watermonkey
Striker
what about "film" photographs scanned on..?
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As keeps21 says, it's in the EXIF data. If you don't know how to view this there's a handy little program called Opanda which you can download free that will allow you to right click any picture and view the EXIF. Unless it's been stripped out of course.
Yep, we could always amend the rules so that photos entered must have exif data intact - but we still can't be sure if the exif has been modified or not.
I guess we'd just have to say that people who use shots that weren't taken specifically for the competition are 'only cheating themselves'
My take on it is that it has to be taken after the theme for the month has been announced.
As one of the purposes of the competition is to give motivation and inspiration to get you to pick up your camera and use it.