/* exif-tag.c
 *
 * Copyright (C) 2001 Lutz Müller <lutz@users.sourceforge.net>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, 
 * but WITHOUT ANY WARRANTY; without even the implied warranty of 
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details. 
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include "config.h"
#include "exif-tag.h"
#include "i18n.h"

#include <stdlib.h>

static struct
{
    ExifTag tag;
    const char *name;
    const char *title;
    const char *description;
}
ExifTagTable[] =
{
    {
    EXIF_TAG_INTEROPERABILITY_INDEX, "InteroperabilityIndex",
	    "InteroperabilityIndex",
	    N_
	    ("Indicates the identification of the Interoperability rule. "
		 "Use \"R98\" for stating ExifR98 Rules. Four bytes used "
		 "including the termination code (NULL). see the separate "
		 "volume of Recommended Exif Interoperability Rules (ExifR98) "
		 "for other tags used for ExifR98.")}
    ,
    {
    EXIF_TAG_INTEROPERABILITY_VERSION, "InteroperabilityVersion",
	    "InteroperabilityVersion", ""}
    ,
    {
    EXIF_TAG_IMAGE_WIDTH, "ImageWidth", N_("Image Width"),
	    N_
	    ("The number of colums of image data, equal to the number of "
		 "pixels per row. In JPEG compressed data a JPEG marker is "
		 "used instead of this tag.")}
    ,
    {
    EXIF_TAG_IMAGE_LENGTH, "ImageLength", N_("Image Length"),
	    N_
	    ("The number of rows of image data. In JPEG compressed data a "
		 "JPEG marker is used instead of this tag.")}
    ,
    {
    EXIF_TAG_BITS_PER_SAMPLE, "BitsPerSample", N_("Bits per Sample"),
	    N_
	    ("The number of bits per image component. In this standard each "
		 "component of the image is 8 bits, so the value for this "
		 "tag is 9. See also <SamplesPerPixel>. In JPEG compressed data "
		 "a JPEG marker is used instead of this tag.")}
    ,
    {
    EXIF_TAG_COMPRESSION, "Compression", N_("Compression"),
	    N_("The compression scheme used for the image data. When a "
		   "primary image is JPEG compressed, this designation is "
		   "not necessary and is omitted. When thumbnails use JPEG "
		   "compression, this tag value is set to 6.")}
    ,
    {
    EXIF_TAG_PHOTOMETRIC_INTERPRETATION, "PhotometricInterpretation",
	    N_("Photometric Interpretation"),
	    N_("The pixel composition. In JPEG compressed data a JPEG "
		   "marker is used instead of this tag.")}
    ,
    {
    EXIF_TAG_FILL_ORDER, "FillOrder", N_("Fill Order"), ""}
    ,
    {
    EXIF_TAG_DOCUMENT_NAME, "DocumentName", N_("Document Name"), ""}
    ,
    {
    EXIF_TAG_IMAGE_DESCRIPTION, "ImageDescription",
	    N_("Image Description"),
	    N_
	    ("A character string giving the title of the image. It may be "
		 "a comment such as \"1988 company picnic\" or "
		 "the like. Two-bytes character codes cannot be used. "
		 "When a 2-bytes code is necessary, the Exif Private tag "
		 "<UserComment> is to be used.")}
    ,
    {
    EXIF_TAG_MAKE, "Make", N_("Manufacturer"),
	    N_("The manufacturer of the recording "
		   "equipment. This is the manufacturer of the DSC, scanner, "
		   "video digitizer or other equipment that generated the "
		   "image. When the field is left blank, it is treated as "
		   "unknown.")}
    ,
    {
    EXIF_TAG_MODEL, "Model", N_("Model"),
	    N_
	    ("The model name or model number of the equipment. This is the "
		 "model name or number of the DSC, scanner, video digitizer "
		 "or other equipment that generated the image. When the field "
		 "is left blank, it is treated as unknown.")}
    ,
    {
    EXIF_TAG_STRIP_OFFSETS, "StripOffsets", N_("Strip Offsets"),
	    N_("For each strip, the byte offset of that strip. It is "
		   "recommended that this be selected so the number of strip "
		   "bytes does not exceed 64 Kbytes. With JPEG compressed "
		   "data this designation is not needed and is omitted. See also "
		   "<RowsPerStrip> and <StripByteCounts>.")}
    ,
    {
    EXIF_TAG_ORIENTATION, "Orientation", N_("Orientation"),
	    N_("The image orientation viewed in terms of rows and colums.")}
    ,
    {
    EXIF_TAG_SAMPLES_PER_PIXEL, "SamplesPerPixel",
	    N_("Samples per Pixel"),
	    N_
	    ("The number of components per pixel. Since this standard applies "
