Ghostscript error when converting PostScript to PDF file
<p>I convert a PDF with Ghostscript (9.20) to a PostScript File:</p>

<pre><code>pdf2ps original.pdf optimized.ps
</code></pre>

<p>and then try to reconvert the PostScript to a smaller PDF file with the -dPDFSETTINGS=/screen or /ebook option to hopefully obtain a smaller PDF file size in the end:</p>

<pre><code>ps2pdf -dPDFSETTINGS=/screen optimized.ps optimized.pdf
</code></pre>

<p>But then I get the following error during conversion:</p>

<pre><code>Subsample filter does not support non-integer downsample factor (2.400000)
Failed to initialise downsample filter, downsampling aborted
</code></pre>

<p>What's missing or what I'm doing wrong? Couldn't find any solutions yet… :-(</p>