[ValentineC]

Flickr aside, I am surprised nobody (AFAIK) has come up with a way of sanitizing uploaded image files yet.

I wonder if there's a way for GD/ImageMagick to detect the image data and strip everything else. (And if EXIF data is needed for photographs, import all non-binary EXIF data into the system first.)

[Someone]

Many do, but it isn't always "sanitizing". http://www.iptc.org//site/Home/Media_Releases/IPTC_study_sho...:

"According to a study by the International Press Telecommunications Council (IPTC), major social networks like Facebook, Twitter or Flickr remove copyright information and other useful embedded data from pictures posted by their users"

[JimJames]

Imgur does this.

It also compresses big files though so I'm not sure if it can do it without effecting the image data and format itself.

[nodata]

mogrify -strip imagename.jpg

But it won't help. You could just make your data a real image.

[pfortuny]

You might as well change a single byte. A tiny modification and BANG! nobody notices and the service is pretty useless as a general back-up solution.

They could even implement that in their TOS: "whenever you upload a photo you agree to a random byte being modified on one of the pixels on the border."

[shawabawa3]

It would be pretty easy to stick in some redundancy

[jacquesm]

Decompress and subsequent recompress would do this just fine.

[nodata]

What would do what fine? mogrify -strip removes what he asks...

[0x0]

Doesn't Facebook already do this?