/*
* ExifDescriptor.java
*
* This is public domain software - that is, you can do whatever you want
* with it, and include it software that is licensed under the GNU or the
* BSD license, or whatever other licence you choose, including proprietary
* closed source licenses. I do ask that you leave this header in tact.
*
* If you make modifications to this code that you think would benefit the
* wider community, please send me a copy and I'll post it on my site.
*
* If you make use of this code, I'd appreciate hearing about it.
* metadata_extractor [at] drewnoakes [dot] com
* Latest version of this software kept at
* http://drewnoakes.com/
*
* Created by dnoakes on 12-Nov-2002 22:27:15 using IntelliJ IDEA.
*/
package com.drew.metadata.exif;
import com.drew.imaging.PhotographicConversions;
import com.drew.lang.Rational;
import com.drew.metadata.Directory;
import com.drew.metadata.MetadataException;
import com.drew.metadata.TagDescriptor;
import java.io.UnsupportedEncodingException;
import java.text.DecimalFormat;
/**
* Provides human-readable string represenations of tag values stored in a <code>ExifDirectory</code>.
*/
public class ExifDescriptor extends TagDescriptor
{
/**
* Dictates whether rational values will be represented in decimal format in instances
* where decimal notation is elegant (such as 1/2 -> 0.5, but not 1/3).
*/
private boolean _allowDecimalRepresentationOfRationals = true;
private static final java.text.DecimalFormat SimpleDecimalFormatter = new DecimalFormat("0.#");
public ExifDescriptor(Directory directory)
{
super(directory);
}
// Note for the potential addition of brightness presentation in eV:
// Brightness of taken subject. To calculate Exposure(Ev) from BrigtnessValue(Bv),
// you must add SensitivityValue(Sv).
// Ev=BV+Sv Sv=log2(ISOSpeedRating/3.125)
// ISO100:Sv=5, ISO200:Sv=6, ISO400:Sv=7, ISO125:Sv=5.32.
/**
* Returns a descriptive value of the the specified tag for this image.
* Where possible, known values will be substituted here in place of the raw
* tokens actually kept in the Exif segment. If no substitution is
* available, the value provided by getString(int) will be returned.
* @param tagType the tag to find a description for
* @return a description of the image's value for the specified tag, or
* <code>null</code> if the tag hasn't been defined.
*/
public String getDescription(int tagType) throws MetadataException
{
switch (tagType) {
case ExifDirectory.TAG_ORIENTATION:
return getOrientationDescription();
case ExifDirectory.TAG_NEW_SUBFILE_TYPE:
return getNewSubfileTypeDescription();
case ExifDirectory.TAG_SUBFILE_TYPE:
return getSubfileTypeDescription();
case ExifDirectory.TAG_THRESHOLDING:
return getThresholdingDescription();
case ExifDirectory.TAG_FILL_ORDER:
return getFillOrderDescription();
case ExifDirectory.TAG_RESOLUTION_UNIT:
return getResolutionDescription();
case ExifDirectory.TAG_YCBCR_POSITIONING:
return getYCbCrPositioningDescription();
case ExifDirectory.TAG_EXPOSURE_TIME:
return getExposureTimeDescription();
case ExifDirectory.TAG_SHUTTER_SPEED:
return getShutterSpeedDescription();
case ExifDirectory.TAG_FNUMBER:
return getFNumberDescription();
case ExifDirectory.TAG_X_RESOLUTION:
return getXResolutionDescription();
case ExifDirectory.TAG_Y_RESOLUTION:
return getYResolutionDescription();
case ExifDirectory.TAG_THUMBNAIL_OFFSET:
return getThumbnailOffsetDescription();
case ExifDirectory.TAG_THUMBNAIL_LENGTH:
return getThumbnailLengthDescription();
case ExifDirectory.TAG_COMPRESSION_LEVEL:
return getCompressionLevelDescription();
case ExifDirectory.TAG_SUBJECT_DISTANCE:
return getSubjectDistanceDescription();
case ExifDirectory.TAG_METERING_MODE:
return getMeteringModeDescription();
case ExifDirectory.TAG_WHITE_BALANCE:
return getWhiteBalanceDescription();
case ExifDirectory.TAG_FLASH:
return getFlashDescription();
case ExifDirectory.TAG_FOCAL_LENGTH:
return getFocalLengthDescription();
case ExifDirectory.TAG_COLOR_SPACE:
return getColorSpaceDescription();
case ExifDirectory.TAG_EXIF_IMAGE_WIDTH:
return getExifImageWidthDescription();
case ExifDirectory.TAG_EXIF_IMAGE_HEIGHT:
return getExifImageHeightDescription();
case ExifDirectory.TAG_FOCAL_PLANE_UNIT:
return getFocalPlaneResolutionUnitDescription();
case ExifDirectory.TAG_FOCAL_PLANE_X_RES:
return getFocalPlaneXResolutionDescription();
case ExifDirectory.TAG_FOCAL_PLANE_Y_RES:
return getFocalPlaneYResolutionDescription();
case ExifDirectory.TAG_THUMBNAIL_IMAGE_WIDTH:
