File Information (EXIF) – What your photos can say…

Do you post pictures online? E-mail them to friends? When you do you might be sending more information than you think.
 
Take a look at the information below, this is all from a single picture I took with my phone. This information is embedded in the image as metadata and is used by various applications and tools.
 
Take a look over the information and I’ll explain more below.
 

File Size                       : 2.1 MB
File Type                       : JPEG
MIME Type                       : image/jpeg
Exif Byte Order                 : Big-endian (Motorola, MM)
Make                            : Apple
Camera Model Name               : iPhone 5
Orientation                     : Rotate 90 CW
X Resolution                    : 72
Y Resolution                    : 72
Resolution Unit                 : inches
Software                        : 7.1.1
Modify Date                     : 2014:05:03 11:32:20
Y Cb Cr Positioning             : Centered
Exposure Time                   : 1/847
F Number                        : 2.4
Exposure Program                : Program AE
ISO                             : 50
Exif Version                    : 0221
Date/Time Original              : 2014:05:03 11:32:20
Create Date                     : 2014:05:03 11:32:20
Components Configuration        : Y, Cb, Cr, -
Shutter Speed Value             : 1/847
Aperture Value                  : 2.4
Brightness Value                : 9.095280499
Metering Mode                   : Multi-segment
Flash                           : Off, Did not fire
Focal Length                    : 4.1 mm
Subject Area                    : 1357 1275 456 457
Run Time Scale                  : 1000000000
Run Time Epoch                  : 0
Run Time Value                  : 65539364512708
Run Time Flags                  : Valid
Sub Sec Time Original           : 334
Sub Sec Time Digitized          : 334
Flashpix Version                : 0100
Color Space                     : sRGB
Exif Image Width                : 3264
Exif Image Height               : 2448
Sensing Method                  : One-chip color area
Scene Type                      : Directly photographed
Exposure Mode                   : Auto
White Balance                   : Auto
Focal Length In 35mm Format     : 33 mm
Scene Capture Type              : Standard
Lens Info                       : 4.12mm f/2.4
Lens Make                       : Apple
Lens Model                      : iPhone 5 back camera 4.12mm f/2.4
GPS Latitude Ref                : North
GPS Longitude Ref               : West
GPS Altitude Ref                : Above Sea Level
GPS Time Stamp                  : 18:32:11.58
GPS Img Direction Ref           : True North
GPS Img Direction               : 356.9633028
Compression                     : JPEG (old-style)
Thumbnail Offset                : 1254
Thumbnail Length                : 9119
Image Width                     : 3264
Image Height                    : 2448
Encoding Process                : Baseline DCT, Huffman coding
Bits Per Sample                 : 8
Color Components                : 3
Y Cb Cr Sub Sampling            : YCbCr4:2:0 (2 2)
Aperture                        : 2.4
GPS Altitude                    : 60.3 m Above Sea Level
GPS Latitude                    : 37 deg 55' 52.24" N
GPS Longitude                   : 122 deg 1' 51.43" W
GPS Position                    : 37 deg 55' 52.24" N, 122 deg 1' 51.43" W
Image Size                      : 3264x2448
Run Time Since Power Up         : 18:12:19
Scale Factor To 35 mm Equivalent: 8.0
Shutter Speed                   : 1/847
Create Date                     : 2014:05:03 11:32:20.334
Date/Time Original              : 2014:05:03 11:32:20.334
Circle Of Confusion             : 0.004 mm
Field Of View                   : 57.2 deg
Focal Length                    : 4.1 mm (35 mm equivalent: 33.0 mm)
Hyperfocal Distance             : 1.89 m
Light Value                     : 13.3

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