R help - Dec 2006 - black and white colormodel for postscript figure

hi! 

I would like to produce simple black and white postscript figures for 
publishing.   A black/white or grayscale or CMYK colormodel can be used, but not
RGB colours.

Can I produce postscript graphs in R that satisfy this? 

Following an earlier advice on the help-list I have tried using Photoshop to 
convert - but this seems to convert the vector format into raster format - 
giving larger, but less precise figures.

many thanks in advance
Bent Nielsen

On Tue, 12 Dec 2006, Bent Nielsen wrote:
> I would like to produce simple black and white postscript figures for
> publishing.   A black/white or grayscale or CMYK colormodel can be used,
but not
> RGB colours.
>
> Can I produce postscript graphs in R that satisfy this?
Unfortunately not directly: the graphics driver only uses RGB.

However, if the plot only contains 'black and white', it probably
actually
only contains black, indicated by '0 0 0 rgb' (as white is normally 
transparent).  Edit that to '0 setgray'.  If you do have any white, edit
'1 1 1 rgb' to '1 setgray'.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595