I run my Raspberry Pi headless and I don't like to access X windows.
Sometimes I need to look at an image, mostly PNG. I use my Pi to produce graphs and I want to see if the change took.
cacaview allows me to view the images as ASCII in the terminal. Which allows me to have a quick look at the image, and it also looks kinda cool and retro.
Install and using cacaview
To view an image:
+ Zoom in
- Zoom out
d Change differ