On Mon, 6 Mar 2006, Martin Sandiford wrote: [...]
> P.S. To me, the png() device does not appear to do sub-pixel > rendering. The postscript() and pdf() devices do. What could you possibly mean by that? The postscript() and pdf() produce vector graphics and have no concept of a pixel. There are filled polygons as part of the language they output. (Of course the coordinates are output to finite resolution, in fact 0.01dp = 1/7200", so you could think of that as the positioning quantum.) The png device writes on a bitmap. It outputs a rectangular grid of either pre-defined colour indices or RGB values. There is nothing in the PNG standard to allow anything finer. -- Brian D. Ripley, [EMAIL PROTECTED] 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 ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
