From 6b7677c1276ec88585e6d2ab44fce25eefd30c9a Mon Sep 17 00:00:00 2001
From: cristy <urban-warrior@git.imagemagick.org>
Date: Sun, 1 Jan 2012 20:59:57 +0000
Subject: [PATCH]

---
 coders/png.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/coders/png.c b/coders/png.c
index e9938612a..324b41a67 100644
--- a/coders/png.c
+++ b/coders/png.c
@@ -3284,6 +3284,7 @@ static Image *ReadOnePNGImage(MngInfo *mng_info,
             {
               for (x=0; x < ping_num_trans; x++)
               {
+                 image->colormap[x].matte=MagickTrue;
                  image->colormap[x].alpha =
                    ScaleCharToQuantum((unsigned char)ping_trans_alpha[x]);
               }
@@ -3296,6 +3297,7 @@ static Image *ReadOnePNGImage(MngInfo *mng_info,
                  if (ScaleQuantumToShort(image->colormap[x].red) ==
                      transparent_color.alpha)
                  {
+                    image->colormap[x].matte=MagickTrue;
                     image->colormap[x].alpha = (Quantum) TransparentAlpha;
                  }
               }
-- 
2.40.0