diff --git a/example/RefractiveIndex.cpp b/example/RefractiveIndex.cpp
index ae0364a..73406a0 100644
--- a/example/RefractiveIndex.cpp
+++ b/example/RefractiveIndex.cpp
@@ -19,7 +19,7 @@
 #define CAMERA_ACQU_WIDTH   640
 #define CAMERA_ACQU_HEIGHT  480
 
-#define LOCATION            "BRADFORD"
+#define LOCATION            "MANCHESTER"
 
 #define ISTATE_UNDEF        0xEEEE
 #define ISTATE_START        0xAAAA
@@ -216,7 +216,7 @@ void RefractiveIndex::draw()
            
     if(_currentAnalysis){
         _currentAnalysis->draw();
-        cout<<_currentAnalysis->meshIsComplete<<endl;
+        
         if(_currentAnalysis->meshIsComplete){
             fbo.begin();
             
@@ -231,7 +231,7 @@ void RefractiveIndex::draw()
              fbo.end();
             ofPixels pixels;
             fbo.readToPixels(pixels);
-            cout<<_currentAnalysis->meshFileName<<endl;
+            
 
             ofSaveImage(pixels,_currentAnalysis->meshFileName, OF_IMAGE_QUALITY_BEST);
             //saving jpgs doesn't work maybe because of of_image_quality
diff --git a/src/IResponseAnalysis.cpp b/src/IResponseAnalysis.cpp
index df3c795..969fdd4 100755
--- a/src/IResponseAnalysis.cpp
+++ b/src/IResponseAnalysis.cpp
@@ -195,7 +195,9 @@ void IResponseAnalysis::synthesise()
                 setMeshFromPixels(make3DZmap(image1, image5, _background), image1,image5, aMesh);
                 //with jpgs this was refusing to save out
                 meshFileName = _whole_file_path_synthesis+"/"+ofToString(_synth_save_cnt, 2)+"_IResponseSynthesis_"+ofToString(_run_cnt,2)+".png";
-                //flag that we are finished                
+                _saved_filenames_synthesis.push_back(meshFileName);
+
+                //flag that we are finished  
                 meshIsComplete=true;
                 _synth_save_cnt++;
             }
@@ -484,10 +486,11 @@ ofPixels IResponseAnalysis::make3DZmap(ofImage &image1, ofImage &image2, ofImage
             ofColor colourImage2 = imagePixels2.getColor(x, y);
             
             float _distanceToCentre=ofDist(imagePixels1.getWidth()/2, imagePixels1.getHeight()/2, x, y);
-            float _presumedBrightness=ofMap( sqrt(_distanceToCentre), 0,  sqrt(_maxPossibleDistanceToCentre), 0, 255);
-            
+            float _presumedBrightness=ofMap( sqrt(_maxPossibleDistanceToCentre)-sqrt(_distanceToCentre), 0,  sqrt(_maxPossibleDistanceToCentre), 0, 255);
+            //float _presumedBrightness=255;
             int thisDiff=abs(colourImage1.getBrightness()-_presumedBrightness);
-            
+            //cout<<thisDiff<< " thisDiff "<<endl;
+
             thesePixels[i]=thisDiff;
             thesePixels[i+1]=thisDiff;
             thesePixels[i+2]=thisDiff;