Graphics Programs Reference
In-Depth Information
7.
Save your work so far.
Working with channels
Just as different information in an image is stored on different layers, channels also
let you access specific kinds of information. Alpha channels store selections as
grayscale images. Color information channels store information about each color
in an image; for example, an RGB image automatically has red, green, blue, and
composite channels.
To avoid confusing channels and layers, think of channels as containing an im-
age's color and selection information; think of layers as containing painting and
effects.
You'll use an alpha channel to create a shadow for the model. Then, you'll convert
the image to CMYK mode and use the Black channel to add color highlights to the
hair.
Using an alpha channel to create a shadow
You've already created a mask of the model. To create a shadow, you want to es-
sentially duplicate that mask and then shift it. You'll use an alpha channel to make
that possible.
1.
In the Layers panel, Ctrl-click (Windows) or Command-click (Mac OS)
the layer icon in the Model layer. The masked area is selected.
2.
Choose Select > Save Selection. In the Save Selection dialog box, make
sure New is chosen in the Channel menu. Then name the channel
Model
Outline,
and click OK.
