问题
That is, if I have image.png and it happens to be an interlaced image, I would like to split the file at the exact offsets where an interlacing block is present. I would like to have the same thing for progressive .jpg files.
I can read the specs and try to figure it out from there, but it would be nice if such a thing existed in e.g. ImageMagic or any other library/tool.
来源：https://stackoverflow.com/questions/35308473/is-there-a-way-to-know-the-offsets-of-interlacing-blocks-in-image-files