raster style contrast enhancement
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**Name**:

geoc raster style contrast enhancement

**Description**:

Create a contrast enhancement Raster SLD

**Arguments**:

   * -m --method: The method (normalize or histogram)

   * -g --gamma-value: The gamma value

   * -o --opacity: The opacity

   * --help : Print the help message

   * --web-help : Open help in a browser