Feature Representation

This will always be jpeg_raster.

This represents 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 photometric interpretation tag. However, since photometric interpretation 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. The value can be:

0 - does not exist

1 - Y

2 - Cb

3 - Cr

4 - R

5 - G

6 - B

Other - reserved

The default is 4 5 6 0 (if RGB uncompressed) or 1 2 3 0 (other cases). This is a reader attribute.

This indicates the direction of contrast processing applied by the camera when the image was shot. The value can be:

0 - Normal

1 - Soft

2 - Hard

This is a reader attribute.

This represents the date and time of image creation. In this standard it is the date and time the file was changed. The format is “YYYY:MM:DD HH:MM:SS” with time shown in 24-hour format, and the date and time separated by one blank character. When the date and time are unknown, all the character spaces except colons (“:”) may be filled with blank characters, or else the interoperability field may be filled with blank characters. The character's string length is 20 bytes including a null character for termination. When the field is left blank, it is treated as unknown. This is a reader attribute.

This represents the date and time when the original image data was generated. For a DSC the date and time the picture was taken are recorded. The format “YYYY:MM:DD HH:MM:SS” with time shown in 24-hour format, and the date and time separated by one blank character. When the date and time are unknown, all the character spaces except colons (“:”) may be filled with blank characters. The character string length is 20 bytes including a null character for termination. When the field is left blank, it is treated as unknown.

This is a reader attribute.

This represents the version of this standard supported. Non-existence of this field is taken to mean non-conformance to the standard. Conformance to this standard is indicated by recording “0220” as 4-byte ASCII. Since the type is UNDEFINED, there is no null character for termination. This is a reader attribute.

This represents 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. The value can be:

0 - auto exposure

1 - manual exposure

2 - auto bracket

Other reserved

This is a reader attribute.

This represents the exposure time of the image. This is a reader attribute.

This represents the status of flash when the images was shot. Bit 0 indicates the flash firing status, bits 1 and 2 indicate the flash return status, bits 3 and 4 indicate the flash mode, bit 5 indicates whether the flash function is present, and bit 6 indicates “red eye” mode. The value can be:

Bit 0: 0 - flash did not fire

Bit 0: 1 - flash fired

Bit 1 and 2: 00 - no strobe return detection function

Bit 1 and 2: 01 - reserved

Bit 1 and 2: 10 - strobe return light not detected

Bit 1 and 2: 11 - strobe return light detected

Bit 3 and 4: 00 - unknown

Bit 3 and 4: 01 - compulsory flash firing

Bit 3 and 4: 10 - compulsory flash suppression

Bit 3 and 4: 11 - auto mode

Bit 5: 0 - flash function present

Bit 5: 1 - no flash function

Bit 6: 0 - no red-eye reduction mode or unknown

Bit 6: 1 - red-eye reduction supported

This is a reader attribute.

This represents the f number of the recording equipment. This is a reader attribute.

This indicates the equivalent focal length assuming a 35mm film camera, in mm. A value of 0 means the focal length is unknown.

This is a reader attribute.

This represents the number of pixels in the image width (x) direction per jpeg_exif_focalplaneresolutionunit on the camera focal plane.

This is a reader attribute.

The degree of overall image gain adjustment.

This is a reader attribute.

This indicates the altitude used as the reference altitude. The value can be:

0 - above sea level

1 - below sea level

This is a reader attribute.

This represents the date relative to UTC (Coordinated Universal Time). The format is “YYYY:MM:DD”.

This is a reader attribute.

This represents the reference used for giving the bearing to the destination point. The value can be:

T - true direction

M - magnetic direction

This is a reader attribute.

This represents the unit used to express the distance to the destination point. The value can be:

K - kilometers per hour

M - miles per hour

N - knots

This is a reader attribute.

This indicates whether the latitude of the destination point is north or south. The value can be:

N - north latitude

S - south latitude

This is a reader attribute.

This indicates whether the longitude of the destination point is east or west. The value can be:

E - east longitude

W - west longitude

This is a reader attribute.

This represents the GPS DOP (data degree of precision). An HDOP value is written during two-dimensional measurement, and PDOP during three-dimensional measurement. This is a reader attribute.

This represents the reference for giving the direction of the image when it is captured. The value can be:

T - true direction

M - magnetic direction

This is a reader attribute.

This indicates whether the latitude is north or south. The value can be:

N - north latitude

S - south latitude

This is a reader attribute.

