Invert color of pdf

Hello,
I am not sure whether I am in the correct forum.
Nevertheless, I have a pdf (created by keynote + Latex) with light objects on dark background and before print I would like to invert all colors (in order to save on the ink). Can I do so with ColorSync and how ? Or is there another way to achieve the same goal (should work in an automatted way) ? I found out that Illustrator can do that, but only page by page which is very cumbersome for a large document.
JoJo

ok, so I've got
as my base template;
ColorTransform([redMultiplier:Number],
[greenMultiplier:Number], [blueMultiplier:Number],
[alphaMultiplier:Number], [redOffset:Number], [greenOffset:Number],
[blueOffset:Number], [alphaOffset:Number])
then I stick that in some kind of variable, like
var mc_invert = ColorTransform(...);
invertColor = ColorTransform(test_mc);
invertColor.ColorTransform(mc_invert);
... I don't think I'm parsing this right, and I haven't got a
clue what goes in "redMultiplier:Number" or "redOffset:Number"
I'm going to guess
ColorTransform([redMultiplier:-1, [greenMultiplier:-1],
[blueMultiplier:-1], [redOffset:255], [greenOffset:255],
[blueOffset:Number])

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Message was edited by: JoeTheCoder

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