Often people upload photos to photo sharing sites like facebook or flikr and apply what they think is a black and white look to it. However, this is not a real black and white look; real being the result of B&W film. All that is occuring is the lowering or removal of color saturation. What is left are simply shades of grey. Although sometimes grayscale comes close, it often doesn't properly give the same feel as a real B&W photograph. One characteristic that lacks in a grayscale image is the "dirty graininess" of a B&W film. The difference can be seen here.
Grayscale vs.Black & White
Click to view large size
The grayscale photo has no colour but what remains is a flat photo with no depth and no contrast. A real B&W photograph has much contrast, depth and a often a more rough feel to it.
Here's a great site (as mentioned in previous posting) to give that photo a true B&W look.
http://www.picnik.com/app#/home/welcome
Watch for a future posting on B&W photography.
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