EXIF

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EXIF is an acronym which stands for Exchangeable Image File. Digital cameras not only record the image seen through its lens but also information pertaining to the camera that took the image, and its settings. Various operating systems and photo editing software will show some or all the EXIF information. Typically, the date and time when the image was recorded and the various camera settings. This information is always available to the original file, making the Date Stamp feature nearly useless. VW strips this information when publishing a contri, or the user might when selecting the Save for the web... option is used inside a photo editing application, such as Photoshop.

Some examples of EXIF presentations available follow:

as show in EXIF Viewer:

EXIF IFD0
Camera Make {0x010F} Canon
Camera Model {0x0110} Canon PowerShot G6
Picture Orientation {0x0112} normal (1)
Last Modified Date/Time {0x0132} 2007:08:05 20:30:37
EXIF Sub IFD
Exposure Time (1 / Shutter Speed) {0x829A} 1/125 second ===> 0.008 second
Lens F-Number / F-Stop {0x829D} 40/10 ===> ƒ/4
Original Date/Time {0x9003} 2007:08:05 17:47:17
Shutter Speed Value (APEX) {0x9201} 223/32
Shutter Speed (Exposure Time) 1/125.26 second
Aperture Value (APEX) {0x9202} 128/32
Aperture ƒ/4
Flash {0x9209} Flash did not fire, auto mode
Focal Length {0x920A} 358/32 mm ===> 11.19 mm
Image Width {0xA002} 3072 pixels
Image Height {0xA003} 2304 pixels


The EXIF data as presented in GraphicConverter:

-- IFD0 --
Make: Canon 
Model: Canon PowerShot G6
Orientation of image: 1
X resolution: 180.0 ppi (pixel per inch)
Y resolution: 180.0 ppi (pixel per inch)
Resolution unit: inch
Software: QuickTime 7.2
File date and time: 2007:08:05 20:30:37
Host Computer: Mac OS X 10.3.9
Y and C positioning: centered
-- Exif IFD --
Exposure time: 1/125 s
F number: 4.0
Exif version: 0220
Date and time of original data generation: 2007:08:05 17:47:17
Unknown tag (36868): 2007:08:05 17:47:17
Meaning of each component: reserved
Image compression mode: 3.0
Shutter speed: 7.0 APEX = 1/125 s
Aperture: 4.0 APEX = F4.0
Exposure bias: 0.0
Maximum lens aperture: 2.3 APEX = F2.2
Metering mode: Pattern
Flash: Flash did not fire, auto mode.
Lens focal length: 11.2 mm
Manufacturer notes: 916 bytes
User comments: 264 bytes
Supported Flashpix version: 0100
Color Space: Uncalibrated
Valid image width in pixel: 3072
Valid image height in pixel: 2304
Focal plane x resolution: 10816.9 (768000/71) ppi (pixel per inch)
Focal plane y resolution: 10816.9 (2304000/213) ppi (pixel per inch)
Focal plane resolution unit: inch
Sensing method: One-chip color area sensor
File source: DSC
Custom image processing: Normal process
Exposure method: Auto exposure
White balance: Auto white balance
Digital zoom ratio: 1.0
Scene capture type: Night scene
-- Thumbnail IFD --
Compression scheme: JPEG
X resolution: 180.0 ppi (pixel per inch)
Y resolution: 180.0 ppi (pixel per inch)
Resolution unit: inch
Offset to JPEG SOI: 2030
Bytes of JPEG data: 4751
Y and C positioning: centered

XML data of the EXIF as presented in Photoshop: 

