Do we know with which what device these pictures were taken? Digital camera? Cell phone? I don't think we know something even that basic. Did I miss it? I agree that if we have the original storage media with the pictures still on them, then that's a big plus for the defense.
Yes, there is a lot we don't know about the pictures. The boys have smart lawyers and I am sure the integrity of the data has been maintained and experts will so testify.
Nifong seems to be betting that the pictures can be dismissed. Either because the boys had the camera(s)and could have altered the times, or because the pictures are digital and as such can't be relied upon.
My cell phone can be set manually, or I can let the network set the time, for example.
I would really like to see a clear picture with a watch in it.
My understandind is that the pictures shown to the public were taken with a cell phone. There may be others. Pictures always require testimony from witnesses, unless, I suppose, they were taken by security cameras and taken as evidence by the police. Digital pictures are routinely admitted as evidence if they are supported by testimony.
I think there are going to be multiple independent lines of evidence supporting the timeline.