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DPChallenge Forums >> Tips, Tricks, and Q&A >> Submitting Proof
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 05/07/2004 03:08:23 PM · #1
I am still confused as to how you get the EXIF info to DPC, and whether you have to leave the original on your memory card. Does the EXIF carry over with the full image? Thanks in advance!
 05/07/2004 03:12:29 PM · #2
I am curious about this too. Considering, I sometimes take all my photos in to photoshop and batch them to save with a file name. Does that rewrite the exif info (changing the date) or will my exif info be kept regardless? And how do you submit exif info?
 05/07/2004 03:12:32 PM · #3
If you simply COPY the file from the card to your computer, nothing should change. If you OPEN and SAVE the file to the computer, things probably will change.

I use a card reader, and transferring the files is merely a matter of dragging them from the card to a directory on the hard drive. To really lock in the data, these can be burned directly to CD-R.
 05/07/2004 03:12:56 PM · #4
Just copying your image from the CF card to your computer will not remove/alter the EXIF data. Processing the image in software will probably alter it if not remove it entirely.
 05/07/2004 03:15:41 PM · #5
Best thing to do is copy file to computer. Always work on copy and rename and when you win a ribbon or asked for a DQ inquiry.You simply submit the original that wasn't worked on.
 05/07/2004 03:16:30 PM · #6
The EXIF is additional data within the file. Certain software allows you to view it, kind of like using "Properties" in Windows or "Get Info" on a Mac.

As I said, if you open and save a file the EXIF data will be altered. That's why we recommend that you set that original file aside, and do any editing on a copy of the file.
 05/07/2004 03:20:15 PM · #7
I "open" every image in the sense of viewing it. Are you only referring to a "save" after having done something to it?
 05/07/2004 03:30:08 PM · #8
Originally posted by Kylie:
I "open" every image in the sense of viewing it. Are you only referring to a "save" after having done something to it?

If you can close the image without executing a SAVE command, then the file on disk should be unchanged; try checking the file modification date. But if, for example, you open the image from your card with Photoshop, and then go SAVE AS and save it to your hard drive, you probably will change the data.

If you just want to check out the images, I'd suggest using a viewer program rather than Photoshop (many free viewers available for all platforms/OS); it's faster and shouldn't change any data.

If you are on Windows, I think you could select all of the image files and, using PROPERTIES, set them all to Read-Only status. I don't think that yould alter the EXIF data, but would force you to save any changes into a new file, leaving the original intact. I think on older Macs you have to change the files one at a time; I don't know about doing it on OS X, but there should be a way to batch-execute a CHMOD (Change Mode) command on a bunch of files.
 05/07/2004 03:32:46 PM · #9
Thanks! That is what I had always thought, but sometimes it gets a little fuzzy here. I should be fine! (Now the bigger problem: How to get into the top 10 and even be asked, or have such an awesome picture that nobody believes it could be real!!!! LOL)
 05/07/2004 03:34:57 PM · #10
you can open and view an image once you transfer it from the Memory card to your PC, and as long as you DONT save it the EXIF data will be intact. If you are just viewing there is NO reason to save the file, just close it.

In my image processing I open the image I want to edit, then when I am done working on it i do a "SAVE AS" and change the file name so it retains the original file name + something to identify its the edited version.

example: original file name - IMG0001.JPG
edited file name - IMG0001_edit.JPG

this ensures that the original file is not compromised and remains 100% intact. and I can always quickly find the original image if needed.

The edited file will NOT have the exif data since it is removed to use that data space for image info so you can have a cleaner image with out the exif data taking up bytes of space, or something like that.

James
 05/07/2004 03:38:19 PM · #11
Oh, one other thing -- I guess a rotation in the viewer then counts as a "save" and could mess it up? My Kodak rotates the image in the camera, but my Nikon you have to do yourself.
 05/07/2004 03:51:24 PM · #12
I keep the original files copied directly from the camera cards in dated folders, and all the others within an "Edited" folder.

Here's the files I end up with:
1. JPEG -- camera capture; consider or make read-only!
2. PSD -- Photoshop file containing cropped and adjusted image; preserves all features such as layers and channels for later re-editing and uses proprietary compression scheme to save some space.
3. TIFF -- The finished Photoshop file flattened into a straight RGB, uncompressed image.*
3a. TIFF/DPC -- the above TIFF file re-sized for DPC; optionally border added.
4. JPEG -- TIFF image with Unsharp Mask applied, saved at best-quality under 150k limit (usually around 7 on a scale of 1-10)

*If I'm going to make a printable file, I start with this cropped/adjusted TIFF, and re-save it as a new Photoshop file so that I can add border and captioning; that's then exported as a printable, high-res/best-quality JPEG.
 05/07/2004 04:10:26 PM · #13
Originally posted by GeneralE:
I keep the original files copied directly from the camera cards in dated folders, and all the others within an "Edited" folder.

Here's the files I end up with:
1. JPEG -- camera capture; consider or make read-only!
2. PSD -- Photoshop file containing cropped and adjusted image; preserves all features such as layers and channels for later re-editing and uses proprietary compression scheme to save some space.
3. TIFF -- The finished Photoshop file flattened into a straight RGB, uncompressed image.*
3a. TIFF/DPC -- the above TIFF file re-sized for DPC; optionally border added.
4. JPEG -- TIFF image with Unsharp Mask applied, saved at best-quality under 150k limit (usually around 7 on a scale of 1-10)

*If I'm going to make a printable file, I start with this cropped/adjusted TIFF, and re-save it as a new Photoshop file so that I can add border and captioning; that's then exported as a printable, high-res/best-quality JPEG.


Paul, Basically I use the same workflow as you do except I just save to .tiff right off when working images with PS7 and don't used .psd at all. As far as I can tell .tiff preserves all the layers and stuff like .psd so I don't go to that step first.

Is there an advantage to .psd that I am not aware of?
 05/07/2004 04:33:03 PM · #14
I think TIFF maintains alpha Channels (selections) but not Layers (like Adjustment Layers) -- these are "Flattened" in the TIFF file -- and you can also duplicate the image onto a new layer and apply a filter (like Blur) without altering the original pixels.

I think Photoshop's compression of a multi-channel image makes a smaller file than an uncompressed TIFF.
 05/07/2004 04:47:02 PM · #15
Thanks... I don't use adjustment layers very much so that is probably why I didn't know the difference. I guess when you create new layers from scratch you always get an alpha channel. I should try to understand these things better some day. :)

Originally posted by GeneralE:
I think TIFF maintains alpha Channels (selections) but not Layers (like Adjustment Layers) -- these are "Flattened" in the TIFF file -- and you can also duplicate the image onto a new layer and apply a filter (like Blur) without altering the original pixels.

I think Photoshop's compression of a multi-channel image makes a smaller file than an uncompressed TIFF.

05/07/2004 05:16:11 PM · #16
I also have a question on the exif information. It used to be that when I right clicked on a photo then clicked on properties it would give me an advanced option which would list all the exif information. Now when I download from the camera to the hard drive I get an info.txt file with all the exif information for all the shots being downloaded. Then when I go to the photo's properties it doesn't give me the exif info. I am using the same camera, the same card reader and the same programs. I am wondering if it was an update to windows xp that changed it. Can anyone tell me if I can change this back? I am running Windows xp professional.
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