private static void printTagValue(JpegImageMetadata jpegMetadata, TagInfo tagInfo)
throws ImageReadException {
try {
// ---------------------------------
// KEY PART: Extract EXIF by TagInfo
// if you use findEXIFValueWithExactMatch,
// the method throws NullPointerException when the provided tag does not present in the
// metadata
// ---------------------------------
TiffField field = jpegMetadata.findEXIFValue(tagInfo);
if (field != null) {
// get actual stored value in metadata
Object value = field.getValue();
System.out.println(tagInfo.name + ": " + toString(value));
}
} catch (NullPointerException e) {
}
}
public void showAllMetaData(final File file) throws ImageReadException, IOException {
// get all metadata stored in EXIF format (ie. from JPEG or TIFF).
final ImageMetadata metadata = Imaging.getMetadata(file);
if (metadata instanceof JpegImageMetadata) {
final JpegImageMetadata jpegMetadata = (JpegImageMetadata) metadata;
// Jpeg EXIF metadata is stored in a TIFF-based directory structure
// and is identified with TIFF tags.
// Here we look for the "x resolution" tag, but
// we could just as easily search for any other tag.
//
// see the TiffConstants file for a list of TIFF tags.
System.out.println("file: " + file.getPath());
// print out various interesting EXIF tags.
showTagValue(jpegMetadata, TiffTagConstants.TIFF_TAG_XRESOLUTION);
showTagValue(jpegMetadata, TiffTagConstants.TIFF_TAG_DATE_TIME);
showTagValue(jpegMetadata, ExifTagConstants.EXIF_TAG_DATE_TIME_ORIGINAL);
showTagValue(jpegMetadata, ExifTagConstants.EXIF_TAG_DATE_TIME_DIGITIZED);
showTagValue(jpegMetadata, ExifTagConstants.EXIF_TAG_ISO);
showTagValue(jpegMetadata, ExifTagConstants.EXIF_TAG_SHUTTER_SPEED_VALUE);
showTagValue(jpegMetadata, ExifTagConstants.EXIF_TAG_APERTURE_VALUE);
showTagValue(jpegMetadata, ExifTagConstants.EXIF_TAG_BRIGHTNESS_VALUE);
showTagValue(jpegMetadata, GpsTagConstants.GPS_TAG_GPS_LATITUDE_REF);
showTagValue(jpegMetadata, GpsTagConstants.GPS_TAG_GPS_LATITUDE);
showTagValue(jpegMetadata, GpsTagConstants.GPS_TAG_GPS_LONGITUDE_REF);
showTagValue(jpegMetadata, GpsTagConstants.GPS_TAG_GPS_LONGITUDE);
showTagValue(jpegMetadata, GpsTagConstants.GPS_TAG_GPS_ALTITUDE_REF);
showTagValue(jpegMetadata, GpsTagConstants.GPS_TAG_GPS_ALTITUDE);
System.out.println();
// simple interface to GPS data
final TiffImageMetadata exifMetadata = jpegMetadata.getExif();
if (null != exifMetadata) {
final TiffImageMetadata.GPSInfo gpsInfo = exifMetadata.getGPS();
if (null != gpsInfo) {
final String gpsDescription = gpsInfo.toString();
final double longitude = gpsInfo.getLongitudeAsDegreesEast();
final double latitude = gpsInfo.getLatitudeAsDegreesNorth();
System.out.println(" " + "GPS Description: " + gpsDescription);
System.out.println(" " + "GPS Longitude (Degrees East): " + longitude);
System.out.println(" " + "GPS Latitude (Degrees North): " + latitude);
}
}
// more specific example of how to manually access GPS values
final TiffField gpsLatitudeRefField =
jpegMetadata.findEXIFValueWithExactMatch(GpsTagConstants.GPS_TAG_GPS_LATITUDE_REF);
final TiffField gpsLatitudeField =
jpegMetadata.findEXIFValueWithExactMatch(GpsTagConstants.GPS_TAG_GPS_LATITUDE);
final TiffField gpsLongitudeRefField =
jpegMetadata.findEXIFValueWithExactMatch(GpsTagConstants.GPS_TAG_GPS_LONGITUDE_REF);
final TiffField gpsLongitudeField =
jpegMetadata.findEXIFValueWithExactMatch(GpsTagConstants.GPS_TAG_GPS_LONGITUDE);
if (gpsLatitudeRefField != null
&& gpsLatitudeField != null
&& gpsLongitudeRefField != null
&& gpsLongitudeField != null) {
// all of these values are strings.
final String gpsLatitudeRef = (String) gpsLatitudeRefField.getValue();
final RationalNumber gpsLatitude[] = (RationalNumber[]) (gpsLatitudeField.getValue());
final String gpsLongitudeRef = (String) gpsLongitudeRefField.getValue();
final RationalNumber gpsLongitude[] = (RationalNumber[]) gpsLongitudeField.getValue();
final RationalNumber gpsLatitudeDegrees = gpsLatitude[0];
final RationalNumber gpsLatitudeMinutes = gpsLatitude[1];
final RationalNumber gpsLatitudeSeconds = gpsLatitude[2];
final RationalNumber gpsLongitudeDegrees = gpsLongitude[0];
final RationalNumber gpsLongitudeMinutes = gpsLongitude[1];
final RationalNumber gpsLongitudeSeconds = gpsLongitude[2];
// This will format the gps info like so:
//
// gpsLatitude: 8 degrees, 40 minutes, 42.2 seconds S
// gpsLongitude: 115 degrees, 26 minutes, 21.8 seconds E
System.out.println(
" "
+ "GPS Latitude: "
+ gpsLatitudeDegrees.toDisplayString()
+ " degrees, "
+ gpsLatitudeMinutes.toDisplayString()
+ " minutes, "
+ gpsLatitudeSeconds.toDisplayString()
+ " seconds "
+ gpsLatitudeRef);
System.out.println(
" "
+ "GPS Longitude: "
+ gpsLongitudeDegrees.toDisplayString()
+ " degrees, "
+ gpsLongitudeMinutes.toDisplayString()
+ " minutes, "
+ gpsLongitudeSeconds.toDisplayString()
+ " seconds "
+ gpsLongitudeRef);
}
System.out.println();
final List<ImageMetadataItem> items = jpegMetadata.getItems();
for (int i = 0; i < items.size(); i++) {
final ImageMetadataItem item = items.get(i);
System.out.println(" " + "item: " + item);
}
System.out.println();
}
}