Biggest image in the smallest space
bamsoftware.com
Biggest image in the smallest space
1–10 of 106 posts
Re: Biggest image in the smallest space
#2Actually, it decompresses to a 5.8MB PNG. However, many graphics programs may choose to use three bytes per pixel when rendering the image and because it has incredibly large dimensions, this representation would take up 141GB of RAM.
Re: Biggest image in the smallest space
#3Looks handy for large image processing tests, thanks.
Re: Biggest image in the smallest space
#4That's cool. Presumably the same "attack" could be applied to any file format that uses DEFLATE.
From a legal stand-point, I'd be wary about following through with the authors suggestion of "Upload as your profile picture to some online service, try to crash their image processing scripts" without permission. Sounds like a good way of getting into trouble.
Re: Biggest image in the smallest space
#5PNGs also have optional compressed text metadata chunks, and it's possible to sneak a decompression bomb into one of those as well. You can get about a factor of 1000 in the compression -- 1MB of 'a' winds up being about 1040 bytes. You can have multiple itxt chunks, and it appears that the chunk size is only limited to 2^31-1.
See https://github.com/python-pillow/Pillow/blob/master/Tests/ch... for a quick way to generate some of these.
Re: Biggest image in the smallest space
#6That's neat, but I still think the self-reproducing r.zip from "zip files all the way down" is the best compression trick I've seen:
Re: Biggest image in the smallest space
#7That's neat, but I still think the self-reproducing r.zip from "zip files all the way down" is the best compression trick I've seen: http://research.swtch.com/zip
There's also dynamic generation of output by specifying a custom filter in a RAR archive that is executed during decompression:
http://blog.cmpxchg8b.com/2012/09/fun-with-constrained-progr...
Re: Biggest image in the smallest space
#8That's impressive. Here are some other compression curiosities.
http://www.maximumcompression.com/compression_fun.php
A 24 byte file that uncompresses to 5 MB; another file with good compression under RAR but almost no compression under ZIP; and a compressed file that decompresses to itself.
Re: Biggest image in the smallest space
#9Actually, it decompresses to a 5.8MB PNG. However, many graphics programs may choose to use three bytes per pixel when rendering the image and because it has incredibly large dimensions, this representation would take up 141GB of RAM.
And almost every program that tries to display it.
Re: Biggest image in the smallest space
#10This does wonders when used in favicons :D