From c55f4e65e25acc3dc70889fb922421aa2634f9e7 Mon Sep 17 00:00:00 2001
From: Oliver Duis <oduis@hotmail.com>
Date: Tue, 2 Oct 2012 20:24:29 +0200
Subject: [PATCH] Fixed auto-exposure on image with large overexposed areas on
 behalf of Victor, see issue 1358

---
 rtengine/improcfun.cc | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/rtengine/improcfun.cc b/rtengine/improcfun.cc
index 52d757560..3cbe76f39 100644
--- a/rtengine/improcfun.cc
+++ b/rtengine/improcfun.cc
@@ -1196,7 +1196,7 @@ fclose(f);*/
 		//find average luminance
 		for (int i=0; i<imax; i++) {
 			sum += histogram[i];
-			ave += histogram[i] * i;
+			ave += histogram[i] *(float)i;
 		}
 		ave /= (sum);
 		
@@ -1253,6 +1253,10 @@ fclose(f);*/
 		if (octile[7]>log(imax+1)/log2(2)) {
 			octile[7]=1.5*octile[6]-0.5*octile[5];
 		}
+		for(int i=1; i<8; i++) {
+		  if (octile[i] == 0.0)
+		    octile[i] = octile[i-1];
+		}
 		// compute weighted average separation of octiles
 		// for future use in contrast setting
 		for (int i=1; i<6; i++) {