JPG Hacking
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- acescence0
try a hex editor instead of plain text
- digdre0
Rand, i'm sure someone here on qbn is able to make this.
no?
how about we ask around?
- lvl_130
this is pretty cool.
by copying and pasting you can create the infamous pizel stretch hahaha
- ribit0
what if you could reverse engineer it so you just draw the hack you want in the image window and it updates the file code for you? oh, wait..
- lvl_130
it really gets fucked when you copy and paste from one image to another
- miesvan0
i like "specific hacks"...
- LOKi0
well, I've kinda figured out how to move parts of the image around just by copying and pasting large chunks of code, but i was hoping some people might no what character combinations cause other effects like the patterning and colour variations.
- lvl_130
I would think opening up another image. Finding the right spot in the code where the pic is your desired color and then comparing it to your first image. I'm not sure if that makes any sense, but it makes sense to me ahaha
- uan0
maybe you find something in the source of jpeg:
Wallace, Gregory K. "The JPEG Still Picture Compression Standard",Communications of the ACM, April 1991 (vol. 34 no. 4), pp. 30-44.
ftp://ftp.uu.net/graphics/jpeg/w...
- uan0
/www... means
/wallace.ps.gz
- vaxorcist0
PHP, using some image libraries can do quite a bit on the server-side....
- jimbojones0
Al Qaeda used the hacks to transmit secret messages in the code of the pics. Do you have something to do with that?
- mg330
I think if you pick up a photoshop tutorial book from 1998 you'll find a guide for how to do that sort of thing.
- designbot0
why not mess around with creating Photoshop scripts? Seems like the easiest way to try and create a similar effect.
- armsbottomer0
i messed around with glitching jpgs a while back. i started by just manually editing the text info, but then just wrote some php and processing apps that subtly randomized the byte info and saved the manipulated images. then i filtered the difference between the two text files to see where the changes were. it was still far from meaningful, but creating a basic app to do your dirty work for you is a much more rapid way of finding out what text corresponds to which part of an image in an image text file.
- i only used php bc it was a dynamic app that scraped images from the web. i'd recommend using processing.armsbottomer
- sikma0
open the jpg file in a text editor and just mess with the code, then resave it
nothing to it
- digdre0
I invented it
- digdre0
stay away from the first 1000 chars or so, otherwise your file goes corrupt