Read Keywords from JPG

[brethomp]

I'm using the ImageMagickObject in a classic ASP environment. What I would like to do is read the keywords that other programs have put in there (like Adobe Bridge and Picasa) out of JPG files . With TIF files I have it working, using "identify" and "%[IPTC:2:25]", but with JPG files this field seems to be blank, unless the JPG originated from a TIF that had keywords in it. Where can I find the keywords in JPG files?

ImageMagick-6.6.2-3-Q16

[magick]

The metadata in JPEG image files are typically encoded in the EXIF profile rather than IPTC.

[brethomp]

Thanks for the reply. I couldn't find any keywords in the EXIF data. I built a loop to go through all of the EXIF "tags" that are listed on this site http://www.imagemagick.org/script/escape.php. Are there other EXIF "tags" that the keywords could be under? I did also try %[EXIF:*], and didn't see any keywords there either.

[Drarakel]

Are you sure that your JPG file contains the keywords?
You can use "identify -verbose file.jpg" to display most of the metadata.

[brethomp]

Yep, there are definitely keywords in the files, since Adobe Bridge can see them. Further research is leading me to believe that the keywords I am looking for are not stored in EXIF or IPTC. It appears that Adobe and Microsoft have a different place to store them called XMP. Can ImageMagick read XMP?

[snibgo]

convert in.jpg out.xmp

[Bonzo]

We might be looking at the same brethomp thing see viewtopic.php?f=1&t=16454

How did you input your keywords ?

If you open the image in a program like Notepad++ or a hex editor are they in an XML portion at the end of the file ?

[brethomp]

Bonzo,

Yes, if I open the JPG images in Notepad, I can find my keywords in the file. They are in a XML looking portion of the file, but in my case near the beginning of the file. In this format:

Code: Select all

<dc:subject>
    <rdf:Bag>
        <rdf:li>Keyword 1</rdf:li>
        <rdf:li>Keyword 2</rdf:li>
        <rdf:li>Keyword 3</rdf:li>
    <rdf:Bag>
</dc:Subject>

Edit: I missed one of your questions. The keywords were entered using Adobe Bridge.

[snibgo]

Post a sample.

[brethomp]

Post a sample.

Is it possible to post files on this forum?

[brethomp]

convert in.jpg out.xmp

Thanks snibgo, this works, but not optimal. The resulting "out.xmp" file is a text file containing only the XMP metadata. Now I just have to parse the XMP file to get the keywords...

[Drarakel]

Is it possible to post files on this forum?

Don't think so - at least not as fresh user.(?)
FAQ
But you could use one of the various file hosting sites.

[brethomp]

convert in.jpg out.xmp

This method only seems to work with JPG files.

[Drarakel]

No, it works with other formats, too - TIF/PNG/etc. But it's possible for some special files that a certain profile isn't recognized.

[Bonzo]

It worked with a jpg file where the data was around line 54 but not on a CR2 file where the data was at the end on line 186187. Both lots of data were added to the image using Microsoft pro photo tools. No idea why my data was in the image or at the end and and brethomp had his at the start.

I have not had any experiance of this but thought an xmp file was a file linked to and image not part of the image file. Will need some more investigation.