Chafa by Hans Petter Jansson converts images and video to text for terminals. We posted about it before but there are new example images that demonstrates how e.g colour and character sets affect the results.
Original
16 colours, compatible with many terminals
24-bit colour
2 default terminal colours and allows control codes for inverted characters.
240 fixed colours
No colours, no control.
Original
ASCII-fill (16 colours)
Braille fill (16 colours)
No fill (16 colours)