		 "to RGB and YCbCr images, the value set for this tag is 3. "
		 "In JPEG compressed data a JPEG marker is used instead of this "
		 "tag.")}
    ,
    {
    EXIF_TAG_ROWS_PER_STRIP, "RowsPerStrip", N_("Rows per Strip"),
	    N_("The number of rows per strip. This is the number of rows "
		   "in the image of one strip when an image is divided into "
		   "strips. With JPEG compressed data this designation is not "
		   "needed and is omitted. See also <RowsPerStrip> and "
		   "<StripByteCounts>.")}
    ,
    {
    EXIF_TAG_STRIP_BYTE_COUNTS, "StripByteCounts", N_("Strip Byte Count"),
	    N_
	    ("The total number of bytes in each strip. With JPEG compressed "
		 "data this designation is not needed and is omitted.")}
    ,
    {
    EXIF_TAG_X_RESOLUTION, "XResolution", N_("x-Resolution"),
	    N_
	    ("The number of pixels per <ResolutionUnit> in the <ImageWidth> "
		 "direction. When the image resolution is unknown, 72 [dpi] "
		 "is designated.")}
    ,
    {
    EXIF_TAG_Y_RESOLUTION, "YResolution", N_("y-Resolution"),
	    N_
	    ("The number of pixels per <ResolutionUnit> in the <ImageLength> "
		 "direction. The same value as <XResolution> is designated.")}
    ,
    {
    EXIF_TAG_PLANAR_CONFIGURATION, "PlanarConfiguration",
	    N_("Planar Configuration"),
	    N_
	    ("Indicates whether pixel components are recorded in a chunky "
		 "or planar format. In JPEG compressed files a JPEG marker "
		 "is used instead of this tag. If this field does not exist, "
		 "the TIFF default of 1 (chunky) is assumed.")}
    ,
    {
    EXIF_TAG_RESOLUTION_UNIT, "ResolutionUnit", N_("Resolution Unit"),
	    N_
	    ("The unit for measuring <XResolution> and <YResolution>. The same "
		 "unit is used for both <XResolution> and <YResolution>. If "
		 "the image resolution is unknown, 2 (inches) is designated.")}
    ,
    {
    EXIF_TAG_TRANSFER_FUNCTION, "TransferFunction",
	    N_("Transfer Function"),
	    N_
	    ("A transfer function for the image, described in tabular style. "
		 "Normally this tag is not necessary, since color space is "
		 "specified in the color space information tag (<ColorSpace>).")}
    ,
    {
    EXIF_TAG_SOFTWARE, "Software", N_("Software"),
	    N_("This tag records the name and version of the software or "
		   "firmware of the camera or image input device used to "
		   "generate the image. The detailed format is not specified, but "
		   "it is recommended that the example shown below be "
		   "followed. When the field is left blank, it is treated as "
		   "unknown.")}
    ,
    {
    EXIF_TAG_DATE_TIME, "DateTime", N_("Date and Time"),
	    N_("The date and time of image creation. In this standard "
		   "(EXIF-2.1) it is the date and time the file was changed.")}
    ,
    {
    EXIF_TAG_ARTIST, "Artist", N_("Artist"),
	    N_
	    ("This tag records the name of the camera owner, photographer or "
		 "image creator. The detailed format is not specified, but it is "
		 "recommended that the information be written as in the example "
		 "below for ease of Interoperability. When the field is "
		 "left blank, it is treated as unknown.")}
    ,
    {
    EXIF_TAG_WHITE_POINT, "WhitePoint", N_("White Point"),
	    N_
	    ("The chromaticity of the white point of the image. Normally "
		 "this tag is not necessary, since color space is specified "
		 "in the colorspace information tag (<ColorSpace>).")}
    ,
    {
    EXIF_TAG_PRIMARY_CHROMATICITIES, "PrimaryChromaticities",
	    N_("Primary Chromaticities"),
	    N_
	    ("The chromaticity of the three primary colors of the image. "
		 "Normally this tag is not necessary, since colorspace is "
		 "specified in the colorspace information tag (<ColorSpace>).")}
    ,
    {
    EXIF_TAG_TRANSFER_RANGE, "TransferRange", N_("Transfer Range"), ""}
    ,
    {
    EXIF_TAG_JPEG_PROC, "JPEGProc", "JPEGProc", ""}
    ,
    {
    EXIF_TAG_JPEG_INTERCHANGE_FORMAT, "JPEGInterchangeFormat",
	    N_("JPEG Interchange Format"),
	    N_("The offset to the start byte (SOI) of JPEG compressed "
		   "thumbnail data. This is not used for primary image "
		   "JPEG data.")}
    ,
    {
    EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH,
