In today’s video installment from Deke’s Photoshop CS4 Channels & Masks One-on-One, Deke discusses the quick mask mode, and how, really it’s not exactly the masking that happens quickly. The quick mask mode is actually so named because it allows quick switching between your mask and its equivalent selection. As Deke notes:

So if you think of the grand topic of masking as being a swimming pool, and the channels palette is the deep end, then the quick mask mode is the shallow end. But you’re still very much in the water.

Nonetheless, you’ve still got the Jaques Cousteau (or Michael Phelps?) of Photoshop to guide you through the waters. Enjoy!