Michael Na Li <[EMAIL PROTECTED]> writes:
[...]
> 1. Turn off background (and foreground colors) inside the figure region?

create a box with white background, like

        \colorbox{white} 

hosting the graphics.

> 2. An easy way of switch back and forth between "fancy background" to "plain
>    background" so I can use normal black on white pages for the figure?
Depends on how you do the background.
You can switch background gradients 
any time before a page starts if you just use 
a new 

        \vpagecolor[#1]{#2}

Yours,
Steffen

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