[Rd] using rasterImage within image

[Ben Bolker]

  Has anyone yet tried incorporating rasterImage into the base image()
function?  It seems to make a *huge* difference, with
a very small number of added/changed lines of code.  (Of course I have
barely tested it at all.)
  Is there any reason this *shouldn't* go into the next release?

> source("image.R")
> z <- matrix(runif(1e6),nrow=1000)
> image(z)
> image(z,useRaster=TRUE)

  (Patch against SVN 54284 attached; people can contact me if it doesn't
go through and they want it.)

  Ben Bolker

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