edit xmp metadata: developers needed

Mark Smith mark at maseurope.net
Wed Sep 27 06:01:44 EDT 2006

Henk, at

it describes a typical xmp packet as:

<?xpacket begin='x' id='W5M0MpCehiHzreSzNTczkc9d'?>
... 700 bytes of XML data text ...
... 500 bytes of XML whitespace as padding ...
<?xpacket end='w'?>

so if I understand this right, something like

  put URL ("binfile:" & yourJpeg) into tData
  put offset("<?xpacket begin", tData) into startChar
--- if startChar = 0 then presumably there is no xmp packet....
  put offset("<?xpacket end",tData) -1 into endChar
put char startChar to endChar of tData into tXML
get offset(">",tXML)
delete char 1 to it of tXML

would leave the actual XML data in the variable tXML.

A possible starting point, anyway.



On 27 Sep 2006, at 10:14, Henk van der Velden wrote:

> Good day all,
> Can anyone help me with editing XMP metadata in image files (JPEG)?
> I've searched the archives and I've found some messages about EXIF  
> data and IPTC metadata. But it looks like no one has done XMP  
> reading / editing yet. It wouldn't perhaps be too difficult, since  
> XMP data is 'just' an XML tree put somewhere into the JPEG binary  
> data. But I have no knowledge of binary data, so I can't figure out  
> how to add these metadata to a (JPEG) file.
> Another option might be Image Magick. If an external could be built  
> around the Image Magick libraries, that would provide another way  
> to read and edit XMP data.
> I need this facility for a new application we are going to build  
> for a couple of local cultural institutions. We need to describe  
> lots of historical photographs, and it looks like the best way to  
> store these descriptions is as metadata inside the files. These  
> images are also to be used in educational applications, where  
> children can read - and eventually edit - the metadata.
> There will be a budget to develop this kind of thing. So what I  
> would like to know is:
> - who feels able to develop this?
> - how would you build this kind of functionality
> - an estimation of the costs
> You can contact me off list.
> Kind regards,
> Henk
> --------------------------
> Henk v.d. Velden
> iGlow Media
> Magda Janssenslaan 44
> 3584 GR  UTRECHT
> 0031 (0)6 16 024 337
> www.iglow-media.nl
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