Graphics options defaults

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* How to I get ROOT to plot black lines on a white background
by default?
I currently have a histogram plotted and I was able to change
the canvas background to white by hand, but the
TFrame->SetFillAttributes menu option seems to defy my desire
to make its background white.

* How can I specify the dimensions of the plot in the Postscript file
which is saved? e.g. I want portrait with 1" margins rather
than the default of landscape with ~1 cm margins.

* I'd like to be able to set all my defaults once and then not have
to worry about them again. Where/how should I do that?

Thanks for the help.

Stephen

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