>>3219
>There are files that take up over 4MB that cannot be posted on /Mlp/ and because of that, you have to compress them on purpose in order to post the pic you want.
Pushing my arithmetic encoding jpeg gospel agenda to the extreme and almost obnoxious, little fun fact, there actually were some files as big as 800MB (that's right, megabytes) that you could post on 4chan.
How?
You see, when uploading a JPEG on 4chan, it strips its exif data (for security purposes), but not only that. It also undoes progressive scan and arithmetic encoding. (Scroll through your saved-from-4chan jpegs and you'll see that they all are baseline JPEGs with Huffman coding). By carefully crafted jpeg image, one could upload 800 byte file that got expanded into 800MB beast by 4chan.
But it seems like they fixed that hole.
https://desuarchive.org/qa/thread/2411811