return getThumbnailImageWidthDescription();
case ExifDirectory.TAG_THUMBNAIL_IMAGE_HEIGHT:
return getThumbnailImageHeightDescription();
case ExifDirectory.TAG_BITS_PER_SAMPLE:
return getBitsPerSampleDescription();
case ExifDirectory.TAG_COMPRESSION:
return getCompressionDescription();
case ExifDirectory.TAG_PHOTOMETRIC_INTERPRETATION:
return getPhotometricInterpretationDescription();
case ExifDirectory.TAG_ROWS_PER_STRIP:
return getRowsPerStripDescription();
case ExifDirectory.TAG_STRIP_BYTE_COUNTS:
return getStripByteCountsDescription();
case ExifDirectory.TAG_SAMPLES_PER_PIXEL:
return getSamplesPerPixelDescription();
case ExifDirectory.TAG_PLANAR_CONFIGURATION:
return getPlanarConfigurationDescription();
case ExifDirectory.TAG_YCBCR_SUBSAMPLING:
return getYCbCrSubsamplingDescription();
case ExifDirectory.TAG_EXPOSURE_PROGRAM:
return getExposureProgramDescription();
case ExifDirectory.TAG_APERTURE:
return getApertureValueDescription();
case ExifDirectory.TAG_MAX_APERTURE:
return getMaxApertureValueDescription();
case ExifDirectory.TAG_SENSING_METHOD:
return getSensingMethodDescription();
case ExifDirectory.TAG_EXPOSURE_BIAS:
return getExposureBiasDescription();
case ExifDirectory.TAG_FILE_SOURCE:
return getFileSourceDescription();
case ExifDirectory.TAG_SCENE_TYPE:
return getSceneTypeDescription();
case ExifDirectory.TAG_COMPONENTS_CONFIGURATION:
return getComponentConfigurationDescription();
case ExifDirectory.TAG_EXIF_VERSION:
return getExifVersionDescription();
case ExifDirectory.TAG_FLASHPIX_VERSION:
return getFlashPixVersionDescription();
case ExifDirectory.TAG_REFERENCE_BLACK_WHITE:
return getReferenceBlackWhiteDescription();
case ExifDirectory.TAG_ISO_EQUIVALENT:
return getIsoEquivalentDescription();
case ExifDirectory.TAG_THUMBNAIL_DATA:
return getThumbnailDescription();
case ExifDirectory.TAG_USER_COMMENT:
return getUserCommentDescription();
case ExifDirectory.TAG_CUSTOM_RENDERED:
return getCustomRenderedDescription();
case ExifDirectory.TAG_EXPOSURE_MODE:
return getExposureModeDescription();
case ExifDirectory.TAG_WHITE_BALANCE_MODE:
return getWhiteBalanceModeDescription();
case ExifDirectory.TAG_DIGITAL_ZOOM_RATIO:
return getDigitalZoomRatioDescription();
case ExifDirectory.TAG_35MM_FILM_EQUIV_FOCAL_LENGTH:
return get35mmFilmEquivFocalLengthDescription();
case ExifDirectory.TAG_SCENE_CAPTURE_TYPE:
return getSceneCaptureTypeDescription();
case ExifDirectory.TAG_GAIN_CONTROL:
return getGainControlDescription();
case ExifDirectory.TAG_CONTRAST:
return getContrastDescription();
case ExifDirectory.TAG_SATURATION:
return getSaturationDescription();
case ExifDirectory.TAG_SHARPNESS:
return getSharpnessDescription();
case ExifDirectory.TAG_SUBJECT_DISTANCE_RANGE:
return getSubjectDistanceRangeDescription();
case ExifDirectory.TAG_WIN_AUTHOR:
return getWindowsAuthorDescription();
case ExifDirectory.TAG_WIN_COMMENT:
return getWindowsCommentDescription();
case ExifDirectory.TAG_WIN_KEYWORDS:
return getWindowsKeywordsDescription();
case ExifDirectory.TAG_WIN_SUBJECT:
return getWindowsSubjectDescription();
case ExifDirectory.TAG_WIN_TITLE:
return getWindowsTitleDescription();
default:
return _directory.getString(tagType);
}
}
public String getNewSubfileTypeDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_NEW_SUBFILE_TYPE)) return null;
switch (_directory.getInt(ExifDirectory.TAG_NEW_SUBFILE_TYPE)) {
case 1: return "Full-resolution image";
case 2: return "Reduced-resolution image";
case 3: return "Single page of multi-page reduced-resolution image";
case 4: return "Transparency mask";
case 5: return "Transparency mask of reduced-resolution image";
case 6: return "Transparency mask of multi-page image";
case 7: return "Transparency mask of reduced-resolution multi-page image";
default:
return "Unknown (" + _directory.getInt(ExifDirectory.TAG_NEW_SUBFILE_TYPE) + ")";
}
}
public String getSubfileTypeDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_SUBFILE_TYPE)) return null;
switch (_directory.getInt(ExifDirectory.TAG_SUBFILE_TYPE)) {
case 1: return "Full-resolution image";
case 2: return "Reduced-resolution image";
case 3: return "Single page of multi-page image";
default:
return "Unknown (" + _directory.getInt(ExifDirectory.TAG_SUBFILE_TYPE) + ")";
}
}
public String getThresholdingDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_THRESHOLDING)) return null;
switch (_directory.getInt(ExifDirectory.TAG_THRESHOLDING)) {
