IPTC data tag error - LightZone

Posted on 2010-01-29 23:05:43.398114-08 by msbc

Phil

I use LightZone as an image editor for TIF files. After editing a TIF I get the following message with ExifTool 8.09:

Warning: Bad IPTC data tag (marker 0x0) - MSC_091012_0049-Master_lzn.tif

Mark

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Posted on 2010-01-30 03:37:05.609843-08 by exiftool in response to 12277

Re: IPTC data tag error - LightZone

Hi Mark,

It looks like LightZone could be padding the IPTC data with something other than binary zeros. ExifTool gives this warning in case it is incorrectly formatted information that wasn't parsed. If you send me a sample (phil at owl.phy.queensu.ca) I will take a look to see exactly what is going on.

- Phil

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Posted on 2010-01-30 04:49:09.387586-08 by exiftool in response to 12278

Re: IPTC data tag error - LightZone

Hi Mark,

Thanks for the sample. There is some non-IPTC information stored at the end of the IPTC block. I don't recognize the format of this information, but I will look into this in more detail later when I get a chance. The information contains strings such as the document name, artist and copyright (which are of course found in other standard locations in the file as well).

So the exiftool warning is valid, and this information will be lost if the file is rewritten with the -m option.

Do know anything about what LightRoom is putting in here?

- Phil

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Posted on 2010-01-30 18:38:18.196564-08 by msbc in response to 12279

Re: IPTC data tag error - LightZone

Hi Phil,

LightZone provides non-destructive editing of images by saving a TIFF or JPG copy with editing instructions and a reference to the original image - like a proxy. So, the additional data may be the editing stack. Not sure why there would be copies of other metadata values.

I'll do some tests withe -m option to see if the image is still usable in LightZone.

Mark

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