From d03907bcf89756e9fcd4a35bfc2ab8ffb55fab10 Mon Sep 17 00:00:00 2001
From: heckflosse <heckflosse67@gmx.de>
Date: Tue, 5 Jun 2018 15:09:32 +0200
Subject: [PATCH] Strange color artifacts in Jupiter, fixes #4587

---
 rtengine/green_equil_RT.cc | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/rtengine/green_equil_RT.cc b/rtengine/green_equil_RT.cc
index 934b7df4a..9706b06c1 100644
--- a/rtengine/green_equil_RT.cc
+++ b/rtengine/green_equil_RT.cc
@@ -46,13 +46,14 @@ void RawImageSource::green_equilibrate_global(array2D<float> &rawData)
 
     for (int i = border; i < H - border; i++) {
         double avgg = 0.;
-
+        int ng = 0;
         for (int j = border + ((FC(i, border) & 1) ^ 1); j < W - border; j += 2) {
-            avgg += rawData[i][j];
+            if(rawData[i][j] > 0.f) {
+                avgg += rawData[i][j];
+                ng++;
+            }
         }
 
-        int ng = (W - 2 * border + (FC(i, border) & 1)) / 2;
-
         if (i & 1) {
             avgg2 += avgg;
             ng2 += ng;