There is a menu item in the Nikon D300 to switch on "Image Authentication". This applies to several old professional Nikon cameras like the D3, D700 and all the way back to the D200.
Forget it. It is only of any use if you are willing to invest even more time and money, and even then the use is limited.
This is how it works. If you have the option activated, when you take a picture in nef, tiff or jpeg format, then a flag is stored in the file which can be read to check if the file has been changed.
The files can still be modified without any problem using for example Capture NX or Photoshop.
To read the flag, you need to invest in Nikon's Image Authentication Software. The software costs a few hundred dollars/euro.
This is clearly interesting for legal purposes. But if you just want to prove that the neighbours' cat really walked through your living room, it is probably overkill.
Besides the system was cracked in 2011, so there is no certainty left that the images were not modified. The new professional cameras, D4 and D800 do not seem to have the feature.
Updated 7 July 2012.
Forget it. It is only of any use if you are willing to invest even more time and money, and even then the use is limited.
This is how it works. If you have the option activated, when you take a picture in nef, tiff or jpeg format, then a flag is stored in the file which can be read to check if the file has been changed.
The files can still be modified without any problem using for example Capture NX or Photoshop.
To read the flag, you need to invest in Nikon's Image Authentication Software. The software costs a few hundred dollars/euro.
This is clearly interesting for legal purposes. But if you just want to prove that the neighbours' cat really walked through your living room, it is probably overkill.
Besides the system was cracked in 2011, so there is no certainty left that the images were not modified. The new professional cameras, D4 and D800 do not seem to have the feature.
Updated 7 July 2012.
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