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[imagemagick] / MagickCore / composite.c

diff --git a/MagickCore/composite.c b/MagickCore/composite.c
index 3a8d0b8014338b5d720f188fe729c5c413982b2c..d604805b56d59fac1bc8555ffd647bd6b901edd0 100644 (file)
--- a/MagickCore/composite.c
+++ b/MagickCore/composite.c
@@ -13,11 +13,11 @@
 %                     MagickCore Image Composite Methods                      %
 %                                                                             %
 %                              Software Design                                %
-%                                John Cristy                                  %
+%                                   Cristy                                    %
 %                                 July 1992                                   %
 %                                                                             %
 %                                                                             %
-%  Copyright 1999-2013 ImageMagick Studio LLC, a non-profit organization      %
+%  Copyright 1999-2014 ImageMagick Studio LLC, a non-profit organization      %
 %  dedicated to making software imaging solutions freely available.           %
 %                                                                             %
 %  You may not use this file except in compliance with the License.  You may  %
@@ -1721,12 +1721,7 @@ MagickExport MagickBooleanType CompositeImage(Image *image,
           }
           case ColorDodgeCompositeOp:
           {
-            if ((fabs(Sca-Sa) < MagickEpsilon) && (fabs(Dca) < MagickEpsilon))
-              {
-                pixel=QuantumRange*gamma*(Sca*(1.0-Da)+Dca*(1.0-Sa));
-                break;
-              }
-            if (fabs(Sca-Sa) < MagickEpsilon)
+            if ((Sca*Da+Dca*Sa) >= Sa*Da)
               {
                 pixel=QuantumRange*gamma*(Sa*Da+Sca*(1.0-Da)+Dca*(1.0-Sa));
                 break;
@@ -1770,7 +1765,8 @@ MagickExport MagickBooleanType CompositeImage(Image *image,
           case CopyBlackCompositeOp:
           {
             if (channel == BlackPixelChannel)
-              pixel=(MagickRealType) GetPixelBlack(composite_image,p);
+              pixel=(MagickRealType) (QuantumRange-
+                GetPixelBlack(composite_image,p));
             break;
           }
           case CopyBlueCompositeOp:
@@ -2081,16 +2077,16 @@ MagickExport MagickBooleanType CompositeImage(Image *image,
           {
             pixel=Sc+Dc;
             if (pixel > QuantumRange)
-              pixel-=(QuantumRange+1.0);
-            pixel=gamma*(pixel*Sa*Da+Sa*Sc*(1.0-Da)+Da*Dc*(1.0-Sa));
+              pixel-=QuantumRange;
+            pixel=gamma*(Sa*Da*pixel+Sa*Sc*(1.0-Da)+Da*Dc*(1.0-Sa));
             break;
           }
           case ModulusSubtractCompositeOp:
           {
             pixel=Sc-Dc;
             if (pixel < 0.0)
-              pixel+=(QuantumRange+1.0);
-            pixel=gamma*(pixel*Sa*Da+Sa*Sc*(1.0-Da)+Da*Dc*(1.0-Sa));
+              pixel+=QuantumRange;
+            pixel=gamma*(Sa*Da*pixel+Sa*Sc*(1.0-Da)+Da*Dc*(1.0-Sa));
             break;
           }
           case MultiplyCompositeOp: