Add i.colors.enhance algorithm

python/plugins/processing/algs/grass7/description/i.colors.enhance.txt

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+i.colors.enhance
+Performs auto-balancing of colors for RGB images.
+Imagery (i.*)
+ParameterRaster|red|Name of red channel|False
+ParameterRaster|green|Name of green channel|False
+ParameterRaster|blue|Name of blue channel|False
+ParameterNumber|strength|Cropping intensity (upper brightness level)|0|100|98|True
+*ParameterBoolean|-f|Extend colors to full range of data on each channel|False
+*ParameterBoolean|-p|Preserve relative colors, adjust brightness only|False
+*ParameterBoolean|-r|Reset to standard color range|False
+*ParameterBoolean|-s|Process bands serially (default: run in parallel)|False
+OutputRaster|redoutput|Enhanced Red
+OutputRaster|greenoutput|Enhanced Green
+OutputRaster|blueoutput|Enhanced Blue
+

python/plugins/processing/algs/grass7/ext/i_colors_enhance.py

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+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    i_colors_enhance.py
+    -------------------
+    Date                 : March 2016
+    Copyright            : (C) 2016 by Médéric Ribreux
+    Email                : medspx at medspx dot fr
+***************************************************************************
+*                                                                         *
+*   This program is free software; you can redistribute it and/or modify  *
+*   it under the terms of the GNU General Public License as published by  *
+*   the Free Software Foundation; either version 2 of the License, or     *
+*   (at your option) any later version.                                   *
+*                                                                         *
+***************************************************************************
+"""
+
+__author__ = 'Médéric Ribreux'
+__date__ = 'March 2016'
+__copyright__ = '(C) 2016, Médéric Ribreux'
+
+# This will get replaced with a git SHA1 when you do a git archive
+
+__revision__ = '$Format:%H$'
+
+from i import exportInputRasters
+
+
+def processCommand(alg):
+
+    # Temporary remove outputs:
+    outputs = [alg.getOutputFromName('{}output'.format(f)) for f in ['red', 'green', 'blue']]
+    for out in outputs:
+        alg.removeOutputFromName(out.name)
+
+    alg.processCommand()
+
+    # Re-add outputs
+    for output in outputs:
+        alg.addOutput(output)
+
+
+def processOutputs(alg):
+    # Input rasters are output rasters
+    rasterDic = {'red': 'redoutput', 'green': 'greenoutput', 'blue': 'blueoutput'}
+    exportInputRasters(alg, rasterDic)