Feb 05 2008
Exif
Exchangeable image file format (Exif) is a specification for the image file format used by digital cameras. The specification uses the existing JPEG, TIFF Rev. 6.0, and RIFF WAV file formats, with the addition of specific metadata tags.
Exif is a format for storing metadata in image files. Most digital cameras store metadata within pictures (jpgs). Some imaging software support a subset of the Exif tags and provide additional tags eg. Software.
Example metadata stored is as follows (not all cameras and software will support all of the tags):-
| Exif token | Example value for the image | |
| APERTURE | - | f/6.3 |
| ARTIST | - | Ian Williams |
| CAM | - | Canos EOS 5D |
| COLOR_SPACE | - | Uncalibrated |
| COMPRESSION | - | Uncompressed |
| CONTRAST | - | Normal |
| COPYRIGHT | - | © Ian Williams (Photographer) |
| DATETIME | - | 2007.01.01 16:26:50.57+01:00 |
| DATE_TIME_DIGITIZED | - | n.a. |
| DATE_TIME_ORIGINAL | - | n.a. |
| DIGITAL_ZOOM_RATIO | - | Auto white balance |
| EXPOSURE_BIAS_VALUE | - | 0.0 |
| EXPOSURE_MODE | - | Auto exposure |
| EXPOSURE_PROGRAM | - | Normal program |
| FLASH | - | Flash did not fire. |
| FNUMBER | - | f/6.3 |
| FOCAL | - | 26 mm |
| FOCAL_LENGTH_IN_35MM_FILM | - | 39 |
| GAIN_CONTROL | - | Normal |
| IMAGENUMBER | - | 7505 |
| ISO | - | 100 |
| LENS | - | 17.0-55.0 mm f/2.8 |
| LIGHT_SOURCE | - | Unknown |
| MAKE | - | CANON CORPORATION |
| MAX_APERTURE_VALUE | - | 30/10 |
| METERING_MODE | - | Pattern |
| MODEL | - | CANON EOS 5D |
| ORIENTATION | - | top - left |
| PHOTOMETRIC_INTERPRETATION | - | RGB |
| PIXEL_X_DIMENSION | - | 500 |
| PIXEL_Y_DIMENSION | - | 281 |
| RESOLUTION_UNIT | - | Inch |
| SATURATION | - | High saturation |
| SCENE_CAPTURE_TYPE | - | Standard |
| SCENE_TYPE | - | Directly photographed |
| SENSING_METHOD | - | One-chip color area sensor |
| SHARPNESS | - | Hard |
| SHUTTER | - | 1/160 s |
| SHUTTER_SPEED_VALUE | - | 7.321928 sec. (APEX: 12) |
| SOFTWARE | - | Adobe Photoshop CS3 Macintosh |
| SUBJECT_DISTANCE_RANGE | - | Unknown |
| WHITE_BALANCE | - | Auto white balance |
| X_RESOLUTION | - | 300 |
| Y_RESOLUTION | - | 300 |