@devnull Yeah I didn't change the code of the original beta creator, I just embedded it in a web app. It would be great to automatically calculate the scale according to image dimensions, but I'm not fluent in the original programming language / library they used.
I plan on doing a completely new, vanilla JS version of this, where the produced file is SVG, including the image file, so that you can export it, print it, put it in a book, edit it later, and so on. But I don't have time yet