Firstly I was told, that the problem was in my ghostscript-installation which is called by the bitmap-function - not in R itself.
I got a lot of good suggestions (also off-list) about what problems in my ghostscript-installation might give some low-quality font-sharpeness in my jpg-grafics produced by bitmap. I tried options like (res=150, point=15....) - and substituted jpeg with png - but wasn't able to find out why ghostscript selects the bad fonts (or what might be the problem) when producing a png/jpg-image through the bitmap-function. I was actually able to produce nice-looking png's doing the steps:
1. Using bitmap to produce a pdf-file
2. invoking ghostscript from my bash-shell and converting the pdf-file produced by the bitmap-function into a png-image. ( gs -sDEVICE=png256 -r150 -dBATCH -sOutputFile=barplotx_normal.png /usr/share/ghostscript/7.05/examples/barplotx_normal.pdf)
In the end the best suggestion was to try another approach using the png-function in R instead of the bitmap-function.
/Niels
R1.8.0 Linux redhat 9 GhostScript version 7.05
Cand. Polit. Niels Steen Krogh Solsortvej 44 2000 F.
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