Image size using ping and blobs

Hi,

I've noticed some differences with the way Magick::ping()
works between 
if you use it via passing a filename directly (using a
std::string), or 
passing it a Magick::Blob.  When I pass the filename
directly, I get the 
correct columns() and rows() values, but when I pass it a
Blob it seems 
to give me the size of the EXIF thumbnail instead (for JPEG
images -- I 
haven't tried it with any other kinds of images).  As far
as I know I'm 
reading the whole image into memory correctly.  I'm using 
ImageMagick-6.2.5 on Windows XP.

Thanks,
;) james.
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