fix Processing GDAL near black tool

Author: Giovanni Manghi

python/plugins/processing/algs/gdal/nearblack.py

@@ -43,22 +43,25 @@ class nearblack(GdalAlgorithm):
     def defineCharacteristics(self):
         self.name, self.i18n_name = self.trAlgorithm('Near black')
         self.group, self.i18n_group = self.trAlgorithm('[GDAL] Analysis')
-        self.addParameter(ParameterRaster(nearblack.INPUT,
+        self.addParameter(ParameterRaster(self.INPUT,
                                           self.tr('Input layer'), False))
-        self.addParameter(ParameterNumber(nearblack.NEAR,
+        self.addParameter(ParameterNumber(self.NEAR,
                                           self.tr('How far from black (white)'), 0, None, 15))
-        self.addParameter(ParameterBoolean(nearblack.WHITE,
+        self.addParameter(ParameterBoolean(self.WHITE,
                                            self.tr('Search for nearly white pixels instead of nearly black'),
                                            False))
-        self.addOutput(OutputRaster(nearblack.OUTPUT, self.tr('Nearblack')))
+        self.addOutput(OutputRaster(self.OUTPUT, self.tr('Nearblack')))
 
     def getConsoleCommands(self):
         arguments = []
         arguments.append('-o')
-        arguments.append(self.getOutputValue(nearblack.OUTPUT))
+        output = unicode(self.getOutputValue(self.OUTPUT))
+        arguments.append(output)
+        arguments.append('-of')
+        arguments.append(GdalUtils.getFormatShortNameFromFilename(output))		
         arguments.append('-near')
-        arguments.append(unicode(self.getParameterValue(nearblack.NEAR)))
-        if self.getParameterValue(nearblack.WHITE):
+        arguments.append(unicode(self.getParameterValue(self.NEAR)))
+        if self.getParameterValue(self.WHITE):
             arguments.append('-white')
-        arguments.append(self.getParameterValue(nearblack.INPUT))
+        arguments.append(self.getParameterValue(self.INPUT))
         return ['nearblack', GdalUtils.escapeAndJoin(arguments)]