Satty
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could satty access the clipboard and annotate the latest image? would be more useful for people using gnome shell's screenshot and the like, because it can't be invoked using a command
this would also be faster than opening images in satty using a file manager
alternatively?: otherwise it would be great if satty could be opened on it's own without a file and then have an image pasted into it by the user
Sounds like something that could be done in the future.
In the meantime, you can use a pipe with wl-paste.
E.g.
> grim -g (slurp -d) -t ppm - | wl-copy
> wl-paste | satty --filename -
Does this help?