Join Tim Grey for an in-depth discussion in this video Creating a channel-based mask, part of Photoshop: Creating Composites (2012).
You may already be familiar with the fact that a color image is comprised of …multiple channels that represent the individual colors, the primary colors. …In most cases those channels are red, green and blue for an RGB image and that …represents the amount of red, green or blue light that is included for each …individual pixel, determining the overall brightness and color values for each of …those pixels. But you can also use those channels as …the basis of a layer mask. Let's take a look at how it's done.…
I have an image here and I'd like to select the foreground so that I can …replace the sky, for example. So I'll go to the Channels panel and if …you don't have the Channels panel visible, you can go to the Window menu …and choose Channels. But then we can click on each thumbnail …in turn for the red channel, the green channel and the blue channel and what …we're looking for is the channel that has the best contrast for the area of the …photo that we want to select versus not select or to have visible versus not …
- Composite concepts
- Creating automatic composites
- Image compositing
- Refining layer masks
- Matching images
- Adding effects to composites
- Using layer groups
Skill Level Intermediate
Photoshop Masking and Compositing: Fundamentalswith Deke McClelland11h 36m Intermediate
Photoshop for Photographers: Compositingwith Chris Orwig4h 45m Intermediate
Photoshop CS5: Creative Compositingwith Chris Orwig4h 41m Intermediate
1. Composite Concepts
2. Automatic Composites
3. Image Compositing
4. Refining Layer Masks
5. Matching Images
6. Adding Effects to Composites
7. Using Layer Groups
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