commit d7b6969d38eacf065238d1e501cebbe44a1e2730
Author: Omari Stephens <xsdg@xsdg.org>
Date:   Sun Jan 24 08:22:18 2010 +0000

    Bug 599065 - don't set sRGB chunk by default
    
    If the image has neither a gamma set nor a color profile set, then we should
    leave the image untagged.  We should not tag as sRGB by default.

diff --git a/plug-ins/common/file-png.c b/plug-ins/common/file-png.c
index e906951..6d1e517 100644
--- a/plug-ins/common/file-png.c
+++ b/plug-ins/common/file-png.c
@@ -1453,10 +1453,6 @@ save_image (const gchar  *filename,
 
         g_free (profile_name);
       }
-    else if (! pngvals.gama)
-      {
-        png_set_sRGB (pp, info, 0);
-      }
   }
 #endif