Just some information that people may, or may not, be aware of:

EXIF (Exchangeable Image File) data is created by digital cameras each time a photo is taken. The EXIF data in a photo file contains information such as the make and model of the camera, shutter speeds and more. This can be useful when comparing photos to see what settings gave the best results. Here is the EXIF data from one of my own photographs:

Model = u700,S700
Orientation = top/left
Software = Version 1.1
Date Time = 2007-06-13 16:08:30

Exposure Time = 1/20"
F Number = F4.5
Exposure Program = Normal program
ISO Speed Ratings = 64
Exif Version = Version 2.21
Date Time Original = 2007-06-13 16:08:30
Date Time Digitized = 2007-06-13 16:08:30
Exposure Bias Value = 0EV
Max Aperture Value = F3.4
Metering Mode = Pattern
Light Source = unknown
Flash = Flash did not fire, compulsory flash mode
Focal Length = 12.88mm
Maker Note = 1610 Byte
User Comment =
Flashpix Version = Version 1.0
Color Space = sRGB
Exif Image Width = 3072
Exif Image Height = 2304
File Source = DSC
Custom Rendered = Normal process
Exposure Mode = Auto exposure
White Balance = Auto white balance
Digital Zoom Ratio = 1x
Scene Capture Type = Normal
Gain Control = None
Contrast = Normal
Saturation = Normal
Sharpness = Normal

Thumbnail = 160 x 120

The most useful part of the above perhaps being the make and model of the camera. An EXIF viewer can be used to tell what camera was used to take a photo you might admire. Camera settings can be seen as well.

There are several free EXIF viewers available, plus a few that are Firefox extensions. A quick search will bring up some names. Once installed, a photograph on the Internet can be right-clicked and the EXIF data viewed.

Editing a photo will sometimes remove EXIF Data. It often will remain after editing though. Whether it does or not might depend on the editor used and/or perhaps the settings within the program's Options. If anyone would prefer not to have the data viewable, there are free programs that will strip EXIF data from the file (search: 'remove exif data'). Removing it also reduces file size (if that's important).
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