Add i.pansharpen algorithm

python/plugins/processing/algs/grass7/description/i.pansharpen.txt

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+i.pansharpen
+Image fusion algorithms to sharpen multispectral with high-res panchromatic channels
+Imagery (i.*)
+ParameterRaster|red|Name of red channel|False
+ParameterRaster|green|Name of green channel|False
+ParameterRaster|blue|Name of blue channel|False
+ParameterRaster|pan|Name of raster map to be used for high resolution panchromatic channel|False
+ParameterSelection|method|Method|brovey;ihs;pca|1
+*ParameterBoolean|-l|Rebalance blue channel for LANDSAT|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_pansharpen.py

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+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    i_pansharpen.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
+from processing.core.parameters import ParameterRaster, getParameterFromString
+
+
+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)
+
+    # create a false output
+    base = getParameterFromString('ParameterString|output|Name for output basename raster map(s)|None|False|False')
+    base.value = alg.getTempFilename()
+    alg.addParameter(base)
+    alg.processCommand()
+
+    # Re-add outputs
+    for output in outputs:
+        alg.addOutput(output)
+
+
+def processOutputs(alg):
+    base = alg.getParameterValue('output')
+    for channel in ['red', 'green', 'blue']:
+        command = 'r.out.gdal -c -t -f --overwrite createopt="TFW=YES,COMPRESS=LZW" input={} output=\"{}\"'.format(
+            '{}_{}'.format(base, channel),
+            alg.getOutputValue('{}output'.format(channel))
+        )
+        alg.commands.append(command)
+        alg.outputCommands.append(command)