	    "JPEGInterchangeFormatLength",
	    N_("JPEG Interchange Format Length"),
	    N_
	    ("The number of bytes of JPEG compressed thumbnail data. This "
		 "is not used for primary image JPEG data. JPEG thumbnails "
		 "are not divided but are recorded as a continuous JPEG "
		 "bitstream from SOI to EOI. Appn and COM markers should "
		 "not be recorded. Compressed thumbnails must be recorded in no "
		 "more than 64 Kbytes, including all other data to be "
		 "recorded in APP1.")}
    ,
    {
    EXIF_TAG_YCBCR_COEFFICIENTS, "YCbCrCoefficients",
	    N_("YCbCr Coefficients"),
	    N_
	    ("The matrix coefficients for transformation from RGB to YCbCr "
		 "image data. No default is given in TIFF; but here the "
		 "value given in Appendix E, \"Color Space Guidelines\", is used "
		 "as the default. The color space is declared in a "
		 "color space information tag, with the default being the value "
		 "that gives the optimal image characteristics "
		 "Interoperability this condition.")}
    ,
    {
    EXIF_TAG_YCBCR_SUB_SAMPLING, "YCbCrSubSampling",
	    N_("YCbCr Sub-Sampling"),
	    N_
	    ("The sampling ratio of chrominance components in relation to the "
		 "luminance component. In JPEG compressed data a JPEG marker "
		 "is used instead of this tag.")}
    ,
    {
    EXIF_TAG_YCBCR_POSITIONING, "YCbCrPositioning",
	    N_("YCbCr Positioning"),
	    N_
	    ("The position of chrominance components in relation to the "
		 "luminance component. This field is designated only for "
		 "JPEG compressed data or uncompressed YCbCr data. The TIFF "
		 "default is 1 (centered); but when Y:Cb:Cr = 4:2:2 it is "
		 "recommended in this standard that 2 (co-sited) be used to "
		 "record data, in order to improve the image quality when viewed "
		 "on TV systems. When this field does not exist, the reader shall "
		 "assume the TIFF default. In the case of Y:Cb:Cr = 4:2:0, the "
		 "TIFF default (centered) is recommended. If the reader "
		 "does not have the capability of supporting both kinds of "
		 "<YCbCrPositioning>, it shall follow the TIFF default regardless "
		 "of the value in this field. It is preferable that readers "
		 "be able to support both centered and co-sited positioning.")}
    ,
    {
    EXIF_TAG_REFERENCE_BLACK_WHITE, "ReferenceBlackWhite",
	    N_("Reference Black/White"),
	    N_
	    ("The reference black point value and reference white point "
		 "value. No defaults are given in TIFF, but the values "
		 "below are given as defaults here. The color space is declared "
		 "in a color space information tag, with the default "
		 "being the value that gives the optimal image characteristics "
		 "Interoperability these conditions.")}
    ,
    {
    EXIF_TAG_RELATED_IMAGE_FILE_FORMAT, "RelatedImageFileFormat",
	    "RelatedImageFileFormat", ""}
    ,
    {
    EXIF_TAG_RELATED_IMAGE_WIDTH, "RelatedImageWidth",
	    "RelatedImageWidth", ""}
    ,
    {
    EXIF_TAG_RELATED_IMAGE_LENGTH, "RelatedImageLength",
	    "RelatedImageLength", ""}
    ,
    {
    EXIF_TAG_CFA_REPEAT_PATTERN_DIM, "CFARepeatPatternDim",
	    "CFARepeatPatternDim", ""}
    ,
    {
    EXIF_TAG_CFA_PATTERN, "CFAPattern",
	    N_("CFA Pattern"),
	    N_
	    ("Indicates the color filter array (CFA) geometric pattern of the "
		 "image sensor when a one-chip color area sensor is used. "
		 "It does not apply to all sensing methods.")}
    ,
    {
    EXIF_TAG_BATTERY_LEVEL, "BatteryLevel", N_("Battery Level"), ""}
    ,
    {
    EXIF_TAG_COPYRIGHT, "Copyright", N_("Copyright"),
	    N_
	    ("Copyright information. In this standard the tag is used to "
		 "indicate both the photographer and editor copyrights. It is "
		 "the copyright notice of the person or organization claiming "
		 "rights to the image. The Interoperability copyright "
		 "statement including date and rights should be written in this "
		 "field; e.g., \"Copyright, John Smith, 19xx. All rights "
		 "reserved.\". In this standard the field records both the "
		 "photographer and editor copyrights, with each recorded in a "
		 "separate part of the statement. When there is a clear "
		 "distinction between the photographer and editor copyrights, "
		 "these are to be written in the order of photographer followed "
