JPG Hacking
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- LOKi
http://lokidesign.net/2356/2009/…
I'm wondering if anyone has any ideas about specific hacks to the code to cause specific effects.
- 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.
- sikma0
open the jpg file in a text editor and just mess with the code, then resave it
nothing to it
- ********0
I invented it
- ********0
stay away from the first 1000 chars or so, otherwise your file goes corrupt
- LOKi0
@skima, that's exactly what I'm doing, but I'm wondering if anyone knows what the gibberish means. Currently I've pretty much figured out placement, but not sure what represents colour etc.
@digdre yeah, I remember seeing you playing with it in the Show some recent work thread. Any tips?
- sykosis0
This is a great idea. With older phase one backs you used to get black calibrations... if you over shot the image. People still want and try to achieve this effect. Maybe this hacking the file thing will bring upon a new trend.
- ********0
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
- 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
- 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..
- acescence0
try a hex editor instead of plain text