Interesting. Just tried that. It works, but it seems like it doesn't support a lot of Unicode (including Chinese which is my system language and used in a lot of my text files) so it's kind of a deal-breaker to use on a day to day basis.

If gnome-terminal and other mainstream terminals supported sixel though that would be really amazing.

Nevertheless though it would be nice to build support into ROSshow for sixel since it's not that difficult to launch mlterm just for ROS visualizations, and for people who use English only, and in hopes that gnome-terminal will support it one day.