		 "by editor copyright, separated by NULL (in this case, "
		 "since the statement also ends with a NULL, there are two NULL "
		 "codes) (see example 1). When only the photographer is given, "
		 "it is terminated by one NULL code (see example 2). When only "
		 "the editor copyright is given, "
		 "the photographer copyright part consists of one space followed "
		 "by a terminating NULL code, then the editor copyright is given "
		 "(see example 3). When the field is left blank, it is treated "
		 "as unknown.")}
    ,
    {
    EXIF_TAG_EXPOSURE_TIME, "ExposureTime", N_("Exposure Time"),
	    N_("Exposure time, given in seconds (sec).")}
    ,
    {
    EXIF_TAG_FNUMBER, "FNumber", "FNumber", N_("The F number.")}
    ,
    {
    EXIF_TAG_IPTC_NAA, "IPTC/NAA", "IPTC/NAA", ""}
    ,
    {
    EXIF_TAG_EXIF_IFD_POINTER, "ExifIFDPointer", "ExifIFDPointer",
	    N_
	    ("A pointer to the Exif IFD. Interoperability, Exif IFD has the "
		 "same structure as that of the IFD specified in TIFF. "
		 "ordinarily, however, it does not contain image data as in "
		 "the case of TIFF.")}
    ,
    {
    EXIF_TAG_INTER_COLOR_PROFILE, "InterColorProfile",
	    "InterColorProfile", ""}
    ,
    {
    EXIF_TAG_EXPOSURE_PROGRAM, "ExposureProgram", "ExposureProgram",
	    N_
	    ("The class of the program used by the camera to set exposure "
		 "when the picture is taken.")}
    ,
    {
    EXIF_TAG_SPECTRAL_SENSITIVITY, "SpectralSensitivity",
	    N_("Spectral Sensitivity"),
	    N_
	    ("Indicates the spectral sensitivity of each channel of the "
		 "camera used. The tag value is an ASCII string compatible "
		 "with the standard developed by the ASTM Technical committee.")}
    ,
    {
    EXIF_TAG_GPS_INFO_IFD_POINTER, "GPSInfoIFDPointer",
	    "GPSInfoIFDPointer",
	    N_("A pointer to the GPS Info IFD. The "
		   "Interoperability structure of the GPS Info IFD, like that of "
		   "Exif IFD, has no image data.")}
    ,
#if 0
    {
    EXIF_TAG_GPS_VERSION_ID, "GPSVersionID", "",
	    N_
	    ("Indicates the version of <GPSInfoIFD>. The version is given "
		 "as 2.0.0.0. This tag is mandatory when <GPSInfo> tag is "
		 "present. (Note: The <GPSVersionID tag is given in bytes, "
		 "unlike the <ExifVersion> tag. When the version is "
		 "2.0.0.0, the tag value is 02000000.H).")}
    ,
    {
    EXIF_TAG_GPS_LATITUDE_REF, "GPSLatitudeRef", ""
	    N_
	    ("Indicates whether the latitude is north or south latitude. The "
		 "ASCII value 'N' indicates north latitude, and 'S' is south "
		 "latitude.")}
    ,
    {
    EXIF_TAG_GPS_LATITUDE, "GPSLatitude", ""
	    N_
	    ("Indicates the latitude. The latitude is expressed as three "
		 "RATIONAL values giving the degrees, minutes, and seconds, "
		 "respectively. When degrees, minutes and seconds are expressed, "
		 "the format is dd/1,mm/1,ss/1. When degrees and minutes are used "
		 "and, for example, fractions of minutes are given up to two "
		 "two decimal places, the format is dd/1,mmmm/100,0/1.")}
    ,
    {
    EXIF_TAG_GPS_LONGITUDE_REF, "GPSLongitudeRef", ""
	    N_
	    ("Indicates whether the longitude is east or west longitude. "
		 "ASCII 'E' indicates east longitude, and 'W' is west "
		 "longitude.")}
    ,
    {
    EXIF_TAG_GPS_LONGITUDE, "GPSLongitude", ""
	    N_
	    ("Indicates the longitude. The longitude is expressed as three "
		 "RATIONAL values giving the degrees, minutes, and seconds, "
		 "respectively. When degrees, minutes and seconds are expressed, "
		 "the format is ddd/1,mm/1,ss/1. When degrees and minutes are "
		 "used and, for example, fractions of minutes are given up to "
		 "two decimal places, the format is ddd/1,mmmm/100,0/1.")}
    ,
#endif
    {
    EXIF_TAG_ISO_SPEED_RATINGS, "ISOSpeedRatings",
	    N_("ISO Speed Ratings"),
	    N_
	    ("Indicates the ISO Speed and ISO Latitude of the camera or "
		 "input device as specified in ISO 12232.")}
    ,
    {
    EXIF_TAG_OECF, "OECF", "OECF",
	    N_("Indicates the Opto-Electoric Conversion Function (OECF) "
		   "specified in ISO 14524. <OECF> is the relationship between "
		   "the camera optical input and the image values.")}
    ,
    {
