[R] Colour depth reduced to 12 by bitmap devices
Prof Brian D Ripley
ripley at stats.ox.ac.uk
Thu Jun 29 11:19:21 CEST 2000
On Thu, 29 Jun 2000, Prof Brian D Ripley wrote:
> On Thu, 29 Jun 2000, Clive Jenkins wrote:
> > I am using R to create colour plots as bitmap files. I have created a
> > palette of 256 colours that I want to use, but the resultant output
> > files contain only 12 colours used in dither patterns. The result is the
> > same whether I use bmp() or png().
> What about bitmap()? Have you tried that?
> Internally bmp/png/jpeg use take a copy of the screen, so what you get
> depends on your graphics card driver. If you are seeing dithering in the
> PNG file, do you see it on screen? Is your screen set to a truecolour
> bitmap() works via ghostscript.
I can confirm that none of png, bmp, bitmap dither on my system for this
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 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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