Wand gamma() function in Python
gamma() allows us to adjust the luminance of an image. Resulting pixels are defined as pixel^(1/gamma). The value of gamma is typically between 0.8 & 2.3 range, and value of 1.0 will not affect the resulting image.
|adjustment_value||numbers.Real||value to adjust gamma level.|
|channel||basestring||optional channel to apply gamma correction.|
Example 2: Increasing adjustment_value to 1.75.
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