Fix color-axis handling for arrays of type logical

functions/plotting/showImage.m

@@ -50,9 +50,15 @@ end
 image = squeeze(image);
 h = imagesc(image);
 axis equal tight off; colorbar;
-image = medfilt2(image,'symmetric');
-minVal = min(image(:));
-maxVal = max(image(:));
-caxis([minVal maxVal]);
+
+% determine reasonable range of color axis
+if islogical(image)
+    caxis([0,1]);
+else
+    image = medfilt2(image,'symmetric');
+    minVal = min(image(:));
+    maxVal = max(image(:));
+    caxis([minVal maxVal]);
+end
 
 end