diff --git a/schainpy/Graphics/BaseGraph.py b/schainpy/Graphics/BaseGraph.py
index b259cb9..df45b8b 100644
--- a/schainpy/Graphics/BaseGraph.py
+++ b/schainpy/Graphics/BaseGraph.py
@@ -191,17 +191,17 @@ def cmap1_init(colormap="gray"):
 def setColormap(colormap="jet"):
     cmap1_init(colormap)
 
-def savePlplot(indexPlot,filename,ncol,nrow,width,height):
+def savePlplot(filename,width,height):
     curr_strm = plplot.plgstrm()
     save_strm = plplot.plmkstrm()
-    plplot.plsetopt("geometry", "%dx%d"%(width*ncol,height*nrow))
-    plplot.plsdev("pngcairo")
+    plplot.plsetopt("geometry", "%dx%d"%(width,height))
+    plplot.plsdev("png")
     plplot.plsfnam(filename)
     plplot.plcpstrm(curr_strm,0)
     plplot.plreplot()
+    plplot.plclear()
     plplot.plend1()
-    plplot.plsstrm(indexPlot)
-    print ''
+    plplot.plsstrm(curr_strm)
     
 
 def initPlplot(indexPlot,ncol,nrow,winTitle,width,height):
@@ -740,7 +740,9 @@ class SpectraPlot:
         now = datetime.datetime.now().timetuple()
         file = "spc_img%02d_%03d_%02d%02d%02d"%(indexPlot,now[7],now[3],now[4],now[5])
         filename = os.path.join(path,file+".png")
-        savePlplot(indexPlot,filename,self.ncol,self.nrow,self.width,self.height)
+        width = self.width*self.ncol
+        hei = self.height*self.nrow
+        savePlplot(filename,width,hei)
         
             
     
diff --git a/schainpy/Processing/JRONoise.py b/schainpy/Processing/JRONoise.py
index e1a4379..3a7e0ef 100644
--- a/schainpy/Processing/JRONoise.py
+++ b/schainpy/Processing/JRONoise.py
@@ -148,7 +148,7 @@ class Noise:
         """
         
         if data == None:
-            return 0
+            raise ValueError, "The data value is not defined"
         
         shape = data.shape
         self.dim = len(shape)
diff --git a/schainpy/Processing/SpectraProcessor.py b/schainpy/Processing/SpectraProcessor.py
index a58b246..6f5d91f 100644
--- a/schainpy/Processing/SpectraProcessor.py
+++ b/schainpy/Processing/SpectraProcessor.py
@@ -239,7 +239,8 @@ class SpectraProcessor:
         self.dataOutObj.data_dc = dc
         self.dataOutObj.m_ProcessingHeader.blockSize = blocksize
         self.dataOutObj.m_BasicHeader.utc = self.dataInObj.m_BasicHeader.utc
-
+        
+        self.getNoise()
         
     def addWriter(self,wrpath):
         objWriter = SpectraWriter(self.dataOutObj)
@@ -329,7 +330,7 @@ class SpectraProcessor:
             #print "myIncohIntObj.navg: ",myIncohIntObj.navg
             self.dataOutObj.flagNoData = False
             
-            self.getNoise(type="hildebrand",parm=myIncohIntObj.navg)
+            self.getNoise(type="hildebrand")
 #            self.getNoise(type="sort", parm=16)
             
         else:
@@ -357,6 +358,9 @@ class SpectraProcessor:
     
     def getNoise(self, type="hildebrand", parm=None):
         
+        if parm == None:
+            parm =self.dataOutObj.m_ProcessingHeader.incoherentInt
+            
         self.noiseObj.setNoise(self.dataOutObj.data_spc)
         
         if type == "hildebrand":