<?xpacket begin="" id="W5M0MpCehiHzreSzNTczkc9d"?>
<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Adobe XMP Core 5.0-c060 61.134777, 2010/02/12-17:32:00        ">
  <rdf:RDF xmlns:rdf="http;//www.w3.org/1999/02/22-rdf-syntax-ns#">
     <rdf:Description rdf:about=""
           xmlns:xmp="http;//ns.adobe.com/xap/1.0/">
        <xmp:ModifyDate>2007-08-05T20:30:37-05:00</xmp:ModifyDate>
        <xmp:CreateDate>2007-08-05T17:47:17-05:00</xmp:CreateDate>
        <xmp:CreatorTool>QuickTime 7.2</xmp:CreatorTool>
        <xmp:MetadataDate>2007-08-05T20:30:37-05:00</xmp:MetadataDate>
     </rdf:Description>
     <rdf:Description rdf:about=""
           xmlns:crs="http;//ns.adobe.com/camera-raw-settings/1.0/">
        <crs:AlreadyApplied>True</crs:AlreadyApplied>
     </rdf:Description>
     <rdf:Description rdf:about=""
           xmlns:photoshop="http;//ns.adobe.com/photoshop/1.0/">
        <photoshop:ColorMode>3</photoshop:ColorMode>
        <photoshop:ICCProfile>Camera RGB Profile</photoshop:ICCProfile>
        <photoshop:DateCreated>2007-08-05T17:47:17</photoshop:DateCreated>
     </rdf:Description>
     <rdf:Description rdf:about=""
           xmlns:tiff="http;//ns.adobe.com/tiff/1.0/">
        <tiff:ImageWidth>3072</tiff:ImageWidth>
        <tiff:ImageLength>2304</tiff:ImageLength>
        <tiff:BitsPerSample>
           <rdf:Seq>
              <rdf:li>8</rdf:li>
              <rdf:li>8</rdf:li>
              <rdf:li>8</rdf:li>
           </rdf:Seq>
        </tiff:BitsPerSample>
        <tiff:PhotometricInterpretation>2</tiff:PhotometricInterpretation>
        <tiff:Orientation>1</tiff:Orientation>
        <tiff:SamplesPerPixel>3</tiff:SamplesPerPixel>
        <tiff:YCbCrPositioning>1</tiff:YCbCrPositioning>
        <tiff:XResolution>11796480/65536</tiff:XResolution>
        <tiff:YResolution>11796480/65536</tiff:YResolution>
        <tiff:ResolutionUnit>2</tiff:ResolutionUnit>
        <tiff:Make>Canon</tiff:Make>
        <tiff:Model>Canon PowerShot G6</tiff:Model>
     </rdf:Description>
     <rdf:Description rdf:about=""
           xmlns:exif="http;//ns.adobe.com/exif/1.0/">
        <exif:ExifVersion>0220</exif:ExifVersion>
        <exif:FlashpixVersion>0100</exif:FlashpixVersion>
        <exif:ColorSpace>65535</exif:ColorSpace>
        <exif:ComponentsConfiguration>
           <rdf:Seq>
              <rdf:li>1</rdf:li>
              <rdf:li>2</rdf:li>
              <rdf:li>3</rdf:li>
              <rdf:li>0</rdf:li>
           </rdf:Seq>
        </exif:ComponentsConfiguration>
        <exif:CompressedBitsPerPixel>3/1</exif:CompressedBitsPerPixel>
        <exif:PixelXDimension>3072</exif:PixelXDimension>
        <exif:PixelYDimension>2304</exif:PixelYDimension>
        <exif:DateTimeOriginal>2007-08-05T17:47:17</exif:DateTimeOriginal>
        <exif:DateTimeDigitized>2007-08-05T17:47:17</exif:DateTimeDigitized>
        <exif:ExposureTime>1/125</exif:ExposureTime>
        <exif:FNumber>40/10</exif:FNumber>
        <exif:ShutterSpeedValue>223/32</exif:ShutterSpeedValue>
        <exif:ApertureValue>4000000/1000000</exif:ApertureValue>
        <exif:ExposureBiasValue>0/3</exif:ExposureBiasValue>
        <exif:MaxApertureValue>73/32</exif:MaxApertureValue>
        <exif:MeteringMode>5</exif:MeteringMode>
        <exif:Flash rdf:parseType="Resource">
           <exif:Fired>False</exif:Fired>
           <exif:Return>0</exif:Return>
           <exif:Mode>3</exif:Mode>
           <exif:Function>False</exif:Function>
           <exif:RedEyeMode>False</exif:RedEyeMode>
        </exif:Flash>
        <exif:FocalLength>358/32</exif:FocalLength>
        <exif:FocalPlaneXResolution>3072000/284</exif:FocalPlaneXResolution>
        <exif:FocalPlaneYResolution>2304000/213</exif:FocalPlaneYResolution>
        <exif:FocalPlaneResolutionUnit>2</exif:FocalPlaneResolutionUnit>
        <exif:SensingMethod>2</exif:SensingMethod>
        <exif:FileSource>3</exif:FileSource>
        <exif:CustomRendered>0</exif:CustomRendered>
        <exif:ExposureMode>0</exif:ExposureMode>
        <exif:WhiteBalance>0</exif:WhiteBalance>
        <exif:DigitalZoomRatio>3072/3072</exif:DigitalZoomRatio>
        <exif:SceneCaptureType>3</exif:SceneCaptureType>
     </rdf:Description>
     <rdf:Description rdf:about=""
           xmlns:dc="http;//purl.org/dc/elements/1.1/">
        <dc:format>image/jpeg</dc:format>
     </rdf:Description>
  </rdf:RDF>
</x:xmpmeta>
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