The Channels palette displays the channels contained in a paint object when the paint object is in Edit mode. The palette also displays the channels contained in any object that has a channel mask when you edit the mask.
You can use the palette to create, duplicate, and delete channels; to change channel options; and to make selections by loading channels.
A special channel you can add to any object, a channel mask contains grayscale pixels that represent transparency. Drag a color or alpha channel to the channel mask slot to create a channel mask. You can drag a channel mask into the channel list to create a new alpha channel.
To view previews in the Channels palette, choose Palette Options in the palette’s pop-up menu. Click the size of the preview you want to display, or click None. Click OK to close the dialog box.
Use the Channels palette to work with channels when a paint object is in Edit mode.
Active channels are shaded. Editing affects the active channels only. To make a channel active, click the channel name.
Select this channel to make all color channels visible and active.
Color channels appear below composite channels.
Alpha channels contain grayscale pixels which represent a selection.
A special channel you can add to any object, a channel mask contains grayscale pixels that represent transparency.
If a selection is floating, drag the slider to change the opacity of the selection.
If a selection is floating, select a mode from the menu. The default mode is Normal.
Select this option to preserve the transparency of clear and partially transparent pixels when you edit an image.
An eye indicates that a channel is visible. If a channel is not visible, click or drag in the column to make it visible.
Click to make a new alpha channel with default settings. Drag an alpha channel here to duplicate it.
Click to save the current selection in an alpha channel. Drag a channel here to make a selection in the image from the channel.
Drag channels to the trash to delete them. You cannot delete color channels.
The following commands appear in the Channel palette’s menu.
Shift-drag a channel to the Save button.
Option-drag a channel to the button.
Press Command+Shift and drag a channel to the button.
Although Canvas X Draw can store up to 24 channels in an image, you might want to delete unnecessary ones to save memory and disk space. You can delete alpha channels and channel masks, but you cannot delete color channels.
With an object in Image Edit mode, drag the alpha channel you want to delete to the trash can icon at the bottom of the Channels palette.
You can identify whether you are in Image edit mode by the Status bar.