100% Pen. Only supports one frame (in Scratch) at the moment. See inside for the python code to generate data for a folder of images. Works much better in Turbowarp, where multiple frames can be added and the image renders almost instantly.
All by me, including python code: dropbox.com/scl/fi/7u5i6xhr79o5nzjvzfcj9/framemaker.zip?rlkey=1s4tlbw2zagw5teoehb5lwkyk&st=b39g468b&dl=0
