I'm using this for a personnal project to generate terminal friendly art and found an issue. I used a palette of specific colors and when i get the ansi code back it uses similar but different colors for some. For example, i use a palette with #626262 grey and the ansi file output is using #616161. Not sure you still update especially for a weird bug like that.
For everyone else, this is probably the best picture to ASCII/ANSI art you can find, and it's really fun to play with !