Archived posting to the Leica Users Group, 2003/04/03
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At 9:38 PM -0500 4/3/03, Johnny Deadman wrote:
>There is actually a solution of sorts to all of this. It is
>implemented on the 1Ds but not awfully well and the systems are not
>in place to take advantage of it HOWEVER...
>
>It is quite possible to embed a verification code in a digital file
>which is dependent on the image being a bit-for-bit copy of the
>original. As soon as the image is altered in any way, it no longer
>verifies. Software installers use a similar technology.
>
>Now this might not sound terribly useful, because as soon as you
>alter the image in any way (tonal correction for example) the image
>will no longer verify as original BUT if you supply your tweaked
>file along with the unaltered file, an editor can easily check that
>the tweaks do not break any policies. Most of this could actually be
>automated very easily with just a two-second visual check to verify.
>
>So it goes like this in my imagined future. You supply two files:
>the raw camera file and your final version. The photo ed or whoever
>it is plugs them into a piece of software which brings them up side
>by side on a screen and checks that nothing obviously fishy has gone
>one before committing them to publication.
>
>One can even imagine every image containing the raw image as part of
>its file format. That way the two never get separated.
>
>As I say, there are solutions. Not unbreakable, but still robust.
>
>JB
Tentative though this is, it is the only real salvation we have at
present. I hope this type of thing gets developed and proliferates.
- --
* Henning J. Wulff
/|\ Wulff Photography & Design
/###\ mailto:henningw@archiphoto.com
|[ ]| http://www.archiphoto.com
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