IPTC data revisited

Sivakatirswami katir at hindu.org
Thu Jul 19 20:25:18 CDT 2007


Mark Smith wrote:
> 
> On 19 Jul 2007, at 23:35, Sivakatirswami wrote:
> 
>>
>> Right, i'll look into that again... I also downloaded the spec from 
>> adobe: you have
>> to be able to (and know how to) write to any particular image 
>> format... it looks
>> like a binary addition...
> 
> You can use ImageMagick from the command line (shell).
> 
> Getting metadata from images seems to be fairly straightforward. This 
> gets all available exif data:
> 
> put shell("/opt/local/bin/identify -format %[EXIF:*] ~/Desktop/JB.JPG")

Right, reading is not difficult, in fact a low level read
in Rev will deliver the XMP packet... something like

offset(tJpegdata,"<x:xmp" etc.. gets us the packet (see below)

but writing to the file.. that's the trick...
it's a non-trivial pursuit to be sure.

On the ImageMagick forum it seems the puzzle of
inserting XMP data into a file was still an open question
as of March of 2007...

... tests:

I entered some data in Bridge for JPEG file and opened the jpeg file
in a text fld in Revolution:

viola: there, embedded in all the binary code, in pure, human readable 
ASCII is this
little xml packet:

<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Public XMP Toolkit Core 3.5">
  <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
   <rdf:Description rdf:about=""
     xmlns:tiff="http://ns.adobe.com/tiff/1.0/"
     xmlns:exif="http://ns.adobe.com/exif/1.0/"
     xmlns:xap="http://ns.adobe.com/xap/1.0/"
     xmlns:aux="http://ns.adobe.com/exif/1.0/aux/"
     xmlns:crs="http://ns.adobe.com/camera-raw-settings/1.0/"
     xmlns:photoshop="http://ns.adobe.com/photoshop/1.0/"
     xmlns:dc="http://purl.org/dc/elements/1.1/"
    tiff:Make="NIKON CORPORATION"
    tiff:Model="NIKON D50"
    tiff:Orientation="1"
    tiff:ImageWidth="3008"
    tiff:ImageLength="2000"
    tiff:PhotometricInterpretation="2"
    tiff:SamplesPerPixel="3"
    tiff:XResolution="300/1"
    tiff:YResolution="300/1"
    tiff:ResolutionUnit="2"
    exif:ExifVersion="0221"
    exif:ExposureTime="1/800"
    exif:ShutterSpeedValue="9643856/1000000"
    exif:FNumber="4/1"
    exif:ApertureValue="4/1"
    exif:ExposureProgram="0"
    exif:DateTimeOriginal="2007-06-16T05:25:27.00-10:00"
    exif:DateTimeDigitized="2007-06-16T05:25:27.00-10:00"
    exif:ExposureBiasValue="0/6"
    exif:MaxApertureValue="40/10"
    exif:MeteringMode="5"
    exif:LightSource="0"
    exif:FocalLength="550/10"
    exif:SensingMethod="2"
    exif:FileSource="3"
    exif:SceneType="1"
    exif:FocalLengthIn35mmFilm="82"
    exif:CustomRendered="0"
    exif:ExposureMode="0"
    exif:WhiteBalance="0"
    exif:SceneCaptureType="2"
    exif:GainControl="0"
    exif:Contrast="1"
    exif:Saturation="0"
    exif:Sharpness="1"
    exif:SubjectDistanceRange="0"
    exif:DigitalZoomRatio="1/1"
    xap:ModifyDate="2007-06-16T05:25:27.00-10:00"
    xap:CreatorTool="Ver.1.00"
    xap:MetadataDate="2007-07-19T11:09:51-10:00"
    aux:LensInfo="550/10 2000/10 40/10 56/10"
    aux:Lens="55.0-200.0 mm f/4.0-5.6"
    aux:ImageNumber="2570"
    crs:AlreadyApplied="True"
    photoshop:ColorMode="3"
    photoshop:ICCProfile="sRGB IEC61966-2.1">
    <tiff:BitsPerSample>
     <rdf:Seq>
      <rdf:li>8</rdf:li>
      <rdf:li>8</rdf:li>
      <rdf:li>8</rdf:li>
     </rdf:Seq>
    </tiff:BitsPerSample>
    <exif:ISOSpeedRatings>
     <rdf:Seq>
      <rdf:li>200</rdf:li>
     </rdf:Seq>
    </exif:ISOSpeedRatings>
    <exif:Flash
     exif:Fired="False"
     exif:Return="0"
     exif:Mode="2"
     exif:Function="False"
     exif:RedEyeMode="False"/>
    <dc:description>
     <rdf:Alt>
      <rdf:li xml:lang="x-default">Swadhyaya Youth parade in Washington 
with banners</rdf:li>
     </rdf:Alt>
    </dc:description>
   </rdf:Description>
  </rdf:RDF>
</x:xmpmeta>
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


<?xpacket end="w"?>
> Best,
> 
> Mark
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-- 
Om shanti
(In  Peace)

Sivakatirswami
www.himalayanacademy.com

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