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DPChallenge Forums >> General Discussion >> A note about EXIF data
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Showing posts 1 - 12 of 12, (reverse)
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 07/28/2003 12:40:21 PM · #1
After uploading pictures to my computer, I routinely look at them using Irfanview. Up through recently, I rotated and resaved pictures taken vertically, unawares that this changed the EXIF information and made it modified EXIF data. I became aware of this when submitting to a different site, where I needed to submit the unmodified original, and a couple were not accepted for this reason.

I don't know how many DPChallenge users might be doing the same as I, maybe none, but just in case, EVEN JUST ROTATING YOUR PICTURE in Irfanview changes the EXIF. I didn't realize that. A while back here at DPChallenge I was asked to submit an original for a DQ request, and I submitted what I thought was the unaltered original - turns out I didn't. I feel pretty stupid for not having realized this earlier, and I'd like to avoid the same problem for anyone else.

Ursula
 07/28/2003 12:43:50 PM · #2
Even if you take photo in TIFF/RAW format comes out with no DATA,so watch out!
 07/28/2003 12:52:56 PM · #3
Originally posted by pitsaman:
Even if you take photo in TIFF/RAW format comes out with no DATA,so watch out!


Didn't know that. Thanks!
 07/28/2003 12:54:17 PM · #4
My tiffs do contain all the exif information. It differs per camera and per software I guess. Strange if the 3800 doesn't, it was introduced later as the 602, wasn't it?

07/28/2003 12:57:03 PM · #5
Originally posted by Azrifel:
My tiffs do contain all the exif information. It differs per camera and per software I guess. Strange if the 3800 doesn't, it was introduced later as the 602, wasn't it?


I'm talking about 5050,3800 has only JPEG!
 07/28/2003 12:57:51 PM · #6
Hi Ursula,
I have a small program called Exifer, where I can safe my original exif data and put it back into the new file if I want to. You can find the program easily on the net.

Here´s one link

Message edited by author 2003-07-28 13:00:52.
 07/28/2003 01:00:13 PM · #7
Originally posted by pitsaman:
Originally posted by Azrifel:
My tiffs do contain all the exif information. It differs per camera and per software I guess. Strange if the 3800 doesn't, it was introduced later as the 602, wasn't it?


I'm talking about 5050,3800 has only JPEG!


Didn't know you had a 5050. :)

07/28/2003 01:01:21 PM · #8
I only use it for Macro and indoor!
 07/28/2003 01:06:41 PM · #9
You should always keep your originals as they come out of the camera untouched, whether for DPC or otherwise. These are the digital equivalent of your negatives.

Always work on a new copy of your files when editing.

Ursula do you have this problem when doing a JPEG Lossless Rotation in Irfanview? This is the only way you should really rotate a JPEG, as a regular rotate-and-save results in further compression loss and possible artifacting.
 07/28/2003 01:15:19 PM · #10
Originally posted by carsten:
Hi Ursula,
I have a small program called Exifer, where I can safe my original exif data and put it back into the new file if I want to. You can find the program easily on the net.

Here´s one link


Thank you, Carsten!
 07/28/2003 01:16:39 PM · #11
Originally posted by ClubJuggle:
You should always keep your originals as they come out of the camera untouched, whether for DPC or otherwise. These are the digital equivalent of your negatives.

Always work on a new copy of your files when editing.

Ursula do you have this problem when doing a JPEG Lossless Rotation in Irfanview? This is the only way you should really rotate a JPEG, as a regular rotate-and-save results in further compression loss and possible artifacting.


Just to show how dumb I am, I didn't know either about the jpeg lossless rotation. Haven't tried it. Will try it. But, for the last two weeks or so, I haven't rotated any originals, NONE!!!
 07/28/2003 07:42:27 PM · #12
My first step in uploading pic to my computer is to move them to an "incoming" folder and make them read only. From there I copy them to other folders for "processing". Then when I accumulate enough in the incoming folder, I save them off to CD.

Though I have still accidentally rotated a few before I made them read only... :-(
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