Dear Ladies and Gentleman,
I want to write the EXIF field "XPComment" to a JPG file, but I did not
find any working examples so I tried to create my own code, but I did
not succeed.
My program is able to write the "User Comment" field but not the
"XPComment" field. (If you change EXIF_TAG_XPCOMMENT to
EXIF_TAG_USERCOMMENT)
I do not understand what is wrong, so please help me. I attached my code
and the output I got to this mail.
Thank you for your help,
Moritz Lichter
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import org.apache.sanselan.ImageReadException;
import org.apache.sanselan.ImageWriteException;
import org.apache.sanselan.Sanselan;
import org.apache.sanselan.common.IImageMetadata;
import org.apache.sanselan.formats.jpeg.JpegImageMetadata;
import org.apache.sanselan.formats.jpeg.exifRewrite.ExifRewriter;
import org.apache.sanselan.formats.tiff.TiffField;
import org.apache.sanselan.formats.tiff.TiffImageMetadata;
import org.apache.sanselan.formats.tiff.constants.ExifTagConstants;
import org.apache.sanselan.formats.tiff.constants.TagInfo;
import org.apache.sanselan.formats.tiff.constants.TiffConstants;
import org.apache.sanselan.formats.tiff.constants.TiffFieldTypeConstants;
import org.apache.sanselan.formats.tiff.write.TiffOutputDirectory;
import org.apache.sanselan.formats.tiff.write.TiffOutputField;
import org.apache.sanselan.formats.tiff.write.TiffOutputSet;
public class Test2 {
/**
* Read metadata from image file and display it.
* @param file
*/
public static void readMetaData(File file) {
IImageMetadata metadata = null;
try {
metadata = Sanselan.getMetadata(file);
} catch (ImageReadException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
if (metadata instanceof JpegImageMetadata) {
JpegImageMetadata jpegMetadata = (JpegImageMetadata) metadata;
System.out.println("\nFile: " + file.getPath());
printTagValue(jpegMetadata,
TiffConstants.TIFF_TAG_XRESOLUTION);
printTagValue(jpegMetadata,
TiffConstants.TIFF_TAG_DATE_TIME);
printTagValue(jpegMetadata,
TiffConstants.EXIF_TAG_DATE_TIME_ORIGINAL);
printTagValue(jpegMetadata,
TiffConstants.EXIF_TAG_CREATE_DATE);
printTagValue(jpegMetadata,
TiffConstants.EXIF_TAG_ISO);
printTagValue(jpegMetadata,
TiffConstants.EXIF_TAG_SHUTTER_SPEED_VALUE);
printTagValue(jpegMetadata,
TiffConstants.EXIF_TAG_APERTURE_VALUE);
printTagValue(jpegMetadata,
TiffConstants.EXIF_TAG_BRIGHTNESS_VALUE);
// simple interface to GPS data
TiffImageMetadata exifMetadata = jpegMetadata.getExif();
if (exifMetadata != null) {
try {
TiffImageMetadata.GPSInfo gpsInfo = exifMetadata.getGPS();
if (null != gpsInfo) {
double longitude = gpsInfo.getLongitudeAsDegreesEast();
double latitude = gpsInfo.getLatitudeAsDegreesNorth();
System.out.println(" " +
"GPS Description: " + gpsInfo);
System.out.println(" " +
"GPS Longitude (Degrees East): " +
longitude);
System.out.println(" " +
"GPS Latitude (Degrees North): " +
latitude);
}
} catch (ImageReadException e) {
e.printStackTrace();
}
}
System.out.println("EXIF items -");
ArrayList<?> items = jpegMetadata.getItems();
for (int i = 0; i < items.size(); i++) {
Object item = items.get(i);
System.out.println(item.getClass());
System.out.println(((TiffImageMetadata.Item)item).getTiffField());
System.out.println(" " + "item: " +
item);
}
System.out.println();
}
}
private static void printTagValue(
JpegImageMetadata jpegMetadata, TagInfo tagInfo) {
TiffField field = jpegMetadata.findEXIFValue(tagInfo);
if (field == null) {
System.out.println(tagInfo.name + ": " +
"Not Found.");
} else {
System.out.println(tagInfo.name + ": " +
field.getValueDescription());
}
}
/**
* Example of adding an EXIF item to metadata, in this case using
ImageHistory field.
* (I have no idea if this is an appropriate use of ImageHistory, or not,
just picked
* a field to update that looked like it wasn't commonly mucked with.)
