Gyorgy Pota schrieb:
I tried three methods to produce a .pdf file from my .lyx file. Using
ae fonts as explained in the LyX manuals dvipdfm, pdflatex and ps2pdf
all produced beautiful fonts on the screen using Adobe Reader.
The UserGuide states in section 3.6.2 "Document Font and Font size"
---
As cm and ec are bitmap fonts, they often looks pixeled in PDF output, especially when you read the
PDF in a zoomed size. To get rid of pixeled fonts, you have to use a vector font. There are three
ways to use one:
• One way is to use the AE fonts. AE is a virtual font. Virtual means that it ``steals'' outline
cm-glyphs from other fonts. This has the disadvantage that some characters are missing, like the
French guillemets (``«'' and ``»'') and that accented characters are not one glyph, they are build
of two characters, the accent and the letter. Therefore you can't search in documents using the AE
fonts for words with accented characters. If you search for example for the French word ``rève'' in
a PDF, you won't get any result, because the PDF-viewer searches for the glyph `` è '' and not for
the glyph `` e + ''.
---
So the drawbacks of ae are described. The UserGuide section describes two
better font solutions.
However,
when I printed these .pdf files from Adobe Reader the printed texts were
of different quality. Pdflatex produced weak quality, the fonts were
"ragged", discontinuous and not black enough. Ps2pdf was better and
dvipdfm was the best.
The reason is the used font ae and the font embedding (I hope this explanation
is correct):
As ae is virtual, it is not a real font itself and can thus not be embedded to the PDF by pdflatex.
As far as I know ps2pdf embededs the different fonts from where ae uses the glyphs to the PostScript
file. This is then converted to a PDF. For dvipdfm I don't know how it handles ae.
When a used font is not embedded to the PDF, the corresponding fonts that are installed on the
computer where the PDF is displayed is used. So to be independent from this, use a real, if possible
vector font like Latin Modern, Helvetica, etc., because they could be embedded.
When using bitmap fonts Adobe Reader smoothes the font on screen, but they will eventuall appear in
the output pixeled anyway.
regards Uwe
