I have a PDF that has black font and the default white background (or no color). The glare from the monitor hurst my eye after long time reading it, even though I lower the brightness of the computer.
How can I convert black to white and white to black in a PDF? White font from a dark background is must more comfortable for the eye to read. Perhaps ImageMagic?
[EDITED]
OS: Mac OS X Leopard
Reader: build-in Preview