    EXIF_TAG_EXIF_VERSION, "ExifVersion", N_("Exif Version"),
	    N_
	    ("The version of this standard supported. Nonexistence of this "
		 "field is taken to mean nonconformance to the standard.")}
    ,
    {
    EXIF_TAG_DATE_TIME_ORIGINAL, "DateTimeOriginal",
	    N_("Date and Time (original)"),
	    N_
	    ("The date and time when the original image data was generated. "
		 "For a digital still camera "
		 "the date and time the picture was taken are recorded.")}
    ,
    {
    EXIF_TAG_DATE_TIME_DIGITIZED, "DateTimeDigitized",
	    N_("Date and Time (digitized)"),
	    N_
	    ("The date and time when the image was stored as digital data. ")}
    ,
    {
    EXIF_TAG_COMPONENTS_CONFIGURATION, "ComponentsConfiguration",
	    "ComponentsConfiguration",
	    N_("Information specific to compressed data. The channels of "
		   "each component are arranged in order from the 1st "
		   "component to the 4th. For uncompressed data the data "
		   "arrangement is given in the <PhotometricInterpretation> tag. "
		   "However, since <PhotometricInterpretation> can only "
		   "express the order of Y, Cb and Cr, this tag is provided "
		   "for cases when compressed data uses components other than "
		   "Y, Cb, and Cr and to enable support of other sequences.")}
    ,
    {
    EXIF_TAG_COMPRESSED_BITS_PER_PIXEL, "CompressedBitsPerPixel",
	    N_("Compressed Bits per Pixel"),
	    N_
	    ("Information specific to compressed data. The compression mode "
		 "used for a compressed image is indicated in unit bits "
		 "per pixel.")}
    ,
    {
    EXIF_TAG_SHUTTER_SPEED_VALUE, "ShutterSpeedValue",
	    N_("Shutter speed"),
	    N_("Shutter speed. The unit is the APEX (Additive System of "
		   "Photographic Exposure) setting (see Appendix C).")}
    ,
    {
    EXIF_TAG_APERTURE_VALUE, "ApertureValue", N_("Aperture"),
	    N_("The lens aperture. The unit is the APEX value.")}
    ,
    {
    EXIF_TAG_BRIGHTNESS_VALUE, "BrightnessValue", N_("Brightness"),
	    N_("The value of brightness. The unit is the APEX value. "
		   "Ordinarily it is given in the range of -99.99 to 99.99.")}
    ,
    {
    EXIF_TAG_EXPOSURE_BIAS_VALUE, "ExposureBiasValue",
	    N_("Exposure Bias"),
	    N_
	    ("The exposure bias. The units is the APEX value. Ordinarily "
		 "it is given in the range of -99.99 to 99.99.")}
    ,
    {
    EXIF_TAG_MAX_APERTURE_VALUE, "MaxApertureValue", "MaxApertureValue",
	    N_
	    ("The smallest F number of the lens. The unit is the APEX value. "
		 "Ordinarily it is given in the range of 00.00 to 99.99, "
		 "but it is not limited to this range.")}
    ,
    {
    EXIF_TAG_SUBJECT_DISTANCE, "SubjectDistance",
	    N_("Subject Distance"),
	    N_("The distance to the subject, given in meters.")}
    ,
    {
    EXIF_TAG_METERING_MODE, "MeteringMode", N_("Metering Mode"),
	    N_("The metering mode.")}
    ,
    {
    EXIF_TAG_LIGHT_SOURCE, "LightSource", N_("Light Source"),
	    N_("The kind of light source.")}
    ,
    {
    EXIF_TAG_FLASH, "Flash", N_("Flash"),
	    N_
	    ("This tag is recorded when an image is taken using a strobe "
		 "light (flash).")}
    ,
    {
    EXIF_TAG_FOCAL_LENGTH, "FocalLength", N_("Focal Length"),
	    N_
	    ("The actual focal length of the lens, in mm. Conversion is not "
		 "made to the focal length of a 35 mm film camera.")}
    ,
    {
    EXIF_TAG_MAKER_NOTE, "MakerNote", N_("Maker Note"),
	    N_
	    ("A tag for manufacturers of Exif writers to record any desired "
		 "information. The contents are up to the manufacturer.")}
    ,
    {
    EXIF_TAG_USER_COMMENT, "UserComment", N_("User Comment"),
	    N_
	    ("A tag for Exif users to write keywords or comments on the image "
		 "besides those in <ImageDescription>, and without the "
		 "character code limitations of the <ImageDescription> tag. The "
		 "character code used in the <UserComment> tag is identified "
		 "based on an ID code in a fixed 8-byte area at the start of "
		 "the tag data area. The unused portion of the area is padded "
		 "with NULL (\"00.h\"). ID codes are assigned by means of "
		 "registration. The designation method and references for each "
		 "character code are given in Table 6. The value of CountN "
