Re: Concerned about quality of images in end pdf

"p8mode" <p8mode@xxxxxxx> schrieb:

> I create a pdf document via (.tex + eps files) -> dvi -> ps -> pdf
> using LaTeX, dvips, and distiller /ghostview.
>
> The eps files themselves are lossless right, like png (ie converting an
> image to eps results in no loss of quality, right)?
>
> I sometimes scaled the image in the tex file via eg.
>
> \includegraphics[width = \myBigGraphicWidth, keepaspectratio=true]
>
> I tell distiller/ghostview not to downsample images, as best I can see
> possible. Can I expect there to be no quality loss from the original
> eps files in the final pdf document despite the multi step process?

eps-files can be real vector images -- in which case there shouldn't be
a quality loss, but they can also contain bitmaps e.g., if you had use
jpeg2ps, in which case the quality depends on the printed "dots per
inch" and can change when you scale the image or use another printer.

You can test the quality by making a pdf and then using a very large
zoom in the reader.


> If I used pdfLatex and png images could I expect the same quality pdf
> (regardless or whether I use 8 bit or 24 bit png images)?

png are bitmaps. So scaling changes the quality.



--
Ulrike Fischer
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.

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