Original Converted to Black-and-White
Contrast Adjusted
Increase the contrast in black-and-white images to produce a stronger, more graphic picture. If the original is in color, first convert to black-and-white, then increase the contrast until you achieve the desired effect. This technique works well with silhouettes with clear outlines, and with objects with geometrical shapes or strong patterns.
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From How To Photograph Absolutely Everything: Successful Pictures From Your Digital Camera by Tom Ang (DK Publishing, 2007, $40)_
