Using GIMP I am able to load a number of files with File>Open-as-Layers, then File>Export as an animated GIF. The layers are automagicly centered. I would like them to be aligned by the upper left corner instead.
I assume that would need to be handled when the files are first loaded but the only option on the Open-as-Layers was to specify which files to load.
If the frame files have filenames containing numbers of sequential frames (for example frame01.png, frame02.png and so on) you could use GIMP Animation Package plugin to automatically convert them into a GIF.
Just install GAP, open the first frame and choose Video → Frames to Image. You'll be asked to configure frame times, looping, blending etc. Frames will be aligned to top left corner by default.
