From: glennrp <glennrp@git.imagemagick.org>
Date: Fri, 1 Apr 2011 22:51:14 +0000 (+0000)
Subject: Make the png encoder treat incoming image depth as 8 if it is less than 8.
X-Git-Tag: 7.0.1-0~7790
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=70e68a844517efda3094dc170a8f54affc9c82bc;p=imagemagick

Make the png encoder treat incoming image depth as 8 if it is less than 8.
---

diff --git a/coders/png.c b/coders/png.c
index ac3ce4e32..67f187df9 100644
--- a/coders/png.c
+++ b/coders/png.c
@@ -7092,6 +7092,8 @@ static MagickBooleanType WriteOnePNGImage(MngInfo *mng_info,
     }
 #endif
 
+  if (image->depth < 8)
+     image->depth=8;
 
 #if (MAGICKCORE_QUANTUM_DEPTH > 16)
   /* PNG does not handle depths greater than 16 so reduce it even