In this screencast I give some practical application to this whole concept of selections and masking using Alpha Channels in Photoshop. We look at 2 different images and 2 different approaches of creating a mask to knock out an object from the background.
Direct download: Quicktime M4V Format
[flv:http://www.garydatesphotos.com/screencasts/alpha-2.flv 540 405]
Tags: intermediate, tutorial