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I have been looking for a possible answer for this problem (it seems that I am not the only one facing this), but the answers do not help too much.

I got this image (.png) which I consider having a good quality even when I see it in lyx. But as soon as I create the pdf (using pdflatex) the resolution of the image decrease as you can see. enter image description here enter image description here

I got not idea about why this is happening, almost everyone in other answers says that .png images should appear like they are.

Do you have any idea about this?

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closed as unclear what you're asking by Torbjørn T., Martin Schröder, Peter Jansson, Svend Tveskæg, Jubobs Mar 9 '14 at 22:02

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question.If this question can be reworded to fit the rules in the help center, please edit the question.

PNG is a raster graphics type. When it is scaled (especially to be made larger), the image will lose visual quality. (This is one of the reasons it is preferable to use vector graphics, such as PDF, instead of the far more common raster graphics.) – Sean Allred Sep 13 '13 at 19:05
@user2343521: I think this is the same problem as My pixel perfect picture gets blurry when compiled in LaTex: The image is unchanged, but the viewer (like Acrobat Reader) smoothes it. – Jake Sep 13 '13 at 19:13
Sean Allred, thanks a lot for your replay. Before to put this question I looked for some reasons and in almost all of them the answer said that pdflatex do not change the quality of the images. tex.stackexchange.com/questions/38555/… – user2343521 Sep 13 '13 at 19:17
@user2343521: Have you tried opening the file in a different viewer or disabling the image smoothing in the viewer? – Jake Sep 13 '13 at 19:22
@Jake Nothing seems to work, I have used different viewer but result are even worst in some cases. – user2343521 Sep 13 '13 at 20:02