Channels Photo shown with channel window displaying the color channels that make up the image. Left column shows default color channel. Right column shows the same channels with preferences set to show channels in color.
Alpha one is a channel containing the selection of the child's outline.
This selection will be available at a later time. Sample showing the main image view when only the Red channel is selected. The selection will remain and affect all channels when the RGB channel is activated. Used with permission. I spoke in the first part of this tutorial about the mystique surrounding masks in the computer graphics world, but the fear and lack of understanding about channels seems to be greater than with masks.