[R] howto improve sharpeness of fonts in a jpg-image producedby R ?

Niels Steen Krogh nielssteenkrogh at hotmail.com
Wed Nov 19 13:50:01 CET 2003

My original question had the subject of making jpg-image files with the 

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         

In the end the best suggestion was to try another approach using the 
png-function in R instead of the bitmap-function.


Linux redhat 9
GhostScript version 7.05

Cand. Polit.
Niels Steen Krogh
Solsortvej 44
2000 F.

Tlf: 3888 8613

ZiteLab / EmpoweR youR data with R, Zope and SOAP

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