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EXIF Data - Metadata details
On the exif-summary page, you were provided with a high level view of what is available directly from your camera and what is available in most imaging programs. All Exif files (TIFF and JPG) can contain the following TIFF comments.
| ARTIST | Person who created the image. |
| COPYRIGHT | Copyright notice. |
| DATETIME | Date and time (YYYY:MM:DD HH:MM:SS). The field length is 20, counting the NULL terminator. |
| DESC | Description of the image. |
| HOSTCOMP | Computer and operating system in use. |
| MAKE | Manufacturer of the equipment used to create the image. |
| MODEL | Model name and number of the equipment. |
| NAMEOFDOC | Name of the document from which the image was scanned. |
| NAMEOFPAGE | Page name from which the image was scanned. |
| SOFTWARE | Name and version of software package used to create the image. |
General Exif comments: Exif files can contain the following general comments.
| EXIFVERSION | Exif version. |
| SUBSECTIME | Decimal extension for seconds that are specified in the SZDATETIME field. |
| DATETIMEORIGINAL | Date and time the original image is captured. The format is YYYY:MM:DD HH:MM:SS. The time is in a 24-hour format, and a blank space is left between the date and the time. |
| SUBSECTIMEORIGINAL | Decimal extension for seconds that are specified in the SZDATETIMEORIGINAL field. |
| DATETIMEDIGITIZED | Date and time the file is generated. If the file is generated directly, as with a digital camera, this is the same as the time the original image is captured. |
| SUBSECTIMEDIGITIZED | Decimal extension for seconds that are specified in the SZDATETIMEDIGITIZED field. |
| SHUTTERSPEEDVALUE | Shutter speed. The unit of measure is APEX. |
| APERTURE | Aperture value. This is the ratio of lens aperture for the focal length. |
| BRIGHTNESS | Brightness value. |
| EXPOSUREBIAS | Exposure bias. This is the value for correcting a biased exposure. |
| MAXAPERTURE | Minimum lens f-number. |
| SUBJECTDISTANCE | Distance from lens to subject (in meters). |
| METERINGMODE | Photometry mode. Possible values are
0 = Unidentified
1 = Average
2 = Center Weighted Average
3 = Spot
4 = MultiSpot
5 = Pattern
6 = Partial
255 = Others |
| LIGHTSOURCE | Light source. Possible values are
0 = Unidentified
1 = Daylight
2 = Florescence light
3 = Tungsten Lamp
17 = Standard light source A
18 = Standard light source B
19 = Standard light source C
20 = D55
21 = D65
22 = D75
255 = Others |
| FLASH | Flash On/Off. |
| FOCALLENGTH | Focal length, measured in millimeters. |
| EXPOSURETIME | Exposure time, expressed as a fraction of a second. |
| FNUMBER | The actual lens F stop (ratio of lens aperture to focal length). |
| MAKERNOTE | Maker note. The creator of the file determines the data format. |
| USERCOMMENT | User comment. |
| SUPPORTEDFLASHPIXVERSION | Supported FlashPix version (Exif 2.0). |
| COLORSPACE | Color space (Exif 2.0). Specifies whether the color is calibrated or not. |
| EXPOSUREPROGRAM | Exposure program (Exif 2.0) The class of the program used by the camera to set exposure when the picture is taken. Possible values are:
0 = Not defined
1 = Manual
2 = Aperture priority
4 = Shutter priority
5 = Creative program (biased toward depth of field)
6 = Action program (biased toward fast shutter speed)
7 = Portrait mode (for closeup photos with the background out of focus)
Other = reserved |
| SPECTRALSENSITIVITY | Spectral sensitivity (Exif) - The spectral sensitivity of each channel of the camera used. |
| ISOSPEEDRATINGS | ISO speed ratings (Exif) - the ISO speed and the ISO Latitude of the camera or input device as specified in ISO 12232 |
| OPTOELECTRICCOEFFICIENT | Optoelectric coefficient (Exif) - Opto-Electric Conversion function specified in ISO 14524. OECF is the relationship between the camera optical input and the image values. |
| RELATEDSOUNDFILE | Related audio file (Exif) - the name of an audio file related to the image data. The name should be 8 ASCII chars + '.' + 3 chars for extension + NULL. |
| FLASHENERGY | Flash energy (Exif) - the strobe energy at the time the image iscaptured, as measured in Beam Candle Power Seconds (BPCS) |
| SPATIALFREQUENCYRESPONSE | Spatial frequency response (Exif) - 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. |
| FOCALPLANEXRESOLUTION | Focal plane X Resolution (Exif) - the number of dots per inch on the camera focal plane in the image width (X) direction |
| FOCALPLANEYRESOLUTION | Focal plane Y Resolution (Exif) - the number of dots per inch on the camera focal plane in the image height (Y) direction |
| SUBJECTLOCATION | Subject location (Exif) - the location of the main subject in the scene. |
| EXPOSUREINDEX | Exposure index (Exif) - the image sensor type on the camera or input device. |
| SENSINGMETHOD | Sensing method (Exif) - the image sensor type on the camera or input device. Possible values are:
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 sensor
other = reserved |
