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Replies:
4
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Last Post:
Sep 7, 2008 4:37 AM
by: pkgdk
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How to retrieve XMP metadata from JPEG
Posted:
May 24, 2008 8:42 PM
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I am new to this area. I attempting to extract the XMP metadata from a JPEG file. The spec states that "app1" will contain the XMP metadata. This is to retrieve the metadata regarding licensing from the JPEG.
I have a test file the was created with Adobe Photoshop that has XMP metadata in the file.
However, I cannot seem to find the metadata located in the JPEG itself. I have used the "getImageMetadata" method to extract the metadata and have examined the structure and not found where the xmp metadata is located.
Any help would be appreciated.
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Re: How to retrieve XMP metadata from JPEG
Posted:
May 25, 2008 11:47 AM
in response to: richwt
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I am not sure but think XMP extraction is not supported by the
metadata extraction. You may have to extract the data from
app1 yourself.
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Re: [JAI-IMAGEIO] Re: How to retrieve XMP metadata from JPEG
Posted:
May 25, 2008 11:47 AM
in response to: marcojacob
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I think you can extract the XMP metadata as a string. I suggest you to
use then JempBox (http://www.jempbox.org) to process it.
On May 25, 2008, at 20:47 , jai-imageio@javadesktop.org wrote:
> I am not sure but think XMP extraction is not supported by the
> metadata extraction. You may have to extract the data from
> app1 yourself.
> [Message sent by forum member 'marcojacob' (marcojacob)]
>
> http://forums.java.net/jive/thread.jspa?messageID=276478
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: interest-unsubscribe@jai-imageio.dev.java.net
> For additional commands, e-mail: interest-help@jai-
> imageio.dev.java.net
>
>
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Re: [JAI-IMAGEIO] Re: How to retrieve XMP metadata from JPEG
Posted:
May 25, 2008 9:57 PM
in response to: Fabrizio Giudici
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Thanks for putting me in the right direction. I have written the following code and does what I want now. It reads the XMP metadata from a standard JPEG file not a JPEG200 file (this is next on the list). I am now in the process of modifing the code to write back to the file updated XMP metadata.
Thanks to all who helped.
package org.raven7.service.jpeg;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import org.w3c.dom.Document;
public class XMPJPEGReader {
private static final int xmpJPEGStart = 0xFF;
private static final int xmpJPEGStop = 0xE1;
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
File inputFile = new File("c:/data/output/images.jpg");
String xmp = getJPEGXMP(inputFile);
System.out.println(xmp);
Document docName = org.raven7.W3CUtilities.W3CUtilities
.covertStringToW3CDocument(xmp);
org.raven7.W3CUtilities.W3CUtilities.convertW3CDocumentXML(docName);
String licenseParts = org.raven7.XMPUtilities.XMPUtilities
.getLicenseParts(docName, true, "JPEG");
System.out.println(licenseParts);
}
/**
* Method readJPEGFile
*
* Reads a standard JPEG file and returns the XMP Metadata as a string to the calling application
*
* @param inputFile
* @return java.lang.String
*/
public static String readJPEGFile(File inputFile) {
String result = getJPEGXMP(inputFile);
return result;
}
/**
* Method checkXAPNamespace
*
* Checks that the XMP namespace has been found in the inputStream
*
* @param inputStream
* @return java.lang.String
*/
private static String checkXAPNamespace(FileInputStream inputStream) {
String result = null;
String resultingString = convertJPEGSegmentToString(inputStream);
if (resultingString
.startsWith(org.raven7.constants.NameSpaceConstants.XMPNAMESPACE)) {
result = resultingString.substring(29);
}
return result;
}
/**
* Method getJPEGXMP
*
* Given an input file the XMP metadata in the XMP File is read and the XMP metadata is returned as a String
*
* @param inputFile
* @return java.lang.String
*/
private static String getJPEGXMP(File inputFile) {
FileInputStream inputStream = null;
try {
// Open the JPEG file and read the file into a stream
inputStream = new FileInputStream(inputFile);
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
int offSet = 0;
String result = null;
try {
// Check for end of the file
while ((offSet = inputStream.read()) != -1)
if (offSet == xmpJPEGStart && inputStream.read() == xmpJPEGStop) {
result = checkXAPNamespace(inputStream);
if (result != null)
break;
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return result;
}
/**
* Method convertJPEGSegmentToString
*
* Converts the inputStream to a String
*
* @param inputStream
* @return java.lang.String
*/
private static String convertJPEGSegmentToString(FileInputStream inputStream) {
String result = null;
// Convert the inputStream to a data stream
DataInputStream dataStream = new DataInputStream(inputStream);
byte[] buffer = null;
try {
// convert the data stream to bytes
buffer = new byte[dataStream.readShort() - 2];
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
dataStream.read(buffer);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
result = new String(buffer);
// Return the buffer as a string
return result;
}
/**
* Method convertJPEGSegmentToBytes
*
* Converts the Input stream to a Byte array
*
* @param inputStream
* @return java.lang.Byte
*/
private static byte[] convertJPEGSegmentToBytes(FileInputStream inputStream) {
byte[] result = null;
// Convert the inputStream to a data stream
DataInputStream dataStream = new DataInputStream(inputStream);
try {
// convert the data stream to bytes
result = new byte[dataStream.readShort() - 2];
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// Return the buffer as a bytes
return result;
}
}
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Re: [JAI-IMAGEIO] Re: How to retrieve XMP metadata from JPEG
Posted:
Sep 7, 2008 4:37 AM
in response to: richwt
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I was inspired by your sample code and used it as a basis for XMP extraction in my Java based gallery. I rewrote and optimized it for production use (and fixed what seems like a minor bug in how you read the JPEG APP1 segment size) and it works like a charm. You can have a look at it here:
http://www.pkg.dk/tips/How-to-extract-XMP-metadata-from-JPEG-files-in-Java/
You can use and modify it for your own purpose if you like it. A sample command line program is included in the class, so you can easily test it with your own JPEGs.
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