From: glennrp <glennrp@git.imagemagick.org>
Date: Sat, 20 Aug 2011 04:40:26 +0000 (+0000)
Subject: OpaqueAlpha and TransparentAlpha were mixed up in the PNG8 encoder.
X-Git-Tag: 7.0.1-0~7174
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=f73547f51486ebeea44ebe7236477424304ed320;p=imagemagick

OpaqueAlpha and TransparentAlpha were mixed up in the PNG8 encoder.
---

diff --git a/coders/png.c b/coders/png.c
index 19a7c035f..d54ff54e2 100644
--- a/coders/png.c
+++ b/coders/png.c
@@ -8400,7 +8400,7 @@ static MagickBooleanType WriteOnePNGImage(MngInfo *mng_info,
 
           for (x=0; x < (ssize_t) image->columns; x++)
           {
-              if (GetPixelAlpha(image,r) > TransparentAlpha/2)
+              if (GetPixelAlpha(image,r) < OpaqueAlpha/2)
                 {
                   SetPixelPacket(image,&image->background_color,r);
                   SetPixelAlpha(image,TransparentAlpha,r);