		 "is determinated based on the 8 bytes in the character code "
		 "area and the number of bytes in the user comment part. Since "
		 "the TYPE is not ASCII, NULL termination is not necessary "
		 "(see Fig. 9). "
		 "The ID code for the <UserComment> area may be a Defined code "
		 "such as JIS or ASCII, or may be Undefined. The Undefined name "
		 "is UndefinedText, and the ID code is filled with 8 bytes of all "
		 "\"NULL\" (\"00.H\"). An Exif reader that reads the "
		 "<UserComment> tag must have a function for determining the "
		 "ID code. This function is not required in Exif readers that "
		 "do not use the <UserComment> tag (see Table 7). "
		 "When a <UserComment> area is set aside, it is recommended that "
		 "the ID code be ASCII and that the following user comment "
		 "part be filled with blank characters [20.H].")}
    ,
    {
    EXIF_TAG_SUBSEC_TIME, "SubsecTime", "SubsecTime",
	    N_("A tag used to record fractions of seconds for the "
		   "<DateTime> tag.")}
    ,
    {
    EXIF_TAG_SUB_SEC_TIME_ORIGINAL, "SubSecTimeOriginal",
	    "SubSecTimeOriginal",
	    N_("A tag used to record fractions of seconds for the "
		   "<DateTimeOriginal> tag.")}
    ,
    {
    EXIF_TAG_SUB_SEC_TIME_DIGITIZED, "SubSecTimeDigitized",
	    "SubSecTimeDigitized",
	    N_("A tag used to record fractions of seconds for the "
		   "<DateTimeDigitized> tag.")}
    ,
    {
    EXIF_TAG_FLASH_PIX_VERSION, "FlashPixVersion", "FlashPixVersion",
	    N_("The FlashPix format version supported by a FPXR file.")}
    ,
    {
    EXIF_TAG_COLOR_SPACE, "ColorSpace", N_("Color Space"),
	    N_("The color space information tag (<ColorSpace>) is always "
		   "recorede as the color space specifier. Normally sRGB (=1) "
		   "is used to define the color space based on the PC monitor "
		   "conditions and environment. If a color space other than "
		   "sRGB is used, Uncalibrated (=FFFF.H) is set. Image data "
		   "recorded as Uncalibrated can be treated as sRGB when it is "
		   "converted to FlashPix. On sRGB see Appendix E.")}
    ,
    {
    EXIF_TAG_PIXEL_X_DIMENSION, "PixelXDimension", "PixelXDimension",
	    N_("Information specific to compressed data. When a "
		   "compressed file is recorded, the valid width of the "
		   "meaningful image must be recorded in this tag, whether or "
		   "not there is padding data or a restart marker. This tag "
		   "should not exist in an uncompressed file. For details see "
		   "section 2.8.1 and Appendix F.")}
    ,
    {
    EXIF_TAG_PIXEL_Y_DIMENSION, "PixelYDimension", "PixelYDimension",
	    N_
	    ("Information specific to compressed data. When a compressed "
		 "file is recorded, the valid height of the meaningful image "
		 "must be recorded in this tag, whether or not there is padding "
		 "data or a restart marker. This tag should not exist in an "
		 "uncompressed file. For details see section 2.8.1 and Appendix "
		 "F. Since data padding is unnecessary in the vertical direction, "
		 "the number of lines recorded in this valid image height tag "
		 "will in fact be the same as that recorded in the SOF.")}
    ,
    {
    EXIF_TAG_RELATED_SOUND_FILE, "RelatedSoundFile",
	    "RelatedSoundFile",
	    N_
	    ("This tag is used to record the name of an audio file related "
		 "to the image data. The only relational information "
		 "recorded here is the Exif audio file name and extension (an "
		 "ASCII string consisting of 8 characters + '.' + 3 "
		 "characters). The path is not recorded. Stipulations on audio "
		 "are given in  section 3.6.3. File naming conventions are "
		 "given in section 3.7.1. "
		 "When using this tag, audio files must be recorded in "
		 "conformance to the Exif audio format. Writers are also allowed "
		 "to store the data such as Audio within APP2 as FlashPix "
		 "extension stream data. "
		 "Audio files must be recorded in conformance to the Exif audio "
		 "format. The mapping of Exif image files and audio files is done "
		 "in any of the three ways shown in Table 8. If multiple files "
		 "are mapped to one file as in [2] or [3] of this table, the above "
		 "format is used to record just one audio file name. If "
		 "there are multiple audio files, the first recorded file is "
