/b><b><em>M</em></b> (float from 0.0 to 1.0)
<dd>Adobe's QFactor quality scale, which you may use in place of
<b><tt>JPEGQ</tt></b> above.  The QFactor scale is used by PostScript's
DCTEncode filter but is nearly unheard-of elsewhere.
</dl>
</blockquote>

<p>
At this writing the default JPEG quality level of 75 is equivalent to
<b><tt>-dQFactor=0.5</tt></b>, but the JPEG default might change in the
future.  There is currently no support for any additional JPEG
compression options, such as the other DCTEncod