From 5e1f65ecde087098550caf69f5973a4ca39f61f7 Mon Sep 17 00:00:00 2001
From: Oliver Duis <oduis@hotmail.com>
Date: Sun, 2 Oct 2011 20:06:58 +0200
Subject: [PATCH] Fixed black highlights when increasing Lab saturation on some
 occasions see issue 1025

---
 rtengine/improcfun.cc | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/rtengine/improcfun.cc b/rtengine/improcfun.cc
index c315f0301..2c0eab725 100644
--- a/rtengine/improcfun.cc
+++ b/rtengine/improcfun.cc
@@ -477,14 +477,13 @@ void ImProcFunctions::chrominanceCurve (LabImage* lold, LabImage* lnew, LUTf & a
 			float atmp = acurve[lold->a[i][j]+32768.0f]-32768.0f;
 			float btmp = bcurve[lold->b[i][j]+32768.0f]-32768.0f;
 			
-			if (params->labCurve.saturation) {
+			if (params->labCurve.saturation && fabs(atmp)<32768.0f && fabs(btmp)<32768.0f) {
 				float chroma = sqrt(SQR(atmp)+SQR(btmp)+0.001);
 				float satfactor = (satcurve[chroma+32768.0f]-32768.0f)/chroma;
 				atmp *= satfactor;
 				btmp *= satfactor;
 			}
 			
-            //double real_c = 1.0;
             if (params->labCurve.avoidclip) {
 				//Luv limiter
 				float Y,u,v;