case 1: return "No dithering or halftoning";
case 2: return "Ordered dither or halftone";
case 3: return "Randomized dither";
default:
return "Unknown (" + _directory.getInt(ExifDirectory.TAG_THRESHOLDING) + ")";
}
}
public String getFillOrderDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_FILL_ORDER)) return null;
switch (_directory.getInt(ExifDirectory.TAG_FILL_ORDER)) {
case 1: return "Normal";
case 2: return "Reversed";
default:
return "Unknown (" + _directory.getInt(ExifDirectory.TAG_FILL_ORDER) + ")";
}
}
public String getSubjectDistanceRangeDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_SUBJECT_DISTANCE_RANGE)) return null;
switch (_directory.getInt(ExifDirectory.TAG_SUBJECT_DISTANCE_RANGE)) {
case 0:
return "Unknown";
case 1:
return "Macro";
case 2:
return "Close view";
case 3:
return "Distant view";
default:
return "Unknown (" + _directory.getInt(ExifDirectory.TAG_SUBJECT_DISTANCE_RANGE) + ")";
}
}
public String getSharpnessDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_SHARPNESS)) return null;
switch (_directory.getInt(ExifDirectory.TAG_SHARPNESS)) {
case 0:
return "None";
case 1:
return "Low";
case 2:
return "Hard";
default:
return "Unknown (" + _directory.getInt(ExifDirectory.TAG_SHARPNESS) + ")";
}
}
public String getSaturationDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_SATURATION)) return null;
switch (_directory.getInt(ExifDirectory.TAG_SATURATION)) {
case 0:
return "None";
case 1:
return "Low saturation";
case 2:
return "High saturation";
default:
return "Unknown (" + _directory.getInt(ExifDirectory.TAG_SATURATION) + ")";
}
}
public String getContrastDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_CONTRAST)) return null;
switch (_directory.getInt(ExifDirectory.TAG_CONTRAST)) {
case 0:
return "None";
case 1:
return "Soft";
case 2:
return "Hard";
default:
return "Unknown (" + _directory.getInt(ExifDirectory.TAG_CONTRAST) + ")";
}
}
public String getGainControlDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_GAIN_CONTROL)) return null;
switch (_directory.getInt(ExifDirectory.TAG_GAIN_CONTROL)) {
case 0:
return "None";
case 1:
return "Low gain up";
case 2:
return "Low gain down";
case 3:
return "High gain up";
case 4:
return "High gain down";
default:
return "Unknown (" + _directory.getInt(ExifDirectory.TAG_GAIN_CONTROL) + ")";
}
}
public String getSceneCaptureTypeDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_SCENE_CAPTURE_TYPE)) return null;
switch (_directory.getInt(ExifDirectory.TAG_SCENE_CAPTURE_TYPE)) {
case 0:
return "Standard";
case 1:
return "Landscape";
case 2:
return "Portrait";
case 3:
return "Night scene";
default:
return "Unknown (" + _directory.getInt(ExifDirectory.TAG_SCENE_CAPTURE_TYPE) + ")";
}
}
public String get35mmFilmEquivFocalLengthDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_35MM_FILM_EQUIV_FOCAL_LENGTH)) return null;
int equivalentFocalLength = _directory.getInt(ExifDirectory.TAG_35MM_FILM_EQUIV_FOCAL_LENGTH);
if (equivalentFocalLength==0)
return "Unknown";
else
return SimpleDecimalFormatter.format(equivalentFocalLength) + "mm";
}
public String getDigitalZoomRatioDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_DIGITAL_ZOOM_RATIO)) return null;
Rational rational = _directory.getRational(ExifDirectory.TAG_DIGITAL_ZOOM_RATIO);
if (rational.getNumerator()==0)
return "Digital zoom not used.";
return SimpleDecimalFormatter.format(rational.doubleValue());
}
public String getWhiteBalanceModeDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_WHITE_BALANCE_MODE)) return null;
switch (_directory.getInt(ExifDirectory.TAG_WHITE_BALANCE_MODE)) {
case 0:
return "Auto white balance";
case 1:
return "Manual white balance";
default:
return "Unknown (" + _directory.getInt(ExifDirectory.TAG_WHITE_BALANCE_MODE) + ")";
}
}
public String getExposureModeDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_EXPOSURE_MODE)) return null;
switch (_directory.getInt(ExifDirectory.TAG_EXPOSURE_MODE)) {
case 0:
return "Auto exposure";
case 1:
return "Manual exposure";
case 2:
return "Auto bracket";
default:
return "Unknown (" + _directory.getInt(ExifDirectory.TAG_EXPOSURE_MODE) + ")";
}
}
public String getCustomRenderedDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_CUSTOM_RENDERED)) return null;
switch (_directory.getInt(ExifDirectory.TAG_CUSTOM_RENDERED)) {
case 0:
return "Normal process";
case 1:
return "Custom process";
default:
return "Unknown (" + _directory.getInt(ExifDirectory.TAG_CUSTOM_RENDERED) + ")";