This indicates whether the longitude is east or west. The value can be:

E - east longitude

W - west longitude

This is a reader attribute.

This represents the GPS measurement mode. The value can be:

2 - 2-dimensional measurement

3 - 3-dimensional measurement

This is a reader attribute.

This represents the satellites used for measurements. This tag can be used to describe the number of satellites, their ID number, angle of elevation, azimuth, SNR and other information in ASCII notation. The format is not specified.

This is a reader attribute.

This represents the unit used to express the GPS receiver speed of movement. The value can be:

K - kilometers per hour

M - miles per hour

N - knots

This is a reader attribute.

This represents the time as UTC (Coordinated Universal Time). It is expressed as three numbers giving the hour, minute, and second.

This is a reader attribute.

This represents the reference for giving the direction of GPS receiver movement. The value can be:

T - true direction

M - magnetic direction

This is a reader attribute.

The kind of light source.

0 - Unknown

1 - Daylight

2 - Fluorescent

3 - Tungsten (incandescent light)

4 - Flash

9 - Fine weather

10 - Cloudy weather

11 - Shade

12 - Daylight fluorescent (D 5700 – 7100K)

13 - Day white fluorescent (N 4600 – 5400K)

14 - Cool white fluorescent (W 3900 – 4500K)

15 - White fluorescent (WW 3200 – 3700K)

17 - Standard light A

18 - Standard light B

19 - Standard light C

20 - D55

21 - D65

22 - D75

23 - D50

24 - ISO studio tungsten

255 - other light source

This is a reader attribute.

This represents a tag for manufacturers of Exif writers to record any desired information. The contents are up to the manufacturer, but this tag should not be used for any other than its intended purpose.

This is a reader attribute.

This represents the metering mode. The value can be:

0 - unknown

1 - average

2 - center weighted average

3 - spot

4 - multispot

5 - pattern

6 - partial

Other - reserved

255 - other

The default value is 0.

This is a reader attribute.

This represents the image orientation viewed in terms of rows and columns.

This is a reader attribute.

The value can be:

1 - which means that the 0th row is at the visual top of the image, and the 0th column is the visual left-hand side;

2 - which means that the 0th row is at the visual top of the image, and the 0th column is the visual right-hand side;

3 - which means that the 0th row is at the visual bottom of the image, and the 0th column is the visual right-hand side;

4 - which means that the 0th row is at the visual bottom of the image, and the 0th column is the visual left-hand side;

5 - which means that the 0th row is the visual left-hand side of the image, and the 0th column is the visual top;

6 - which means that the 0th row is the visual right-hand side of the image, and the 0th column is the visual top;

7 - which means that the 0th row is the visual right-hand side of the image, and the 0th column is the visual bottom;

8 - which means that the 0th row is the visual left-hand side of the image, and the 0th column is the visual bottom.

This represents information specific to compressed data. When a compressed file is recorded, the valid height of the meaningful image shall be recorded in this attribute, whether or not there is padding data or restart marker. This attribute should not exist in an uncompressed file.

This is reader attribute.

This represents the unit of x and y resolution.

This is a reader attribute.

This represents 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 attribute. The value can be:

0 - standard

1 - landscape

2 - portrait

3 - night scene

Other reserved

The default value is 0. This is a reader attribute.

This indicates the direction of sharpness processing applied by the camera when the image was shot.

0 - Normal

1 - Soft

2 - Hard

This is a reader attribute.

This records the name and version of the software or firmware of the camera or image input device used to generate the image. This is a reader attribute.

Used to record fractions of seconds for the DateTime tag.

This is a reader attribute.

Used to record fractions of seconds for the DateTimeOriginal tag.

This is a reader attribute.

This represents the white balance mode set when the image was shot. The value can be:

0 - auto white balance

1 - manual white balance

Other - reserved

This is a reader attribute.

Author tag used by Windows.

Subject tag used by Windows.

Title tag used by Windows.

The matrix coefficients for transformation from RGB to YCbCr image data.

This is a reader attribute.

This represents the number of pixel per jpeg_exif_resolutionunit in the jpeg_exif_imagelength direction. The same value as jpeg_exif_xresolution is designated.

This is a reader attribute.

Enables or disables the generation of a TAB file along with the output JPEG image. The value can be yes or no. The default value is yes.

This is a writer attribute.