From 201f0c995969c480e7cf0285e5826c4c6903b7a1 Mon Sep 17 00:00:00 2001
From: glennrp <glennrp@git.imagemagick.org>
Date: Sat, 28 Jun 2014 16:13:49 +0000
Subject: [PATCH] Don't let libpng16 check the ICC/sRGB profile; we do that
 ourselves anyway.

---
 coders/png.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/coders/png.c b/coders/png.c
index ffe8b0ee4..9463abe68 100644
--- a/coders/png.c
+++ b/coders/png.c
@@ -2410,6 +2410,13 @@ static Image *ReadOnePNGImage(MngInfo *mng_info,
 
        if (value != NULL)
           ping_preserve_iCCP=MagickTrue;
+
+#if defined(PNG_SKIP_sRGB_CHECK_PROFILE) && defined(PNG_SET_OPTION_SUPPORTED)
+       /* Don't let libpng check for ICC/sRGB profile because we're going
+        * to do that anyway.  This feature was added at libpng-1.6.12.
+        */
+       png_set_option(ping, PNG_SKIP_sRGB_CHECK_PROFILE, PNG_OPTION_ON);
+#endif
     }
 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
     else
-- 
2.50.1