Pour ton exemple suffit de regarder les Exifs :

Exif Version: 0230
Flashpix Version: 0100
Color Space: 1
Pixel X Dimension: 700
Pixel Y Dimension: 447
Components Configuration: YCbCr
User Comment: 264
Date Time Original: 2011:08:06 13:06:58
Date Time Digitized: 2011:08:06 13:06:58
Subsec Time: 45
Subsec Time Original: 45
Subsec Time Digitized: 45
Exposure Time: 1/80
F Number: 1.8
Exposure Program: Aperture priority
ISO Speed Ratings: 400
Shutter Speed Value: 6.375
Aperture Value: 1.625
Max Aperture Value: 1.75
Metering Mode: Pattern
Flash: Flash did not fire, compulsory flash mode
Focal Length: 50
Focal Plane X Resolution: 5728.176795580111
Focal Plane Y Resolution: 5808.403361344538
Focal Plane Resolution Unit: 2
Custom Rendered: Normal process
White Balance: Manual white balance
Scene Capture Type: Standard
InteroperabilityIFDPointer: 1288
Image Width: 5184
Image Height: 3456
ExifIFDPointer: 288
BitsPerSample: 3
PhotometricInterpretation: 2
Orientation: 1
SamplesPerPixel: 3
YCbCr Positioning: 2
X Resolution: 72
Y Resolution: 72
Resolution Unit: 2
Date Time: 2011:09:08 12:34:53
Make: Canon
Model: Canon EOS 600D
Software: Adobe Photoshop CS5 Windows