ss format and preview parameter</div><div class="line"><a name="l00221"></a><span class="lineno">  221</span>&#160;showPreview = strcmp(format,<span class="stringliteral">&#39;preview&#39;</span>);</div><div class="line"><a name="l00222"></a><span class="lineno">  222</span>&#160;<span class="keywordflow">if</span> showPreview</div><div class="line"><a name="l00223"></a><span class="lineno">  223</span>&#160;  format = <span class="stringliteral">&#39;png&#39;</span>;</div><div class="line"><a name="l00224"