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How to read xmp metadata in PS using javascript

Forum|Forum|3 years ago
May 26, 2022
5 replies
4072 views

How its possible, using javascript, to read some information from pdf with xmp metada (I think it's an xmp metadata, but maybe I'm wrong since I don't have much experience with these files).

I have some pdf template files and they have some information imortant for me. Could you help me how to read information for vsize hsize from this document, using javascript? Thanks in advanced

<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="XMP Core 5.1.2">
   <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
      <rdf:Description rdf:about=""
            xmlns:egGr="http://ns.esko-graphics.com/"
            xmlns:egInk="http://ns.esko-graphics.com/">
         <egGr:nrpages>1</egGr:nrpages>
         <egGr:startlogpage>1</egGr:startlogpage>
         <egGr:units>mm</egGr:units>
         <egGr:vsize>120</egGr:vsize>
         <egGr:hsize>120</egGr:hsize>
         <egGr:margtop>20</egGr:margtop>
         <egGr:margbot>10</egGr:margbot>
         <egGr:margleft>20</egGr:margleft>
         <egGr:margright>20</egGr:margright>
         <egGr:readerspread>False</egGr:readerspread>
         <egGr:screenreg>False</egGr:screenreg>
      </rdf:Description>
      </x:xmpmeta>

This topic has been closed for replies.

Correct answer Stephen Marsh

@milevic

OK, I finally have it working, based on the script from jazz-y and another one from the Illustrator forum... For an open file:

#target photoshop
var ns = "http://ns.esko-graphics.com/grinfo/1.0/";
ExternalObject.AdobeXMPScript = new ExternalObject('lib:AdobeXMPScript');
xmpMeta = new XMPMeta(app.activeDocument.xmpMetadata.rawData);
var theValue = xmpMeta.getProperty(ns, "vsize");
alert(theValue);

Here is a visual of the XMP metadata and how it relates to the code:

P.S. The previous example parses the XML value as a string, you may need to convert it to a number if you need to perform mathematical operations on the value, again, for an open file:

#target photoshop
var ns = "http://ns.esko-graphics.com/grinfo/1.0/";
ExternalObject.AdobeXMPScript = new ExternalObject('lib:AdobeXMPScript');
xmpMeta = new XMPMeta(app.activeDocument.xmpMetadata.rawData);
var theValue = Math.abs(xmpMeta.getProperty(ns, "vsize"));
alert(theValue);

Edit: Via a hard-coded path:

#target photoshop
var f = new File('~/Desktop/esko-art-sample.pdf');
var ns = "http://ns.esko-graphics.com/grinfo/1.0/";
ExternalObject.AdobeXMPScript = new ExternalObject('lib:AdobeXMPScript');
xmpMeta = new XMPFile(f.fsName, XMPConst.FILE_PDF, XMPConst.OPEN_FOR_READ).getXMP();
var theValue = Math.abs(xmpMeta.getProperty(ns, "vsize"));
alert(theValue);

Via an open dialog:

#target photoshop
var f = File.openDialog();
var ns = "http://ns.esko-graphics.com/grinfo/1.0/";
ExternalObject.AdobeXMPScript = new ExternalObject('lib:AdobeXMPScript');
xmpMeta = new XMPFile(f.fsName, XMPConst.FILE_PDF, XMPConst.OPEN_FOR_READ).getXMP();
var theValue = Math.abs(xmpMeta.getProperty(ns, "vsize"));
alert(theValue);

M

milevicAuthor

Inspiring

@Stephen Marsh could you help me with this one. I have an jdf file with xml listed bellow, but i stuck, how to read "value" for "job"?

<?xml version="1.0" encoding="UTF-8"?>
<JDF xmlns="http://www.CIP4.org/JDFSchema_1_1" xmlns:eg="http://www.esko-graphics.com/EGSchema1_0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="Product">
<eg:SmartName Name="Job" Value="Poland_001"/>
<eg:SmartName Name="Barcode" Value="Yes"/>
<eg:SmartName Name="Separation" Value="CMYK"/>
<eg:SmartName Name="Paper_grade" Value="300g"/>
<eg:SmartName Name="Template" Value="Template_box"/>
</JDF>

Stephen Marsh

Braniac

Sorry, no luck with the JDF, perhaps a more knowledgeable scripter can post working code...

https://community.adobe.com/t5/photoshop-ecosystem-discussions/use-values-from-xml-into-ps/m-p/11546356

Manan Joshi ?

