Hi,

I'v build a jpeg glitching abstraction using GEM and mrpeach. It is based on the works by Antonio Roberts and Ted Davis.

My intention was to get a better undrstanding of the JPEG file structure and find a way to alter the files creatively without destroying them. My first attempts at JPEG glitching consisted in random byte replacement and ended up in lots of unusable / unaestethetical files. After some web searching, I realized that most of the job should be done in the file header by altering specific bytes and carefully avoiding others. This approach allowed me to get visual alterations that go beyond what is usually seen under the "glitch" flag (particle effects, saturation artifacts, file size alterations, to name a few).

The idea here was to build a "swiss knife" for JPEG glitching: a software tool that could alter a JPEG picture in any possible way without destroying it, thus providing glitch artists with a tool that would enable them to create something like a "glitch vocabulary" to express themselves.

You can get an idea of what this tool can do here

This is version 1 of the first of several (I hope) glitching objects. I'd like to push the exploration towards sound and video as well. If there are people out there interested in collaborating, please get in touch, I'll be happy to talk to you.

This is a GOP abstraction: it is meant to be used within a patch and has full control thru inlets, enabling you to trigger it remotely the way you want. There's a mac version and a pc version. They've been tested under pd-extended 0.43.4/OSX Mavericks on a MacBook Pro and pd-extended 0.43.3/Windows 7 on an Acer revo desktop. I do not have any other system to test it on, so please report any bug encountered. There's also a standalone version for mac,for those who do not have Pd installed.

jpeglitchMAC.pd
mac.app
jpeglitchPC.pd

Enjoy!
And let me know what you think...

D.S

this is very nice!! thanks for sharing

it's nice, though I always get a Runtime Error in Windows 7 everytime I upload a picture

yo! I got rid of that runtime error, but now it doesn't work properly. All the images I create are corrupt and I can't see the live glitch (if that's a feature)

Got it working, though sometimes the file is corrupt, using some saturation fx

Hi, I'm using the windows version and PD extended and whenever I try to add an output folder it still says "symbol". No clue what I'm doing wrong as I've never even used Pure Data before now, any help would be appreciated!

Hi David,

Really amazing tool, I'm honoured that my work inspired it! I have a few suggestions for improvement but will e-mail you about it.

Myself and a friend did create a mp4 glitching tool in 2012 but it is very messy. I'll upload it to github and perhaps we can collaborate to make it work better.

@champagnepupi Hi, and thank you for taking the time to try my abstraction. Porting it to windows was harder than I thought and It never worked on my bootcamp/XP system. I couldn't figure out why but I guess a 12 years old OS is just too old to run the latest pd stuff. Sorry about that. I tried it on a win7 system and it worked (I had to rewrite a bit of the GEM part though, to make it less CPU demanding...)

What windows version are you using?

@logakght Hi and thank you for using this tool. I did the best I could to reduce the number of unusable files but could'nt get entirely rid of the problem. I guess it's te price to pay when you mess up with bytes! There should not be too many of them though.

@schafferdavid Hi David, I'm using Windows 8.1!

Then I can not garantee it works... I don't have access to that system, sorry.