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Thread: Exif Info lost after conversion NEF -> JPG

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    Question Exif Info lost after conversion NEF -> JPG

    I want to convert some of my pictures from NEF to JPG to give them, using the Irfan Batch dialog. On the way, all the Exif information contained in the NEF pictures is lost. Is there any settings I can set (other than the well known JPG save settings) to avoid this ?

    Thx, Marc

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    Default Exif Stripped (.TIF->.JPG)

    I have been unable to convert TIFs to JPGs retaining the TIF's Exif data. The JPG Conversion "Keep original EXIF data" data box is checked, but the Exif is nevertheless stripped. This happens with both single file ("Save As") and batch conversions.

    Running IV4.23/W2K. Any enlightenment would be much appreciated...

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    Moderator Enterprise User Bhikkhu Pesala's Avatar
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    It seems that there are different brands of Exif data. The attached image retains its Exif data when I save it as JPG, but a NEF RAW image that I tested lost all of it.

    When I saved the JPG as TIF the Exif data was stripped. If you can find a small TIF image to attach it would help.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Flower14.jpg 
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    Last edited by Bhikkhu Pesala; 06.04.2009 at 01:15 PM.

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    Quote Originally Posted by Bhikkhu Pesala View Post
    If you can find a small TIF image to attach it would help.
    I prepared a very small .tif that illustrates the problem, but unfortunately your forum software will not permit me to upload a .tif - "invalid file". Too bad; I would really like to get to the bottom of this. I need to do batch conversions retaining the Exif data, and IV is my most convenient/fastest tool for the purpose.

    Any other thoughts appreciated...

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    Moderator Enterprise User Bhikkhu Pesala's Avatar
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    Just archive it. You can upload ZIP files.

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    You could perhaps try using dcdraw or ufdraw, but good luck setting the params to interpret the NEF to look as good as what Irfanview does by default. Unless someone can answer my earlier question regarding what parameters the plugin for this uses (nudge nudge).

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    Smile

    Quote Originally Posted by Bhikkhu Pesala View Post
    Just archive it. You can upload ZIP files.
    Ok, the zipped .TIF is attached.

    With this file open in IV, try "Save As" a .JPG, with the save exif option checked. The resulting .JPG as written to disk contains no Exif data. Note that the new .JPG file remaining in your still open IV will show Exif data, but if you close IV, then reopen the new .JPG from disk in a fresh instance of IV, you will find no Exif.

    At least I don't!
    Attached Files Attached Files

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    Quote Originally Posted by daveg View Post
    I have been unable to convert TIFs to JPGs retaining the TIF's Exif data. The JPG Conversion "Keep original EXIF data" data box is checked, but the Exif is nevertheless stripped. This happens with both single file ("Save As") and batch conversions.

    Running IV4.23/W2K. Any enlightenment would be much appreciated...
    This may be why:

    Quote Originally Posted by www.wikipedia.org
    The derivation of Exif from the TIFF file structure using offset pointers in the files means that data can be spread anywhere within a file, which means that software is likely to corrupt any pointers or corresponding data that it doesn't decode/encode. For this reason most image editors damage or remove the Exif metadata to some extent upon saving.

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    Thanks for your reply and the Wikipedia info. Interesting.

    Nevertheless, it appears possible to do the conversion and keep the exif data. For example, if you open a .TIF file in PhotoShop, then "Save As" a .JPG, the exif data is intact in the resulting .JPG.

    Since IV claims (at least by implication) that it's conversion will keep the exif data if the correct option box is checked, it would be handy if it worked.

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    Professional User Skippybox's Avatar
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    I agree it is misleading, but I don't think IrfanView can retain Exif, unless it comes from a JPG. Yet, it can read the Exif just fine from other formats. So, perhaps the coding needs updating to do this.

    Have you tried XnView instead or ExifToolGUI to restore the metadata?

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