It's raw pixel data, but in general you can't just cat /dev/fb0: only part of the buffer might be be displayed on screen, and there might be colormap involved (

It's raw pixel data, but in general you can't just cat /dev/fb0: only part of the buffer might be be displayed on screen, and there might be colormap involved (even in 24bpp or 32bpp modes). I recommend using fbcat for taking screenshots: https://github.com/jwilk/fbcat https://github.com/jwilk/fbcat