Not entirely sure which bit you are trying to remove, but the web page your link goes to does not have a .jpg file in it when you save the page, but the page source code does include several entries like this:-
</div> <!-- Close Page -->
<div align="center"><div id="footer">
<br />Brought by <a href="http://cinexl.net/blog" title="Go to Black Minimalism Blog author">Black Minimalism</a> Theme<br />
<a href="http://www.bacemedia.com/paulfrancis/wordpress/?feed=rss2">RSS Entries</a> and <a href="http://www.bacemedia.com/paulfrancis/wordpress/?feed=comments-rss2">RSS Comments</a>
<!-- 23 queries. 0.344 seconds. -->
</div></div>
So I'd say that the "Black Minimalism" text you mention is being inserted by the html coding, not as a part of the jpeg image.....