}
}
public String getUserCommentDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_USER_COMMENT)) return null;
byte[] commentBytes = _directory.getByteArray(ExifDirectory.TAG_USER_COMMENT);
if (commentBytes.length==0)
return "";
final String[] encodingNames = new String[] { "ASCII", "UNICODE", "JIS" };
if (commentBytes.length>=10)
{
String encodingRegion = new String(commentBytes, 0, 10);
// try each encoding name
for (int i = 0; i<encodingNames.length; i++) {
String encodingName = encodingNames[i];
if (encodingRegion.startsWith(encodingName))
{
// remove the null characters (and any spaces) commonly present after the encoding name
for (int j = encodingName.length(); j<10; j++) {
byte b = commentBytes[j];
if (b!='\0' && b!=' ') {
if (encodingName.equals("UNICODE")) {
try {
return new String(commentBytes, j, commentBytes.length - j, "UTF-16LE").trim();
}
catch (UnsupportedEncodingException ex) {
return null;
}
}
return new String(commentBytes, j, commentBytes.length - j).trim();
}
}
return new String(commentBytes, 10, commentBytes.length - 10).trim();
}
}
}
// special handling fell through, return a plain string representation
return new String(commentBytes).trim();
}
public String getThumbnailDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_THUMBNAIL_DATA)) return null;
int[] thumbnailBytes = _directory.getIntArray(ExifDirectory.TAG_THUMBNAIL_DATA);
return "[" + thumbnailBytes.length + " bytes of thumbnail data]";
}
public String getIsoEquivalentDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_ISO_EQUIVALENT)) return null;
int isoEquiv = _directory.getInt(ExifDirectory.TAG_ISO_EQUIVALENT);
if (isoEquiv < 50) {
isoEquiv *= 200;
}
return Integer.toString(isoEquiv);
}
public String getReferenceBlackWhiteDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_REFERENCE_BLACK_WHITE)) return null;
int[] ints = _directory.getIntArray(ExifDirectory.TAG_REFERENCE_BLACK_WHITE);
int blackR = ints[0];
int whiteR = ints[1];
int blackG = ints[2];
int whiteG = ints[3];
int blackB = ints[4];
int whiteB = ints[5];
String pos = "[" + blackR + "," + blackG + "," + blackB + "] " +
"[" + whiteR + "," + whiteG + "," + whiteB + "]";
return pos;
}
public String getExifVersionDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_EXIF_VERSION)) return null;
int[] ints = _directory.getIntArray(ExifDirectory.TAG_EXIF_VERSION);
return ExifDescriptor.convertBytesToVersionString(ints);
}
public String getFlashPixVersionDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_FLASHPIX_VERSION)) return null;
int[] ints = _directory.getIntArray(ExifDirectory.TAG_FLASHPIX_VERSION);
return ExifDescriptor.convertBytesToVersionString(ints);
}
public String getSceneTypeDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_SCENE_TYPE)) return null;
int sceneType = _directory.getInt(ExifDirectory.TAG_SCENE_TYPE);
if (sceneType == 1) {
return "Directly photographed image";
} else {
return "Unknown (" + sceneType + ")";
}
}
public String getFileSourceDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_FILE_SOURCE)) return null;
int fileSource = _directory.getInt(ExifDirectory.TAG_FILE_SOURCE);
if (fileSource == 3) {
return "Digital Still Camera (DSC)";
} else {
return "Unknown (" + fileSource + ")";
}
}
public String getExposureBiasDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_EXPOSURE_BIAS)) return null;
Rational exposureBias = _directory.getRational(ExifDirectory.TAG_EXPOSURE_BIAS);
return exposureBias.toSimpleString(true) + " EV";
}
public String getMaxApertureValueDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_MAX_APERTURE)) return null;
double aperture = _directory.getDouble(ExifDirectory.TAG_MAX_APERTURE);
double fStop = PhotographicConversions.apertureToFStop(aperture);
return "F" + SimpleDecimalFormatter.format(fStop);
}
public String getApertureValueDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_APERTURE)) return null;
double aperture = _directory.getDouble(ExifDirectory.TAG_APERTURE);
double fStop = PhotographicConversions.apertureToFStop(aperture);
return "F" + SimpleDecimalFormatter.format(fStop);
}
public String getExposureProgramDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_EXPOSURE_PROGRAM)) return null;
// '1' means manual control, '2' program normal, '3' aperture priority,
// '4' shutter priority, '5' program creative (slow program),
// '6' program action(high-speed program), '7' portrait mode, '8' landscape mode.