| FILESOURCE | File source (Exif) - the image source. If a digital camera recorded the image, the value will always be 3, to indicate that the image was recorded on a digital camera. Possible values are:
3 = image recorded on a DSC (Digital Still Camera)
other = reserved |
| SCENETYPE | Scene type (Exif) - the type of scene. If a DSC recorded the image, this value will always be 1, indicating that the image was directly photographed. Possible values are:
1 = a directly photographed image
other = reserved |
| CFAPATTERN | CFA Pattern (Exif) - the color filter array (CFA) geometric pattern of the image sensor when a one-chip color sensor was applied. It does not apply to any other sensing methods. |
Exif GPS comments. I've actually never seen these pieces of metadata in action, but they are available according to the Exif specification. Exif files can contain the following GPS (Global Positioning System) comments:
| GPSVERSIONID | Version number of the GPS image file directory (IFD). The current version is 2.0.0.0. This comment must be included when any GPS comments are used. Unlike the CMNT_EXIFVERSION comment, this comment is written in bytes. A version written as 2.0.0.0 is actually 0x02000000 when coded. |
| GPSLATITUDEREF | North or south latitude. Possible values are "N" for north and "S" for south. |
| GPSLATITUDE | Latitude, expressed as three RATIONAL values. When expressed in degrees, minutes, and seconds, latitude is written as dd/1,mm/1,ss/1. If degrees and minutes are used as the units, and minutes are written with fractions to two decimal places, then latitude is expressed as dd/1,mmmm/100,0/1. |
| GPSLONGITUDEREF | East or west longitude. Possible values are "E" for east and "W" for west. |
| GPSLONGITUDE | The longitude, expressed as three RATIONAL values. When expressed in degrees, minutes and seconds, longitude is written as ddd/1,mm/1,ss/1. If degrees and minutes are used as the units, and minutes are written with fractions to two decimal places, then longitude is expressed as dd/1,mmmm/100,0/1. |
| GPSALTITUDEREF | Reference altitude. In the current version, sea level is used as the reference, which must be zero. The reference unit is meters. |
| GPSALTITUDE | Altitude, in meters, relative to the reference altitude. |
| GPSTIMESTAMP | Time stamp in UTC (Coordinated Universal Time) time. The time is expressed as three RATIONAL values, for hours, minutes, and seconds. |
| GPSSATELLITES | GPS satellites used for measurement. The coding format is not stipulated. This comment can be used to code information such as the number of satellites, the satellite number, the satellite's angle of elevation, its azimuth, and its SNR. If the GPS receiver cannot make a measurement, this comment is NULL. |
| GPSSTATUS | Status of the GPS receiver at when the image is recorded. Possible values are "A" when measurement in progress and "V" when measurement is interrupted. |
| GPSMEASUREMODE | GPS measurement mode. A value of "2" denotes two-dimensional measurement, and "3" denotes three-dimensional measurement. |
| GPSDOP | DOP (data precision) value. This comment is an HDOP value during two-dimensional measurement and a PDOP value during three-dimensional measurement. |
| GPSSPEEDREF | Unit for measuring speed. Possible values are "K" for kilometers, "M" for miles, and "N" for knots. |
| GPSSPEED | Speed of the GPS receiver. |
| GPSTRACKREF | Reference for direction of movement. Possible values are "T" for a true direction and "M" for a magnetic. |
| GPSTRACK | Direction of GPS receiver movement. The range of values is 0.00 to 359.00. |
| GPSIMGDIRECTIONREF | Reference for the direction of photography in the recorded image. Possible values are "T" for a true direction and "M" for a magnetic. |
| GPSIMGDIRECTION | Direction of photography in the recorded image. The range of values is 0.00 to 359.00. |
| GPSMAPDATUM | Geodetic survey data used by the receiver. If the geodetic survey data is restricted to Japan, this tag value is "TOKYO" or "WGS-84". |
| GPSDESTLATITUDEREF | North or south latitude for the destination point. Possible values are "N" for north and "S" for south. |
| GPSDESTLATITUDE | Latitude of the destination point. The latitude is expressed as three RATIONAL values, indicating degrees, minutes and seconds. |
| GPSDESTLONGITUDERE | East or west longitude for the destination point. Possible values are "E" for east and "W" for west. |
| GPSDESTLONGITUDE | Longitude of the destination point. The longitude is expressed as three RATIONAL values, indicating degrees, minutes and seconds. |
| GPSDESTBEARINGREF | Reference for the bearing to the destination point. Possible values are "T" for a true direction and "M" for a magnetic. |
| GPSDESTBEARING | Bearing to the destination point. The range of values is 0.00 to 359.00. |
| GPSDESTDISTANCEREF | Unit for measuring distance to the destination point. Possible values are "K" for kilometers, "M" for miles, and "N" for nautical miles. |
| GPSDESTDISTANCE | Distance to the destination point. |
For much more information about the information available, click here.
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