Making channel-by-channel adjustments

In this movie I'll show you how you can change the color balance of an image by…applying levels on a channel-by-channel basis. So, many of you will recognize this…badly balanced version of my children here from Chapter 8.…I'm going to drop down to the Black/White icon, click on it, and choose the Levels command.…And notice that in addition to correcting the composite image, meaning all…channels at the same time, you can correct each one of the channels…independently, and we have keyboard shortcuts to switch between them as well, of…Alt+2 through Alt+5 here in the PC-- that's Option+2 through Option+5 on the Mac.…

So for example, if I thought there was too much red in this image I could…switch to the Red channel, and I can go ahead and drag that Gamma triangle to…the right, then if I feel like I've got too much green, then I could switch to…the Green channel and drag its gray triangle as well.…The thing is that's kind of a pain in the neck you have to switch between…channels and just make guesses about what it is you're supposed to do, which is…