From 189f474e033c908ed06bfcb32580ab63427b9ad0 Mon Sep 17 00:00:00 2001
From: Ingo Weyrich <heckflosse67@gmx.de>
Date: Sun, 22 Sep 2019 20:53:03 +0200
Subject: [PATCH] dehaze: add accidently removed early exit in case there is no
 haze detected, #5456

---
 rtengine/ipdehaze.cc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/rtengine/ipdehaze.cc b/rtengine/ipdehaze.cc
index 125fa4d60..00236d1de 100644
--- a/rtengine/ipdehaze.cc
+++ b/rtengine/ipdehaze.cc
@@ -257,6 +257,13 @@ BENCHFUN
             }
         }
 
+        if (min(ambient[0], ambient[1], ambient[2]) < 0.01f) {
+            if (options.rtSettings.verbose) {
+                std::cout << "dehaze: no haze detected" << std::endl;
+            }
+            img->normalizeFloatTo65535();
+            return; // probably no haze at all
+        }
         patchsize = max(max(W, H) / 600, 2);
 
         if (options.rtSettings.verbose) {