R-beta: first view, then save plot or image?

[Bill Simpson]

I know how to first set postscript output, then execute plot or image
command to create a postscript file of a plot or image.

I was wondering if it is possible to first create the plot or image on
screen so it can be viewed, THEN save it to file?  Without doing plot() or
image() again?

(I ask because I have a complicated image computation that takes about 1-2
hrs to complete.  I would like to view, then save it to file if I like it)

Along a similar vein, is it possible to alter an image after it has been
plotted on screen?  That is, first create image, then decide I want a
different palette of colours, then alter it.  Again, is it possible to do
without re-executing image()? (In my case, without waiting another 1-2hrs)

Thanks very much for any help!

Bill Simpson

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