I heard somewhere that specific sites add your ip/name/date to the image code after a download.
(Not visible in the image and i don't mean Sexyfur.)
Someone even said not to upload them here.

So my question is:

Does changing the image in any way "like removing visible watermarks or changing the format" change the code enough so that the saved informations like IPs or time get deleted?

not sure, but if what you're looking for is removing said info, copy paste the image in paint, that usually removes the info for me

I know about the "cut out and paste in a new file" stuff ...

But i'd like to know if changing the image deletes them too.

I tested adding stuff at the end of images and changing anything deleted the line automaticly. But I'm no coder so i don't know if there is a way of adding parts of text to the code without changing the image.

Unless the program you're using automatically replaces the metadata with its own, and it shouldn't, then no, it won't be gone.

I know that's how they do tracking cookies now.. hide info in images so you don't know it's there. I doubt there is any way to do that.. they probably encrypt it.

There's two ways to encrypt info in an image. One is by metadata, the other is by minute colour data in "unused" portions of the image. A screenshot and paste would eliminate metadata, but maintain the colour data.

EDIT: well, not necessarily always minute. Also sometimes it is used as a valid way to transfer information; I recall that Spore uses it to transfer creature information, for instance.

I've heard (and experienced) that viruses can be hidden in images, but I never knew that all this other stuff can be embedded into them.

WolfieWolfie1992 said:
I've heard (and experienced) that viruses can be hidden in images, but I never knew that all this other stuff can be embedded into them.

Images are very easily to manipulate.. hell 4 ways to backdoor FA involve the manipulation of images :3

WolfieWolfie1992 said:
I've heard (and experienced) that viruses can be hidden in images, but I never knew that all this other stuff can be embedded into them.

Viruses being embedded in images is a completely separate issue and is entirely dependent on the client used to open the images. IE just happen to be the most common client used to open images from the internet.

Protip: Images and text-only documents should never be processed in a manner which can be executed as code. Documents with scripts should always be processed in a sandbox which limits code processing to that which you allow, on what you allow.

Lyokira said:
There's two ways to encrypt info in an image. One is by metadata, the other is by minute colour data in "unused" portions of the image. A screenshot and paste would eliminate metadata, but maintain the colour data.

EDIT: well, not necessarily always minute. Also sometimes it is used as a valid way to transfer information; I recall that Spore uses it to transfer creature information, for instance.

Any way of revealing informations in unused portions?

http://lmgtfy.com/?q=digital+watermark

I believe that one can compress information and store it, like, as a minor hue shift in a few areas on the image (ok, the deal is not to fuck it up due to compression algorythms) and use original image to retrieve the difference.