[kwlug-disc] Image Comparison

Khalid Baheyeldin kb at 2bits.com
Fri Aug 14 11:20:15 EDT 2009


> > I've now got something I can use in a script. Thanks to those who
> > emailed me off-list with suggestions :)
>
> That is pretty neat stuff, Chris.  Khalid's earlier post got me
> thinking, "Why not use exif time / date / camera info as a clue that
> two images came from the same source image?"  This way you can locate
> and store sanely the original photo and the resized version, or the
> original and the one that crops out Crazy uncle Richard....  Exif data
> may find photos that are closely related but that vary wildly in pixel
> count.
>

You cannot rely on the EXIF info being carried forward in derivative images
as is.
I think the EXIF info gets removed if you resize, crop, ...etc.

At least that was the case when I last checked.
-- 
Khalid M. Baheyeldin
2bits.com, Inc.
http://2bits.com
Drupal optimization, development, customization and consulting.
Simplicity is prerequisite for reliability. --  Edsger W.Dijkstra
Simplicity is the ultimate sophistication. --   Leonardo da Vinci
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