		 "given. In the case of [3] in Table 8, for example, for the "
		 "Exif image file \"DSC00001.JPG\" only  \"SND00001.WAV\" is "
		 "given as the related Exif audio file. When there are three "
		 "Exif audio files \"SND00001.WAV\", \"SND00002.WAV\" and "
		 "\"SND00003.WAV\", the Exif image file name for each of them, "
		 "\"DSC00001.JPG\", is indicated. By combining multiple "
		 "relational information, a variety of playback possibilities "
		 "can be supported. The method of using relational information "
		 "is left to the implementation on the playback side. Since this "
		 "information is an ASCII character string, it is terminated by "
		 "NULL. When this tag is used to map audio files, the relation "
		 "of the audio file to image data must also be indicated on the "
		 "audio file end.")}
    ,
    {
    EXIF_TAG_INTEROPERABILITY_IFD_POINTER, "InteroperabilityIFDPointer",
	    "InteroperabilityIFDPointer",
	    N_
	    ("Interoperability IFD is composed of tags which stores the "
		 "information to ensure the Interoperability and pointed "
		 "by the following tag located in Exif IFD. "
		 "The Interoperability structure of Interoperability IFD is "
		 "the same as TIFF defined IFD structure "
		 "but does not contain the "
		 "image data characteristically compared with normal TIFF "
		 "IFD.")}
    ,
    {
    EXIF_TAG_FLASH_ENERGY, "FlashEnergy", N_("Flash Energy"),
	    N_("Indicates the strobe energy at the time the image is "
		   "captured, as measured in Beam Candle Power Seconds (BCPS).")}
    ,
    {
    EXIF_TAG_SPATIAL_FREQUENCY_RESPONSE, "SpatialFrequencyResponse",
	    N_("Spatial Frequency Response"),
	    N_
	    ("This tag records the camera or input device spatial frequency "
		 "table and SFR values in the direction of image width, "
		 "image height, and diagonal direction, as specified in ISO "
		 "12233.")}
    ,
    {
    EXIF_TAG_FOCAL_PLANE_X_RESOLUTION, "FocalPlaneXResolution",
	    N_("Focal Plane x-Resolution"),
	    N_
	    ("Indicates the number of pixels in the image width (X) direction "
		 "per <FocalPlaneResolutionUnit> on the camera focal plane.")}
    ,
    {
    EXIF_TAG_FOCAL_PLANE_Y_RESOLUTION, "FocalPlaneYResolution",
	    N_("Focal Plane y-Resolution"),
	    N_
	    ("Indicates the number of pixels in the image height (V) direction "
		 "per <FocalPlaneResolutionUnit> on the camera focal plane.")}
    ,
    {
    EXIF_TAG_FOCAL_PLANE_RESOLUTION_UNIT, "FocalPlaneResolutionUnit",
	    N_("Focal Plane Resolution Unit"),
	    N_
	    ("Indicates the unit for measuring <FocalPlaneXResolution> and "
		 "<FocalPlaneYResolution>. This value is the same as the "
		 "<ResolutionUnit>.")}
    ,
    {
    EXIF_TAG_SUBJECT_LOCATION, "SubjectLocation",
	    N_("Subject Location"),
	    N_
	    ("Indicates the location of the main subject in the scene. The "
		 "value of this tag represents the pixel at the center of the "
		 "main subject relative to the left edge, prior to rotation "
		 "processing as per the <Rotation> tag. The first value "
		 "indicates the X column number and second indicates "
		 "the Y row number.")}
    ,
    {
    EXIF_TAG_EXPOSURE_INDEX, "ExposureIndex", N_("Exposure index"),
	    N_("Indicates the exposure index selected on the camera or "
		   "input device at the time the image is captured.")}
    ,
    {
    EXIF_TAG_SENSING_METHOD, "SensingMethod", N_("Sensing Method"),
	    N_("Indicates the image sensor type on the camera or input "
		   "device.")}
    ,
    {
    EXIF_TAG_FILE_SOURCE, "FileSource", N_("File Source"),
	    N_("Indicates the image source. If a DSC recorded the image, "
		   "this tag value of this tag always be set to 3, indicating "
		   "that the image was recorded on a DSC.")}
    ,
    {
    EXIF_TAG_SCENE_TYPE, "SceneType", N_("Scene Type"),
	    N_
	    ("Indicates the type of scene. If a DSC recorded the image, "
		 "this tag value must always be set to 1, indicating that the "
		 "image was directly photographed.")}
    ,
    {
    EXIF_TAG_NEW_CFA_PATTERN, "CFAPattern",
	    N_("CFA Pattern"),
	    N_
	    ("Indicates the color filter array (CFA) geometric pattern of the "
		 "image sensor when a one-chip color area sensor is used. "
