How to insert a color value into an image's xpacket?

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my problem seemed simple: have computed property of image , want insert property image's metadata. in metadata see xpacket sorts of neatly recorded data. want add simple like:<br />] <br />i colorswatch: 0xff00bb<br /><br />] <br />b question 1: <br />will metadata harmed inserting <br />some text long delete equal number of <br />pre-existing blanks?  there checksum? <br />do have use xmp sdk , program in c? <br /><br />so started reading. alphabet soup: xmp dc rdf rdfs . . .  no 1 seems appreciate value of presenting little working example.  pieced approach below.<br /><br />b question 2: <br />has approach prayer of doing useful? <br /><br />step 1 - define pixa:color tag. upload file to<br />i http://physpics.com/namespace/pixa.rdf:<br /><br />   <?xml version="1.0"?> <br />   <rdf:rdf xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"<br />            xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"><br />   <rdfs:class rdf:id="color"><br />     <rdfs:subclassof <br />          rdf:resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#resource"/><br />   </rdfs:class><br />   <rdfs:simpletype name='colordata'><br />      <rdfs:restriction base='hexbinary'><br />         <rdfs:length value='6' /><br />      </rdfs:restriction><br />   </rdfs:simpletype><br />   <rdf:property rdf:id="color"><br />      <rdfs:comment>color swatch value picture</rdfs:comment><br />      <rdfs:domain rdf:resource=""/>     <rdfs:comment> ? </rdfs:comment><br />      <rdfs:range rdf:datatype="colordata" />           <br />   </rdf:property><br /><br />b question 3: <br />what domain?  should somehow reference xpacket, guess.<br /><br />step 2 - add pixa namespace rdf:description. head of xpacket like.<br /><br /><?xpacket begin="" id="w5m0mpcehihzreszntczkc9d"?>  <br /><x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="3.1.2-114"><br /> <rdf:rdf xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"<br />          xmlns:pa="http://physpics.com/namespace/pixa.rdf#"><br />  <rdf:description rdf:about=""<br /><br />note original about= value empty!<br /><br />step 3 - code insertion xpacket. believe (anyway, hope) looks this:<br />   <dc:description><br />    <rdf:alt><br />     <rdf:li><pixa:color>0xff00bb</pixa:color></rdf:li><br />    </rdf:alt><br />   </dc:description><br /><br />phew. that's it. work????<br /><br />thanks taking time work through this.<br />fred hansen

a more readable version of comment @ "how insert color property?"

and namespace/pixa.rdf exists.



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