High Resolution Image for Pdflatex

While preparing the camera-ready version for our CIKM demo, my colleagues and I found that the screenshot included in our paper appeared to be fairly blurry in the pdf version, even though the original .jpg file looks fine.

I searched online to try to find the solutions. After a few trials and errors, adding the following two lines into the beginning of the latex files (before \begin{document}) did the trick.

\pdfpxdimen=1in

\divide\pdfpxdimen by 300

The above solution basically forces the pdf file generated at a higher resolution (in this case, 300 dpi) so that everything, including the images, looks better.

The original solution comes from here.