Channel mask 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. Viewing previews in the Channels palette 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. Channels palette options Use the Channels palette to work with channels when a paint object is in edit mode. Active channels are shaded. Editing affects the active chan- nels only. To make a channel active, click the channel name. A    Composite channel. Select this channel to make all color channels visible and active. B    Color channels. Color channels appear below com- posite channels. C    Alpha channels. Alpha channels contain grayscale pix- els which represent a selection. D    Channel mask. A special channel you can add to any ob- ject, a channel mask contains grayscale pixels that represent transparency. E    An eye indicates that a channel is visible. If a channel is not visible, click or drag in the column to make it vis- ible. F Click to make a new alpha channel with de- fault settings. Drag an al- pha channel here to du- plicate it. G   Click to save the cur- rent selection in an alpha channel. Drag a channel here to make a selection in the image from the channel. Floating Opacity. If a selection is floating, drag the slider to change the opacity of the selection. Mode. If a selection is floating, select a mode from the menu. The default mode is Normal. H    Drag channels to the trash to delete them. You cannot de- lete color channels. Preserve Visibility. Select this option to preserve the transpar- ency of clear and partially trans- parent pixels when you edit an image. C A B E D F G H
Canvas 8 Help: Selections and channels (21 of 32)                                                   Page #671