From 6dfe6f95b88f896b2ade67033ae84282f245b2a6 Mon Sep 17 00:00:00 2001
From: Alberto Griggio <agriggio@users.noreply.github.com>
Date: Thu, 6 Apr 2017 09:00:53 +0200
Subject: [PATCH] Fix wrong computation of black levels (in some cases) in
 RawImage::get_colorsCoeff

Was happening e.g. with compressed DNG files
---
 rtengine/rawimage.cc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/rtengine/rawimage.cc b/rtengine/rawimage.cc
index 9bf0588a4..19fcb6c16 100644
--- a/rtengine/rawimage.cc
+++ b/rtengine/rawimage.cc
@@ -98,7 +98,10 @@ void RawImage::get_colorsCoeff( float *pre_mul_, float *scale_mul_, float *cblac
         }
     } else if ((this->get_cblack(4) + 1) / 2 == 1 && (this->get_cblack(5) + 1) / 2 == 1) {
         for (int c = 0; c < 4; c++) {
-            cblack_[FC(c / 2, c % 2)] = this->get_cblack(6 + c / 2 % this->get_cblack(4) * this->get_cblack(5) + c % 2 % this->get_cblack(5));
+            cblack_[c] = this->get_cblack(c);
+        }
+        for (int c = 0; c < 4; c++) {
+            cblack_[FC(c / 2, c % 2)] += this->get_cblack(6 + c / 2 % this->get_cblack(4) * this->get_cblack(5) + c % 2 % this->get_cblack(5));
             pre_mul_[c] = this->get_pre_mul(c);
         }
     } else {