switch (_directory.getInt(ExifDirectory.TAG_EXPOSURE_PROGRAM)) {
case 1: return "Manual control";
case 2: return "Program normal";
case 3: return "Aperture priority";
case 4: return "Shutter priority";
case 5: return "Program creative (slow program)";
case 6: return "Program action (high-speed program)";
case 7: return "Portrait mode";
case 8: return "Landscape mode";
default:
return "Unknown program (" + _directory.getInt(ExifDirectory.TAG_EXPOSURE_PROGRAM) + ")";
}
}
public String getYCbCrSubsamplingDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_YCBCR_SUBSAMPLING)) return null;
int[] positions = _directory.getIntArray(ExifDirectory.TAG_YCBCR_SUBSAMPLING);
if (positions[0] == 2 && positions[1] == 1) {
return "YCbCr4:2:2";
} else if (positions[0] == 2 && positions[1] == 2) {
return "YCbCr4:2:0";
} else {
return "(Unknown)";
}
}
public String getPlanarConfigurationDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_PLANAR_CONFIGURATION)) return null;
// When image format is no compression YCbCr, this value shows byte aligns of YCbCr
// data. If value is '1', Y/Cb/Cr value is chunky format, contiguous for each subsampling
// pixel. If value is '2', Y/Cb/Cr value is separated and stored to Y plane/Cb plane/Cr
// plane format.
switch (_directory.getInt(ExifDirectory.TAG_PLANAR_CONFIGURATION)) {
case 1: return "Chunky (contiguous for each subsampling pixel)";
case 2: return "Separate (Y-plane/Cb-plane/Cr-plane format)";
default:
return "Unknown configuration";
}
}
public String getSamplesPerPixelDescription()
{
if (!_directory.containsTag(ExifDirectory.TAG_SAMPLES_PER_PIXEL)) return null;
return _directory.getString(ExifDirectory.TAG_SAMPLES_PER_PIXEL) + " samples/pixel";
}
public String getRowsPerStripDescription()
{
if (!_directory.containsTag(ExifDirectory.TAG_ROWS_PER_STRIP)) return null;
return _directory.getString(ExifDirectory.TAG_ROWS_PER_STRIP) + " rows/strip";
}
public String getStripByteCountsDescription()
{
if (!_directory.containsTag(ExifDirectory.TAG_STRIP_BYTE_COUNTS)) return null;
return _directory.getString(ExifDirectory.TAG_STRIP_BYTE_COUNTS) + " bytes";
}
public String getPhotometricInterpretationDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_PHOTOMETRIC_INTERPRETATION)) return null;
// Shows the color space of the image data components
switch (_directory.getInt(ExifDirectory.TAG_PHOTOMETRIC_INTERPRETATION)) {
case 0: return "WhiteIsZero";
case 1: return "BlackIsZero";
case 2: return "RGB";
case 3: return "RGB Palette";
case 4: return "Transparency Mask";
case 5: return "CMYK";
case 6: return "YCbCr";
case 8: return "CIELab";
case 9: return "ICCLab";
case 10: return "ITULab";
case 32803: return "Color Filter Array";
case 32844: return "Pixar LogL";
case 32845: return "Pixar LogLuv";
case 32892: return "Linear Raw";
default:
return "Unknown colour space";
}
}
public String getCompressionDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_COMPRESSION)) return null;
switch (_directory.getInt(ExifDirectory.TAG_COMPRESSION)) {
case 1: return "Uncompressed";
case 2: return "CCITT 1D";
case 3: return "T4/Group 3 Fax";
case 4: return "T6/Group 4 Fax";
case 5: return "LZW";
case 6: return "JPEG (old-style)";
case 7: return "JPEG";
case 8: return "Adobe Deflate";
case 9: return "JBIG B&W";
case 10: return "JBIG Color";
case 32766: return "Next";
case 32771: return "CCIRLEW";
case 32773: return "PackBits";
case 32809: return "Thunderscan";
case 32895: return "IT8CTPAD";
case 32896: return "IT8LW";
case 32897: return "IT8MP";
case 32898: return "IT8BL";
case 32908: return "PixarFilm";
case 32909: return "PixarLog";
case 32946: return "Deflate";
case 32947: return "DCS";
case 32661: return "JBIG";
case 32676: return "SGILog";
case 32677: return "SGILog24";
case 32712: return "JPEG 2000";
case 32713: return "Nikon NEF Compressed";
default:
return "Unknown compression";
