rol the JPEG
"quality setting" (DCT quantization level).</p>

<blockquote>
<dl>
<dt><b><tt>-dJPEGQ=</tt></b><b><em>N</em></b> (integer from 0 to 100, default 75)
<dd>Set the quality level <b><em>N</em></b> according to the widely used
IJG quality scale, which balances the extent of compression against the
fidelity of the image when reconstituted.  Lower values drop more
information from the image to achieve higher compression, and therefore
have lower quality when reconstituted.

<dt><b><tt>-dQFactor=</tt><