Wow you are indeed trying to save a huge file (in the first video the terminal actually outputs the dimension, it’s like 20000px wide…) I’ll definitely check and try handle the case of huge dimensions. I don’t really think it’s a memory problem, it’s likely that some integers overflowed because I don’t think I have used 64 bit integer in some places that could be relevant.
(What kind of usages do you need that big of an image? XD you can see the zoom level at the bottom left of the canvas, and by default it’s 50%)
Anyways, thank you very much for your detailed feedback :D