[R] Artifacts in pdf() of image()

[Ben Bolker]

Michael Kubovy <kubovy <at> virginia.edu> writes:

> 
> Dear r-helpers,
> 
> I have two questions:
> 
> (1) The following produces a pdf with artifacts. How do I prevent them?
> 
>

  You don't say what the artifacts are, but I suspect
you're seeing the effects of anti-aliasing:

http://finzi.psych.upenn.edu/R/Rhelp02a/archive/30581.html
http://finzi.psych.upenn.edu/R/Rhelp02a/archive/71592.html

  does it happen when you print?

  On Ubuntu 7.04 I see a grid in evince; not in xpdf
or acrobat reader; and in gv (but I can turn it off with 'a')

  Ben Bolker