I am a student and need to print power point slides for lecture using
power point 2007. I need for the text to be black on white and would
like to keep the pictures in color. I am looking for a quick and easy
way of reformatting powerpoint presentations that I did not create to
meet the color requirements above (color images with b/w text).

The problem is that the .ppt files are all created by different
people, each of whom think they know the most pretty way to display
their information. Often their choice is a black background with
colored text (not great for printing).

Ideally, I'd be able to just select all text in all slides at once and
change the text color to black, then change the background color to
white. But I can't do that, it seems to have to be done one slide at a
time and that takes too much time when there are 60 slides in a single
presentation.

Below are other things I have tried.

I can just print everything in gray scale, I know how to do that. But
it is unhelpful when some of the information in the pictures is lost
because they're not color.

I have tried playing with the 'design' tab, even crating my own design
templates, but invariably I get part of the presentation displayed as
white text on white background. I have also tried playing with the
master slides but that doesn't seem to affect all slides.