Check for sampling-factor option only if sampling-factor image property is NULL.

[imagemagick] / coders / null.c

diff --git a/coders/null.c b/coders/null.c
index 96088d18f901662e2237a757d66e5a3a6b8cb94e..5770b9cf11b5df9f469979ba9f91c9af38395821 100644 (file)
--- a/coders/null.c
+++ b/coders/null.c
@@ -126,9 +126,9 @@ static Image *ReadNULLImage(const ImageInfo *image_info,
     image->columns=1;
   if (image->rows == 0)
     image->rows=1;
-  image->matte=MagickTrue;
+  image->alpha_trait=BlendPixelTrait;
   GetPixelInfo(image,&background);
-  background.alpha=(MagickRealType) TransparentAlpha;
+  background.alpha=(double) TransparentAlpha;
   if (image->colorspace == CMYKColorspace)
     ConvertRGBToCMYK(&background);
   for (y=0; y < (ssize_t) image->rows; y++)