Btw, you don't actually want to use a lossy image container in the modification steps if you don't want to leak any data. JPEG has ways of extracting data that

Btw, you don't actually want to use a lossy image container in the modification steps if you don't want to leak any data. JPEG has ways of extracting data that was either cropped out or written over, by how the compression is performed over the parts of/whole image. Compression artifacts can and will propagate data that you are not fully aware of. PNG is a safer bet for screenshot content for the middle steps. Only the final image should be compressed using a lossy image compressor as then any details can't be diffused to the image if they simply aren't there.