inverting colors in MacOsX

  • during a presentation, a figure may reveal more readable if you invert colors and luminance: black gets white and reverse, red becomes cyan and so on.

  • this can be done on the fly using the magical ctrl + opt + command + 8 keyboard shortcut (on a french keyboard, press ! instead of 8).

  • a property linked to universal access (see that reference pane for other tricks)