# \includegraphics[scale] makes plot figure (PDF) from smooth to serrated

I plot a function in Scilab and export to pdf image file. The pdf file looks very smooth as following.

However, when I tried to include this smooth pdf file in LaTeX. It becomes serrated like.

The code snippet I used.

\begin{figure}
\centering
\includegraphics[scale=.35]{hello.pdf}
\end{figure}


Is there a way to make it look more smooth? Should I sample smaller points of the function?

• Do you have a printer? Is the bad quality present in print as well? – pkofod Jan 23 '14 at 9:31
• This looks like it's just a viewer issue. Could you try a different PDF viewer? – Jake Jan 23 '14 at 9:32
• @pkofod Thank you. I tried it on Windows adobe reader, it looks OK. How could I never thought about that. – Peng Zhang Jan 23 '14 at 9:47
• @Jake Could you write a answer and then I would close it. The culprit is the Document Viewer on Ubuntu. Otherwise, I have to delete this post. – Peng Zhang Jan 23 '14 at 9:48