Adobe 65008009 - After Effects CS4 Technical Paper page 18

• For output for display in web browsers and other web-based environments, use the
default profile in the Output Profile menu (Working Space - sRGB IEC61966-2.1).
Since the output profile is the same as the profile used as the working space, no color
conversion will take place when compositions are rendered and output.
Color management workflow in Adobe After Effects CS4 18