How to avoid bad quality image

Question

Possible Duplicate:
Included PNG appears blurry in PDF

I have a PNG image with a pretty good quality, but when I import this in beamer it has lost its quality, even if I maintain the 1.0 as scale factor. How can I avoid it? Is vectorial image the one solution? I grab this image from a website. I use this code to import image:

\begin{figure}[here]
\begin{center}
\includegraphics[scale=1.0]{img/dp2}
\end{center}
\end{figure}

I'm using pdflatex.

PS: I have no type of knowledge about graphic and photoediting. Original image, on the left looks bigger when imported ad 1 as scale factor

The image quality should not be changed. Could it be that you have a different version of the same file in the same directory, like img/dp2.jpg? \includegraphics tries a list of file extensions and by default JPG comes before PNG. Try it with the .png added. Also, how are you compiling the document? Using pdflatex or latex etc.? — Martin Scharrer, May 08 '12 at 08:29
BTW, the [here] is wrong, it should be [h]. See How to influence the position of float environments like figure and table in LaTeX? for more details about figure placement. Also see Should I use center or centering for figures and tables? to learn why you should use \centering instead of {center}. — Martin Scharrer, May 08 '12 at 08:31
With pdflatex there should be no problem. Please check the .log file if really the wanted image is used and not a different one. As I said, also try {img/dp2.png}. — Martin Scharrer, May 08 '12 at 08:39
No way. Image is 510x347 and when imported at full scale (1 factor) looks bigger than original (see image added to original question). — BAD_SEED, May 08 '12 at 08:58
How do you know that it has lost quality? What tests are you using? What happens if you include it in a normal LaTeX document (ie with the article class instead of beamer)? — Andrew Stacey, May 08 '12 at 08:58
Scale your image to three quarters of its original size, thus use scale=0.75. In the document it then should appear properly. — Thorsten Donig, May 08 '12 at 09:00
@ThorstenDonig it's properly fit horizzontally but not vertically. And result is always the same, completely bad. — BAD_SEED, May 08 '12 at 09:05
Ok, here we go: This is most likely be caused by a wrong image resolution. LaTeX seems to use a wrong number of DPIs. See Included png appears too big in PDF, which might help. Also opening and resaving the image might fix the DPI metadata. — Martin Scharrer, May 08 '12 at 09:06
Might be a duplicate of Included PNG appears blurry in PDF. Please have a look at the answers there. — Martin Scharrer, May 08 '12 at 09:08

How to avoid bad quality image

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