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<ol><p>Increase or decrease image contrast.</p></ol>
<h5>alpha</h5>
-<ol><p>control the "shoulder" of the contast curve.</p></ol>
+<ol><p>strength of the contrast, the larger the number the more 'threshold-like' it becomes.</p></ol>
<h5>beta</h5>
-<ol><p>control the "toe" of the contast curve.</p></ol>
+<ol><p>midpoint of the function as a color value 0 to QuantumRange.</p></ol>
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<h2><a href="http://www.imagemagick.org/api/MagickWand/magick-image