.com/irmen/cx16imageviewer
The video below shows the program in action!