}
}
public String getBitsPerSampleDescription()
{
if (!_directory.containsTag(ExifDirectory.TAG_BITS_PER_SAMPLE)) return null;
return _directory.getString(ExifDirectory.TAG_BITS_PER_SAMPLE) + " bits/component/pixel";
}
public String getThumbnailImageWidthDescription()
{
if (!_directory.containsTag(ExifDirectory.TAG_THUMBNAIL_IMAGE_WIDTH)) return null;
return _directory.getString(ExifDirectory.TAG_THUMBNAIL_IMAGE_WIDTH) + " pixels";
}
public String getThumbnailImageHeightDescription()
{
if (!_directory.containsTag(ExifDirectory.TAG_THUMBNAIL_IMAGE_HEIGHT)) return null;
return _directory.getString(ExifDirectory.TAG_THUMBNAIL_IMAGE_HEIGHT) + " pixels";
}
public String getFocalPlaneXResolutionDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_FOCAL_PLANE_X_RES)) return null;
Rational rational = _directory.getRational(ExifDirectory.TAG_FOCAL_PLANE_X_RES);
return rational.getReciprocal().toSimpleString(_allowDecimalRepresentationOfRationals) + " " +
getFocalPlaneResolutionUnitDescription().toLowerCase();
}
public String getFocalPlaneYResolutionDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_FOCAL_PLANE_Y_RES)) return null;
Rational rational = _directory.getRational(ExifDirectory.TAG_FOCAL_PLANE_Y_RES);
return rational.getReciprocal().toSimpleString(_allowDecimalRepresentationOfRationals) + " " +
getFocalPlaneResolutionUnitDescription().toLowerCase();
}
public String getFocalPlaneResolutionUnitDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_FOCAL_PLANE_UNIT)) return null;
// Unit of FocalPlaneXResoluton/FocalPlaneYResolution. '1' means no-unit,
// '2' inch, '3' centimeter.
switch (_directory.getInt(ExifDirectory.TAG_FOCAL_PLANE_UNIT)) {
case 1:
return "(No unit)";
case 2:
return "Inches";
case 3:
return "cm";
default:
return "";
}
}
public String getExifImageWidthDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_EXIF_IMAGE_WIDTH)) return null;
return _directory.getInt(ExifDirectory.TAG_EXIF_IMAGE_WIDTH) + " pixels";
}
public String getExifImageHeightDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_EXIF_IMAGE_HEIGHT)) return null;
return _directory.getInt(ExifDirectory.TAG_EXIF_IMAGE_HEIGHT) + " pixels";
}
public String getColorSpaceDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_COLOR_SPACE)) return null;
int colorSpace = _directory.getInt(ExifDirectory.TAG_COLOR_SPACE);
if (colorSpace == 1) {
return "sRGB";
} else if (colorSpace == 65535) {
return "Undefined";
} else {
return "Unknown";
}
}
public String getFocalLengthDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_FOCAL_LENGTH)) return null;
java.text.DecimalFormat formatter = new DecimalFormat("0.0##");
Rational focalLength = _directory.getRational(ExifDirectory.TAG_FOCAL_LENGTH);
return formatter.format(focalLength.doubleValue()) + " mm";
}
public String getFlashDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_FLASH)) return null;
/*
* This is a bitmask.
* 0 = flash fired
* 1 = return detected
* 2 = return able to be detected
* 3 = unknown
* 4 = auto used
* 5 = unknown
* 6 = red eye reduction used
*/
int val = _directory.getInt(ExifDirectory.TAG_FLASH);
StringBuffer sb = new StringBuffer();
if ((val & 0x1)!=0)
sb.append("Flash fired");
else
sb.append("Flash did not fire");
// check if we're able to detect a return, before we mention it
if ((val & 0x4)!=0)
{
if ((val & 0x2)!=0)
sb.append(", return detected");
else
sb.append(", return not detected");
}
if ((val & 0x10)!=0)
sb.append(", auto");
if ((val & 0x40)!=0)
sb.append(", red-eye reduction");
return sb.toString();
}
public String getWhiteBalanceDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_WHITE_BALANCE)) return null;
// '0' means unknown, '1' daylight, '2' fluorescent, '3' tungsten, '10' flash,
// '17' standard light A, '18' standard light B, '19' standard light C, '20' D55,
// '21' D65, '22' D75, '255' other.
