You can see the individual color channels in Photoshop by enabling and disabling the channels in the Channels pane. You can even enable two channels at a time and see how they combine with each other to produce the full palette you see in your photos. If you want to get more hands-on, you can also capture individual color channel photos, using your camera, a tripod, and some colored filters.
put together the process (admittedly, as a means of promoting its series of handheld camera and flash filters). Let's run through the steps.