diff --git a/imageviewer-qt4.cpp b/imageviewer-qt4.cpp
index 7f56a9c..976f4f5 100644
--- a/imageviewer-qt4.cpp
+++ b/imageviewer-qt4.cpp
@@ -384,8 +384,7 @@ void ImageViewer::partialLinearHistogrammAdaption() {
   }
   
   // Create histogramm map
-  // This will point every new brightness index to the old double value
-  // from the reference histogramm. (array with double index, but the other way around :/ )
+  // This represents the new cumulative histogramm built of linear parts
   double* histogramm_map = (double*) malloc(256*sizeof(double));
   for(int i=0; i<=number_parts; i++) {
     int current_n = parts[i];
@@ -395,7 +394,7 @@ void ImageViewer::partialLinearHistogrammAdaption() {
     double delta_i = reference_histogramm[current_n] - reference_histogramm[last_n];
     double m = delta_i / delta_n;
     double offset = histogramm_map[last_n];
-    // Calculate the mapping values
+    // Calculate the new cumulative values
     for(int j=last_n; j<=current_n; j++) {
       int delta_n = j - last_n;
       histogramm_map[j] = (offset + delta_n*m);
@@ -404,14 +403,12 @@ void ImageViewer::partialLinearHistogrammAdaption() {
   }
   
   // Build up the brightness map to apply on the image
-  // (basically reversing and applying the histogramm map)
+  // (basically inversing the histogramm map)
   int* brightness_map = (int*) malloc(256*sizeof(int));
+  int j=0;
   for(int i=0; i<256; i++) {
-    double old_brightness_occurrence = reference_histogramm[i];
-    int j = 0;
-    for(j=0; j<256; j++) {
-      if(old_brightness_occurrence < histogramm_map[j]) break;
-    }
+    double old_cumulative_brightness = reference_histogramm[i];
+    while(old_cumulative_brightness > histogramm_map[j]) j++;
     if(j > 255) j = 255;
     brightness_map[i] = j;
   }