Channels & Masks Lesson 10: Using Calculations in Photoshop
It's Friday, but seriously, deeple, get your entertainment and education at the same time as you enjoy this video which I pilfered for your enjoyment from the companion DVD of Deke's Photoshop CS4 Channels & Masks One-on-One book.
In this lesson, Deke introduces you to the Calculations command which can be a little tricky, but oh-so-very useful and important to understand. As Deke notes:
Now I won’t sugarcoat it, Calculations is not easy—in fact, it might be Photoshop’s single most difficult feature to master. But it is the command that’s going to increase the quality of your masks.
When you're done, you can return to your less edifying Friday festivities. Happy Weekending, Deeps.