More on pixel aspect ratios + color sampler expression

Todd Kopriva reviews resources in pixel aspect ratios in After Effects CS4 and other applications in Creative Suite 4 Production Premium, including the previously mentioned PAR for the Course: Working with the new pixel aspect ratios in CS4 by Chris Meyer.

See also AEP's Customizing pixel aspect ratios in AE CS4 for 3 undocumented and unsupported workarounds of CS4 PAR settings.

Note: Todd also posted, color sampler using sampleImage expression method to help you "get a readout of color values for one or more points that would update as you tweaked color correction settings."