switch (_directory.getInt(ExifDirectory.TAG_WHITE_BALANCE)) {
case 0:
return "Unknown";
case 1:
return "Daylight";
case 2:
return "Flourescent";
case 3:
return "Tungsten";
case 10:
return "Flash";
case 17:
return "Standard light";
case 18:
return "Standard light (B)";
case 19:
return "Standard light (C)";
case 20:
return "D55";
case 21:
return "D65";
case 22:
return "D75";
case 255:
return "(Other)";
default:
return "Unknown (" + _directory.getInt(ExifDirectory.TAG_WHITE_BALANCE) + ")";
}
}
public String getMeteringModeDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_METERING_MODE)) return null;
// '0' means unknown, '1' average, '2' center weighted average, '3' spot
// '4' multi-spot, '5' multi-segment, '6' partial, '255' other
int meteringMode = _directory.getInt(ExifDirectory.TAG_METERING_MODE);
switch (meteringMode) {
case 0:
return "Unknown";
case 1:
return "Average";
case 2:
return "Center weighted average";
case 3:
return "Spot";
case 4:
return "Multi-spot";
case 5:
return "Multi-segment";
case 6:
return "Partial";
case 255:
return "(Other)";
default:
return "";
}
}
public String getSubjectDistanceDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_SUBJECT_DISTANCE)) return null;
Rational distance = _directory.getRational(ExifDirectory.TAG_SUBJECT_DISTANCE);
java.text.DecimalFormat formatter = new DecimalFormat("0.0##");
return formatter.format(distance.doubleValue()) + " metres";
}
public String getCompressionLevelDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_COMPRESSION_LEVEL)) return null;
Rational compressionRatio = _directory.getRational(ExifDirectory.TAG_COMPRESSION_LEVEL);
String ratio = compressionRatio.toSimpleString(_allowDecimalRepresentationOfRationals);
if (compressionRatio.isInteger() && compressionRatio.intValue() == 1) {
return ratio + " bit/pixel";
} else {
return ratio + " bits/pixel";
}
}
public String getThumbnailLengthDescription()
{
if (!_directory.containsTag(ExifDirectory.TAG_THUMBNAIL_LENGTH)) return null;
return _directory.getString(ExifDirectory.TAG_THUMBNAIL_LENGTH) + " bytes";
}
public String getThumbnailOffsetDescription()
{
if (!_directory.containsTag(ExifDirectory.TAG_THUMBNAIL_OFFSET)) return null;
return _directory.getString(ExifDirectory.TAG_THUMBNAIL_OFFSET) + " bytes";
}
public String getYResolutionDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_Y_RESOLUTION)) return null;
Rational resolution = _directory.getRational(ExifDirectory.TAG_Y_RESOLUTION);
return resolution.toSimpleString(_allowDecimalRepresentationOfRationals) +
" dots per " +
getResolutionDescription().toLowerCase();
}
public String getXResolutionDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_X_RESOLUTION)) return null;
Rational resolution = _directory.getRational(ExifDirectory.TAG_X_RESOLUTION);
return resolution.toSimpleString(_allowDecimalRepresentationOfRationals) +
" dots per " +
getResolutionDescription().toLowerCase();
}
public String getExposureTimeDescription()
{
if (!_directory.containsTag(ExifDirectory.TAG_EXPOSURE_TIME)) return null;
return _directory.getString(ExifDirectory.TAG_EXPOSURE_TIME) + " sec";
}
public String getShutterSpeedDescription() throws MetadataException
{
// I believe this method to now be stable, but am leaving some alternative snippets of
// code in here, to assist anyone who's looking into this (given that I don't have a public CVS).
if (!_directory.containsTag(ExifDirectory.TAG_SHUTTER_SPEED)) return null;
// float apexValue = _directory.getFloat(ExifDirectory.TAG_SHUTTER_SPEED);
// int apexPower = (int)Math.pow(2.0, apexValue);
// return "1/" + apexPower + " sec";
// TODO test this method
// thanks to Mark Edwards for spotting and patching a bug in the calculation of this
// description (spotted bug using a Canon EOS 300D)
// thanks also to Gli Blr for spotting this bug
float apexValue = _directory.getFloat(ExifDirectory.TAG_SHUTTER_SPEED);
if (apexValue<=1) {
float apexPower = (float)(1/(Math.exp(apexValue*Math.log(2))));
long apexPower10 = Math.round((double)apexPower * 10.0);
float fApexPower = (float) apexPower10 / 10.0f;
return fApexPower + " sec";
} else {
int apexPower = (int)((Math.exp(apexValue*Math.log(2))));
return "1/" + apexPower + " sec";
}
/*
// This alternative implementation offered by Bill Richards
// TODO determine which is the correct / more-correct implementation
double apexValue = _directory.getDouble(ExifDirectory.TAG_SHUTTER_SPEED);
double apexPower = Math.pow(2.0, apexValue);
StringBuffer sb = new StringBuffer();
if (apexPower > 1)
apexPower = Math.floor(apexPower);
if (apexPower < 1) {
sb.append((int)Math.round(1/apexPower));
} else {
sb.append("1/");
sb.append((int)apexPower);
}
sb.append(" sec");
return sb.toString();
