From 7eda37a081ae4410faaeead2994c0f37c0509658 Mon Sep 17 00:00:00 2001
From: heckflosse <heckflosse67@gmx.de>
Date: Thu, 24 Nov 2016 19:28:11 +0100
Subject: [PATCH] pixelshift: adaptice method V3 (worse than V2 imho)

---
 rtengine/pixelshift.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/rtengine/pixelshift.cc b/rtengine/pixelshift.cc
index 4a3d9e7e6..4c1c1f122 100644
--- a/rtengine/pixelshift.cc
+++ b/rtengine/pixelshift.cc
@@ -51,7 +51,8 @@ float greenDiff(float a, float b, bool adaptive, float scale, float stddevFactor
         float stddev = sqrtf(avg + nreadIso * nreadIso + prnu * prnu);
 //        float korr = stddevFactor * stddev / (a * scale);      // V0: use G1 not scaled by eperIso
 //        float korr = stddevFactor * stddev / (maxVal * scale); // V1: use max(G1,G2) not scaled by eperIso
-        float korr = stddevFactor * stddev / (gDiff / (eperIso * scale)); // V2: use absolute difference abs(G1-G2) scaled by eperISo
+//        float korr = stddevFactor * stddev / (gDiff / (eperIso * scale)); // V2: use absolute difference abs(G1-G2) scaled by eperISo
+        float korr = stddevFactor * stddev / (gDiff * eperIso * scale); // V3: corrected version of V2
         diff -= korr;
     }
     return diff;