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<p>Gets the maximum post-processing level. </p>
<p>The decoder supports a post-processing filter that can improve the appearance of the decoded images. This returns the highest level setting for this post-processor, corresponding to maximum improvement and computational expense.</p>
<dl><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign="top"><tt>[out]</tt>&nbsp;</td><td valign="top"><em>_bu