Trouble with using MagickGetSamplingFactors API

"google" <[email protected]> Thu, 20 Jun 2013 15:13:20 +0800
Newsgroups gmane.comp.video.graphicsmagick.apis
Message-ID <[email protected]>
Hi, all:
        I have trouble with using MagickGetSamplingFactors API, I need your help.  I call the MagickGetSamplingFactors function  to get the image samplimg factor, but I always get NULL. How can I get the image samplimg factor? Can you give me a example. Thanks you a lot again.

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