I usually end up searching cli solutions for resizing, adding borders, reducing image size (ex: pngquant for png). I use Shotwell for manual crop, it has some more features too.
I always think about learning gimp (or someother tool), but never did for past 5+ years of Ubuntu :D
To create cover images or flow diagrams, I use draw.io which has a nice UI
I usually end up searching cli solutions for resizing, adding borders, reducing image size (ex: pngquant for png). I use Shotwell for manual crop, it has some more features too.
I always think about learning gimp (or someother tool), but never did for past 5+ years of Ubuntu :D
To create cover images or flow diagrams, I use draw.io which has a nice UI
Well, learning gimp has been on my todo lists since 20 years ago ;)