From: anthony <anthony@git.imagemagick.org>
Date: Sun, 29 Apr 2012 11:46:27 +0000 (+0000)
Subject: (no commit message)
X-Git-Tag: 7.0.1-0~5699
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=fb2cc88134c9c433fb928baaac7ee7578ed57b0a;p=imagemagick

---

diff --git a/MagickCore/attribute.c b/MagickCore/attribute.c
index 0274fd5d0..7eb5448c5 100644
--- a/MagickCore/attribute.c
+++ b/MagickCore/attribute.c
@@ -809,7 +809,9 @@ MagickExport MagickBooleanType IsImageMonochrome(const Image *image,
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
 %  IsImageOpaque() returns MagickTrue if none of the pixels in the image have
-%  an opacity value other than opaque (0).
+%  an alpha value other than OpaqueAlpha (QuantumRange).
+%
+%  Will return true immediatally is alpha channel is not available.
 %
 %  The format of the IsImageOpaque method is:
 %
@@ -845,8 +847,10 @@ MagickExport MagickBooleanType IsImageOpaque(const Image *image,
   assert(image->signature == MagickSignature);
   if (image->debug != MagickFalse)
     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
+
   if (image->matte == MagickFalse)
     return(MagickTrue);
+
   image_view=AcquireVirtualCacheView(image,exception);
   for (y=0; y < (ssize_t) image->rows; y++)
   {