		 "It does not apply to all sensing methods.")}
    ,
    {
    EXIF_TAG_SUBJECT_AREA, "SubjectArea", N_("Subject Area"),
	    N_
	    ("This tag indicates the location and area of the main subject "
		 "in the overall scene.")}
    ,
    {
    EXIF_TAG_CUSTOM_RENDERED, "CustomRendered", N_("Custom Rendered"),
	    N_
	    ("This tag indicates the use of special processing on image "
		 "data, such as rendering geared to output. When special "
		 "processing is performed, the reader is expected to disable "
		 "or minimize any further processing.")}
    ,
    {
    EXIF_TAG_EXPOSURE_MODE, "ExposureMode", N_("Exposure Mode"),
	    N_
	    ("This tag indicates the exposure mode set when the image was "
		 "shot. In auto-bracketing mode, the camera shoots a series of "
		 "frames of the same scene at different exposure settings.")}
    ,
    {
    EXIF_TAG_WHITE_BALANCE, "WhiteBalance", N_("White Balance"),
	    N_
	    ("This tag indicates the white balance mode set when the image "
		 "was shot.")}
    ,
    {
    EXIF_TAG_DIGITAL_ZOOM_RATIO, "DigitalZoomRatio",
	    N_("Digital Zoom Ratio"),
	    N_
	    ("This tag indicates the digital zoom ratio when the image was "
		 "shot. If the numerator of the recorded value is 0, this "
		 "indicates that digital zoom was not used.")}
    ,
    {
    EXIF_TAG_FOCAL_LENGTH_IN_35MM_FILM, "FocalLengthIn35mmFilm",
	    N_("Focal Length In 35mm Film"),
	    N_
	    ("This tag indicates the equivalent focal length assuming a "
		 "35mm film camera, in mm. A value of 0 means the focal "
		 "length is unknown. Note that this tag differs from the "
		 "FocalLength tag.")}
    ,
    {
    EXIF_TAG_SCENE_CAPTURE_TYPE, "SceneCaptureType",
	    N_("Scene Capture Type"),
	    N_
	    ("This tag indicates the type of scene that was shot. It can "
		 "also be used to record the mode in which the image was "
		 "shot. Note that this differs from the scene type "
		 "(SceneType) tag.")}
    ,
    {
    EXIF_TAG_GAIN_CONTROL, "GainControl", N_("Gain Control"),
	    N_("This tag indicates the degree of overall image gain "
		   "adjustment.")}
    ,
    {
    EXIF_TAG_CONTRAST, "Contrast", N_("Contrast"),
	    N_("This tag indicates the direction of contrast processing "
		   "applied by the camera when the image was shot.")}
    ,
    {
    EXIF_TAG_SATURATION, "Saturation", N_("Saturation"),
	    N_
	    ("This tag indicates the direction of saturation processing "
		 "applied by the camera when the image was shot.")}
    ,
    {
    EXIF_TAG_SHARPNESS, "Sharpness", N_("Sharpness"),
	    N_("This tag indicates the direction of sharpness processing "
		   "applied by the camera when the image was shot.")}
    ,
    {
    EXIF_TAG_DEVICE_SETTING_DESCRIPTION, "DeviceSettingDescription",
	    N_("Device Setting Description"),
	    N_("This tag indicates information on the picture-taking "
		   "conditions of a particular camera model. The tag is used "
		   "only to indicate the picture-taking conditions in the "
		   "reader.")}
    ,
    {
    EXIF_TAG_SUBJECT_DISTANCE_RANGE, "SubjectDistanceRange",
	    N_("Subject Distance Range"),
	    N_("This tag indicates the distance to the subject.")}
    ,
    {
    EXIF_TAG_IMAGE_UNIQUE_ID, "ImageUniqueID", N_("Image Unique ID"),
	    N_("This tag indicates an identifier assigned uniquely to "
		   "each image. It is recorded as an ASCII string equivalent "
		   "to hexadecimal notation and 128-bit fixed length.")}
    ,
    {
    0, NULL, NULL, NULL}
};

const char *
exif_tag_get_name (ExifTag tag)
{
    unsigned int i;

    for (i = 0; ExifTagTable[i].name; i++)
	if (ExifTagTable[i].tag == tag)
	    break;

    return (ExifTagTable[i].name);
}

const char *
exif_tag_get_title (ExifTag tag)
{
    unsigned int i;

/*	bindtextdomain (GETTEXT_PACKAGE, LIBEXIF_LOCALEDIR); */

    for (i = 0; ExifTagTable[i].title; i++)
	if (ExifTagTable[i].tag == tag)
	    break;

    return (_(ExifTagTable[i].title));
}

const char *
exif_tag_get_description (ExifTag tag)
{
    unsigned int i;

/*	bindtextdomain (GETTEXT_PACKAGE, LIBEXIF_LOCALEDIR); */

    for (i = 0; ExifTagTable[i].description; i++)
	if (ExifTagTable[i].tag == tag)
	    break;

    return (_(ExifTagTable[i].description));
}
