Write canvas with annotations to file without making window visible?

[macrintr]

I've built a visual checkpoint routine with ImageView that displays an image, annotates it, then writes the image out with write_to_png. Without moving to something like Cairo, is there a way to modify that routine so that it doesn't display the image?

[timholy]

I'm intermittently revamping ImageView to rebase it on Gtk. Once I get something posted, we can look into adding this functionality.

[macrintr]

Thanks @timholy! If I come up with a workaround, I'll share it.