I am new to all this.. I've already inserted a background and am working on sprites.
All of my sprites are 750 x 1050.. because I'm using them for actual printing on paper. When trying to resize them in your software it let's me do one at a time.. how about a feature to lock aspect ratio? Have this be able to turn on or off.
This way if I change 750 to 100 it would automatically change 1050 to 140 for me.
The way I had to do it currently is open GiMP and find out what 1050 would become.