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Time is Relative Isn't It?
It happens, that more cameras and/or photographers should cover some events. But how to order all the pictures from different sources according to time taken?
My first idea was to synchronize all the cameras before the event. First time, when photographers were only my son, and me we were quite succesful. Beside the problems with photos taken within one minute (the clock on the cameras could not be set exactly on second), the photos were well ordered when ordered by “taken at” timestamp.
My next try was a little bit different. In the middle of the event I’ve noticed another photographer. I’ve asked him for a photos and I’ve got them about a day after the event. But there was a slight problem. The time of the supplemental photografer’s camera was set some hour and few minutes apart from my camera.
That is when I found ExifTool. It takes a little while (some hour or two too long) to find out which was the approximately exact time difference between colegue’s camera and mine, but the result was good.
The only question I’ve had have after this second experience was: How to get the exact time difference between the two cameras?
There are too much problems to snychronize the cametra before the event. And it is even not enough accurate (one minute resolution). The next thought was that each photographer should make a photo of some accurate time source (for example some atomic clock). But it is hard to get the atomic clock on the event.
Then I realized’ that I’m only looking for time difference between one and another camera. For that purpose the time source is not necesarry to be as acurate as atomic clock if both photographers take a picture of the same source, not even necessary on the same time.
At the assumption above, the calculation becomes really simple. Iti is only the matter of differences to find out the proper time difference. If we calculate the difference between each camera and any time source and then calculate the difference between those two differences, we do have the difference that photos from one camera should be adjusted on.
I’ve used the idea above to produce small web time difference calculator. I assume it would take much less time to produce the Ooo Calc sheet, but this seems to be more portable.
The (photographer’s) time becomes relative (at least sometimes).
