[R] Remove "gray grid" from levelplot
ms at mcdev.com.au
Mon Mar 6 16:21:04 CET 2006
On 06/03/2006, at 10:40 PM, Prof Brian Ripley wrote:
> 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
> 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.
Sorry, sloppy and inaccurate description. The Mac Preview app
antialiases based on the translated fractional device coordinates when
viewing PDF/PS files.
I don't believe the png device does antialiasing directly.
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