Halftone images can be smoothed digitaly by applying a Gaussian blur filter. Original image taken from an interbellic newspaper.
<p><span lang="en">Anonymous</span><span style="display:none">Unknown author</span>
</p>
<br><a href="//commons.wikimedia.org/wiki/User:Alex:D" title="User:Alex:D">Alex:D</a>
1920s <div style="display: none;">date QS:P,+1920-00-00T00:00:00Z/8</div>-1930s<br>2008
<p>Interbellic newspaper
</p>
<br><span class="int-own-work" lang="en">Own work</span>