AWARE SYSTEMS
Programmer for hire
Imaging / TIFF / TIFF Tag Reference / Private IFD Tags / EXIF Tags

TIFF Tag Reference, Exif Tags

Exif tags are used largely to encode additional information related to image generation by digital still cameras. Exif is the abbreviation of 'Exchangeable image file format', though this can be argued to be a misnomer, as Exif does not relate to TIFF like e.g. JFIF relates to JPEG.

The Exif IFD is pointed to by the Exif IFD tag.

There are actually three private IFDs specified by the Exif standard. The other two are the GPS IFD and the Interoperability IFD. For the Exif specification and other related information, see Exif.org.

CodeNameShort description
DecHex
33434829AExposureTimeExposure time, given in seconds.
33437829DFNumberThe F number.
34850 8822 ExposureProgram The class of the program used by the camera to set exposure when the picture is taken.
34852 8824 SpectralSensitivity Indicates the spectral sensitivity of each channel of the camera used.
34855 8827 ISOSpeedRatings Indicates the ISO Speed and ISO Latitude of the camera or input device as specified in ISO 12232.
348568828OECFIndicates the Opto-Electric Conversion Function (OECF) specified in ISO 14524.
368649000ExifVersionThe version of the supported Exif standard.
368679003DateTimeOriginalThe date and time when the original image data was generated.
368689004DateTimeDigitizedThe date and time when the image was stored as digital data.
37121 9101 ComponentsConfiguration Specific to compressed data; specifies the channels and complements PhotometricInterpretation
37122 9102 CompressedBitsPerPixel Specific to compressed data; states the compressed bits per pixel.
373779201ShutterSpeedValueShutter speed.
373789202ApertureValueThe lens aperture.
373799203BrightnessValueThe value of brightness.
373809204ExposureBiasValueThe exposure bias.
373819205MaxApertureValueThe smallest F number of the lens.
373829206SubjectDistanceThe distance to the subject, given in meters.
373839207MeteringModeThe metering mode.
373849208LightSourceThe kind of light source.
373859209FlashIndicates the status of flash when the image was shot.
37386920AFocalLengthThe actual focal length of the lens, in mm.
373969214SubjectAreaIndicates the location and area of the main subject in the overall scene.
37500927CMakerNoteManufacturer specific information.
375109286UserCommentKeywords or comments on the image; complements ImageDescription.
375209290SubsecTimeA tag used to record fractions of seconds for the DateTime tag.
37521 9291 SubsecTimeOriginal A tag used to record fractions of seconds for the DateTimeOriginal tag.
37522 9292 SubsecTimeDigitized A tag used to record fractions of seconds for the DateTimeDigitized tag.
40960A000FlashpixVersionThe Flashpix format version supported by a FPXR file.
40961A001ColorSpaceThe color space information tag is always recorded as the color space specifier.
40962A002PixelXDimensionSpecific to compressed data; the valid width of the meaningful image.
40963A003PixelYDimensionSpecific to compressed data; the valid height of the meaningful image.
40964A004RelatedSoundFileUsed to record the name of an audio file related to the image data.
41483 A20B FlashEnergy Indicates the strobe energy at the time the image is captured, as measured in Beam Candle Power Seconds
41484 A20C SpatialFrequencyResponse 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.
41486 A20E FocalPlaneXResolution Indicates the number of pixels in the image width (X) direction per FocalPlaneResolutionUnit on the camera focal plane.
41487 A20F FocalPlaneYResolution Indicates the number of pixels in the image height (Y) direction per FocalPlaneResolutionUnit on the camera focal plane.
41488 A210 FocalPlaneResolutionUnit Indicates the unit for measuring FocalPlaneXResolution and FocalPlaneYResolution.
41492A214SubjectLocationIndicates the location of the main subject in the scene.
41493 A215 ExposureIndex Indicates the exposure index selected on the camera or input device at the time the image is captured.
41495A217SensingMethodIndicates the image sensor type on the camera or input device.
41728A300FileSourceIndicates the image source.
41729A301SceneTypeIndicates the type of scene.
41730 A302 CFAPattern Indicates the color filter array (CFA) geometric pattern of the image sensor when a one-chip color area sensor is used.
41985 A401 CustomRendered Indicates the use of special processing on image data, such as rendering geared to output.
41986A402ExposureModeIndicates the exposure mode set when the image was shot.
41987A403WhiteBalanceIndicates the white balance mode set when the image was shot.
41988A404DigitalZoomRatioIndicates the digital zoom ratio when the image was shot.
41989 A405 FocalLengthIn35mmFilm Indicates the equivalent focal length assuming a 35mm film camera, in mm.
41990A406SceneCaptureTypeIndicates the type of scene that was shot.
41991A407GainControlIndicates the degree of overall image gain adjustment.
41992 A408 Contrast Indicates the direction of contrast processing applied by the camera when the image was shot.
41993 A409 Saturation Indicates the direction of saturation processing applied by the camera when the image was shot.
41994 A40A Sharpness Indicates the direction of sharpness processing applied by the camera when the image was shot.
41995 A40B DeviceSettingDescription This tag indicates information on the picture-taking conditions of a particular camera model.
41996A40CSubjectDistanceRangeIndicates the distance to the subject.
42016A420ImageUniqueIDIndicates an identifier assigned uniquely to each image.