%
% o sharpen: Increase or decrease image contrast.
%
-% o contrast: control the "shoulder" of the contast curve.
+% o alpha: strength of the contrast, the larger the number the more
+% 'threshold-like' it becomes.
%
-% o midpoint: control the "toe" of the contast curve.
+% o beta: midpoint of the function as a color value 0 to QuantumRange.
%
*/
%
% o sharpen: Increase or decrease image contrast.
%
-% o alpha: control the "shoulder" of the contast curve.
+% o alpha: strength of the contrast, the larger the number the more
+% 'threshold-like' it becomes.
%
-% o beta: control the "toe" of the contast curve.
+% o beta: midpoint of the function as a color value 0 to QuantumRange.
%
*/