How do you ADD color banding to video (using Adobe Creative Suite)?
Adding colour banding is also known as posterising (or posterizing if that's how you roll). There's a built-in (to AE, though I'd be surprised if it's not also in PP) posterize effect (Effects&gt;Stylize&gt;Posterize). It only has one control, Level, if you set it low you'll get something that looks like an 8-bit game, or a screen-printed poster (hence the name):

Or if you set it higher you get banding:

If you want a bit more control the Cartoon effect (Effects&gt;Stylize&gt;Cartoon) also give you pronounced banding. Set the render style to Fill (default is Fill &amp; Edges), and then twiddle the knobs.