*/
}
public String getFNumberDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_FNUMBER)) return null;
Rational fNumber = _directory.getRational(ExifDirectory.TAG_FNUMBER);
return "F" + SimpleDecimalFormatter.format(fNumber.doubleValue());
}
public String getYCbCrPositioningDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_YCBCR_POSITIONING)) return null;
int yCbCrPosition = _directory.getInt(ExifDirectory.TAG_YCBCR_POSITIONING);
switch (yCbCrPosition) {
case 1: return "Center of pixel array";
case 2: return "Datum point";
default:
return String.valueOf(yCbCrPosition);
}
}
public String getOrientationDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_ORIENTATION)) return null;
int orientation = _directory.getInt(ExifDirectory.TAG_ORIENTATION);
switch (orientation) {
case 1: return "Top, left side (Horizontal / normal)";
case 2: return "Top, right side (Mirror horizontal)";
case 3: return "Bottom, right side (Rotate 180)";
case 4: return "Bottom, left side (Mirror vertical)";
case 5: return "Left side, top (Mirror horizontal and rotate 270 CW)";
case 6: return "Right side, top (Rotate 90 CW)";
case 7: return "Right side, bottom (Mirror horizontal and rotate 90 CW)";
case 8: return "Left side, bottom (Rotate 270 CW)";
default:
return String.valueOf(orientation);
}
}
public String getResolutionDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_RESOLUTION_UNIT)) return "";
// '1' means no-unit, '2' means inch, '3' means centimeter. Default value is '2'(inch)
int resolutionUnit = _directory.getInt(ExifDirectory.TAG_RESOLUTION_UNIT);
switch (resolutionUnit) {
case 1: return "(No unit)";
case 2: return "Inch";
case 3: return "cm";
default:
return "";
}
}
public String getSensingMethodDescription() throws MetadataException
{
if (!_directory.containsTag(ExifDirectory.TAG_SENSING_METHOD)) return null;
// '1' Not defined, '2' One-chip color area sensor, '3' Two-chip color area sensor
// '4' Three-chip color area sensor, '5' Color sequential area sensor
// '7' Trilinear sensor '8' Color sequential linear sensor, 'Other' reserved
int sensingMethod = _directory.getInt(ExifDirectory.TAG_SENSING_METHOD);
switch (sensingMethod) {
case 1:
return "(Not defined)";
case 2:
return "One-chip color area sensor";
case 3:
return "Two-chip color area sensor";
case 4:
return "Three-chip color area sensor";
case 5:
return "Color sequential area sensor";
case 7:
return "Trilinear sensor";
case 8:
return "Color sequential linear sensor";
default:
return "";
}
}
public String getComponentConfigurationDescription() throws MetadataException
{
int[] components = _directory.getIntArray(ExifDirectory.TAG_COMPONENTS_CONFIGURATION);
String[] componentStrings = {"", "Y", "Cb", "Cr", "R", "G", "B"};
StringBuffer componentConfig = new StringBuffer();
for (int i = 0; i < Math.min(4, components.length); i++) {
int j = components[i];
if (j > 0 && j < componentStrings.length) {
componentConfig.append(componentStrings[j]);
}
}
return componentConfig.toString();
}
/**
* Takes a series of 4 bytes from the specified offset, and converts these to a
* well-known version number, where possible. For example, (hex) 30 32 31 30 == 2.10).
* @param components the four version values
* @return the version as a string of form 2.10
*/
public static String convertBytesToVersionString(int[] components)
{
StringBuffer version = new StringBuffer();
for (int i = 0; i < 4 && i < components.length; i++) {
if (i == 2) version.append('.');
String digit = String.valueOf((char)components[i]);
if (i == 0 && "0".equals(digit)) continue;
version.append(digit);
}
return version.toString();
}
/**
* The Windows specific tags uses plain Unicode
*/
private String getUnicodeDescription(int tag) throws MetadataException
{
if (!_directory.containsTag(tag)) return null;
byte[] commentBytes = _directory.getByteArray(tag);
try {
// decode the unicode string
// trim it, as i'm seeing a junk character on the end
return new String(commentBytes, "UTF-16LE").trim();
}
catch (UnsupportedEncodingException ex) {
return null;
}
}
public String getWindowsAuthorDescription() throws MetadataException
{
return getUnicodeDescription(ExifDirectory.TAG_WIN_AUTHOR);
}
public String getWindowsCommentDescription() throws MetadataException
{
return getUnicodeDescription(ExifDirectory.TAG_WIN_COMMENT);
}
public String getWindowsKeywordsDescription() throws MetadataException
{
return getUnicodeDescription(ExifDirectory.TAG_WIN_KEYWORDS);
}
public String getWindowsTitleDescription() throws MetadataException
{
return getUnicodeDescription(ExifDirectory.TAG_WIN_TITLE);
}
public String getWindowsSubjectDescription() throws MetadataException
{
return getUnicodeDescription(ExifDirectory.TAG_WIN_SUBJECT);
}
}