M

milevicAuthor

Inspiring

I finally resolved this. Maybe it will be useful for someone.

var XMLfile = new File("/Users/rsmilevicm/Documents/test.jdf");
XMLfile.open('r');
var str = "";
str = XMLfile.read();
XMLfile.close();
var xml = new XML(str);
default xml namespace = "http://www.esko-graphics.com/EGSchema1_0";
var job_name = xml.xpath("//*[@Name = 'Job']/@Value");
alert(job_name)

Stephen Marsh

Braniac

Here is an example of reading XMP from a file or from an opened document from jazz-y:

https://community.adobe.com/t5/photoshop-ecosystem-discussions/determine-compression-used-on-tiff-file/m-p/11141851

~~I think you would need to get it from the file, not the opened document. Without access to a sample PDF file containing this Esko metadata, I can't test or offer direct assistance.~~

Edit: Another couple of examples –

https://community.adobe.com/t5/photoshop-ecosystem-discussions/script-to-get-metadata-without-opening-the-file/td-p/11992046

https://community.adobe.com/t5/photoshop-ecosystem-discussions/get-print-dpi-resolution/m-p/10502703

Stephen MarshCorrect answer

Braniac

@milevic

OK, I finally have it working, based on the script from jazz-y and another one from the Illustrator forum... For an open file:

#target photoshop
var ns = "http://ns.esko-graphics.com/grinfo/1.0/";
ExternalObject.AdobeXMPScript = new ExternalObject('lib:AdobeXMPScript');
xmpMeta = new XMPMeta(app.activeDocument.xmpMetadata.rawData);
var theValue = xmpMeta.getProperty(ns, "vsize");
alert(theValue);

Here is a visual of the XMP metadata and how it relates to the code:

P.S. The previous example parses the XML value as a string, you may need to convert it to a number if you need to perform mathematical operations on the value, again, for an open file:

#target photoshop
var ns = "http://ns.esko-graphics.com/grinfo/1.0/";
ExternalObject.AdobeXMPScript = new ExternalObject('lib:AdobeXMPScript');
xmpMeta = new XMPMeta(app.activeDocument.xmpMetadata.rawData);
var theValue = Math.abs(xmpMeta.getProperty(ns, "vsize"));
alert(theValue);

Edit: Via a hard-coded path:

#target photoshop
var f = new File('~/Desktop/esko-art-sample.pdf');
var ns = "http://ns.esko-graphics.com/grinfo/1.0/";
ExternalObject.AdobeXMPScript = new ExternalObject('lib:AdobeXMPScript');
xmpMeta = new XMPFile(f.fsName, XMPConst.FILE_PDF, XMPConst.OPEN_FOR_READ).getXMP();
var theValue = Math.abs(xmpMeta.getProperty(ns, "vsize"));
alert(theValue);

Via an open dialog:

#target photoshop
var f = File.openDialog();
var ns = "http://ns.esko-graphics.com/grinfo/1.0/";
ExternalObject.AdobeXMPScript = new ExternalObject('lib:AdobeXMPScript');
xmpMeta = new XMPFile(f.fsName, XMPConst.FILE_PDF, XMPConst.OPEN_FOR_READ).getXMP();
var theValue = Math.abs(xmpMeta.getProperty(ns, "vsize"));
alert(theValue);

M

milevicAuthor

Inspiring

Thank you all, for your commitment, this is really good job.

@Stephen Marsh thanks a lot

M

milevicAuthor

Inspiring

Hmmm... i just need to read this specific attribute and use that value later in PS script, i dont need to import pdf into PS. I had similar issue with XML and it s resolved, but now i am stucked. I dont know how to read those egGR tags.

https://community.adobe.com/t5/photoshop-ecosystem-discussions/use-values-from-xml-into-ps/m-p/12964501#M646001

L

Lumigraphics

Braniac

My script example shows you how to read individual values.

Stephen Marsh

Braniac

I would think that one would need to use BridgeTalk or some other method to *directly* get the XMP metadata out of the PDF and do something with it in Photoshop, as once you rasterize the PDF that metadata would be lost (or so I'm assuming).

Edit: I have just pulled a customer file out of the archive that was processed by Esko Automation Engine, and lo and behold, when rasterizing the PDF into Photoshop – the Esko metadata is retained (much to my surprise)!