* @param file
*/
public static void addXPComment(File file) {
File dst = null;
IImageMetadata metadata = null;
JpegImageMetadata jpegMetadata = null;
TiffImageMetadata exif = null;
OutputStream os = null;
TiffOutputSet outputSet = new TiffOutputSet();
// establish metadata
try {
metadata = Sanselan.getMetadata(file);
} catch (ImageReadException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// establish jpegMedatadata
if (metadata != null) {
jpegMetadata = (JpegImageMetadata) metadata;
}
// establish exif
if (jpegMetadata != null) {
exif = jpegMetadata.getExif();
}
// establish outputSet
if (exif != null) {
try {
outputSet = exif.getOutputSet();
} catch (ImageWriteException e) {
e.printStackTrace();
}
}
if (outputSet != null) {
// check if field already EXISTS - if so remove
TiffOutputField xpCommentPre = outputSet
.findField(TiffConstants.EXIF_TAG_XPCOMMENT);
if (xpCommentPre != null) {
System.out.println("REMOVE");
outputSet.removeField(TiffConstants.EXIF_TAG_XPCOMMENT);
}
// add field
try {
String fieldData = "Hallo";
TiffOutputField xpComment = new TiffOutputField(
TiffConstants.EXIF_TAG_XPCOMMENT,
TiffFieldTypeConstants.FIELD_TYPE_BYTE,
fieldData.length(),
fieldData.getBytes());
TiffOutputDirectory exifDirectory =
outputSet.getOrCreateExifDirectory();
exifDirectory.add(xpComment);
} catch (ImageWriteException e) {
e.printStackTrace();
}
}
try {
dst = new File("Hallo.jpg");
os = new FileOutputStream(dst);
os = new BufferedOutputStream(os);
} catch (IOException e) {
e.printStackTrace();
}
// write/update EXIF metadata to output stream
try {
new ExifRewriter().updateExifMetadataLossless(file,
os, outputSet);
} catch (ImageReadException e) {
e.printStackTrace();
} catch (ImageWriteException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (os != null) {
try {
os.close();
} catch (IOException e) {
}
}
}
// file.delete();
// dst.renameTo(file);
}
public static void main(String[] args) {
readMetaData(new File ("Adler (2).jpg"));
addXPComment(new File ("Adler (2).jpg"));
readMetaData(new File ("Hallo.jpg"));
}
}
File: Adler (2).jpg
XResolution: 1
Date Time: Not Found.
Date Time Original: Not Found.
Create Date: Not Found.
ISO: Not Found.
Shutter Speed Value: Not Found.
Aperture Value: Not Found.
Brightness Value: Not Found.
EXIF items -
class org.apache.sanselan.formats.tiff.TiffImageMetadata$Item
282 (0x11a: XResolution): 1 (1 Rational)
item: XResolution: 1
class org.apache.sanselan.formats.tiff.TiffImageMetadata$Item
283 (0x11b: YResolution): 1 (1 Rational)
item: YResolution: 1
class org.apache.sanselan.formats.tiff.TiffImageMetadata$Item
296 (0x128: Resolution Unit): 1 (1 Short)
item: Resolution Unit: 1
class org.apache.sanselan.formats.tiff.TiffImageMetadata$Item
531 (0x213: YCbCr Positioning): 1 (1 Short)
item: YCbCr Positioning: 1
class org.apache.sanselan.formats.tiff.TiffImageMetadata$Item
40092 (0x9c9c: XPComment): 104, 0, 103, 0, 102, 0, 0, 0 (8 Byte)
item: XPComment: 104, 0, 103, 0, 102, 0, 0, 0
REMOVE
File: Hallo.jpg
XResolution: 1
Date Time: Not Found.
Date Time Original: Not Found.
Create Date: Not Found.
ISO: Not Found.
Shutter Speed Value: Not Found.
Aperture Value: Not Found.
Brightness Value: Not Found.
EXIF items -
class org.apache.sanselan.formats.tiff.TiffImageMetadata$Item
282 (0x11a: XResolution): 1 (1 Rational)
item: XResolution: 1
class org.apache.sanselan.formats.tiff.TiffImageMetadata$Item
283 (0x11b: YResolution): 1 (1 Rational)
item: YResolution: 1
class org.apache.sanselan.formats.tiff.TiffImageMetadata$Item
296 (0x128: Resolution Unit): 1 (1 Short)
item: Resolution Unit: 1
class org.apache.sanselan.formats.tiff.TiffImageMetadata$Item
531 (0x213: YCbCr Positioning): 1 (1 Short)
item: YCbCr Positioning: 1
class org.apache.sanselan.formats.tiff.TiffImageMetadata$Item
34665 (0x8769: Exif Offset): 74 (1 Long)
item: Exif Offset: 74
class org.apache.sanselan.formats.tiff.TiffImageMetadata$Item
40092 (0x9c9c: Unknown Tag): 72, 97, 108, 108, 111 (5 Byte)
item: Unknown Tag (0x9c9c): 72, 97, 108, 108, 111
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