•   If you want white pixels in the channel to indicate selected pixels, choose Masked Area. •   If you choose Selected Area, the normal operation of the channel will be inverted, so that black pixels in the channel will select pixels when the channel is loaded. If you use this option, keep in mind that the channel will make selections that are the inverse of normal channel selections. 5 To change the mask tint color for the channel, select a color from the Color pop-up menu. Canvas displays the tint when an alpha channel and at least one other channel are visible. To change the opacity of the tint color, enter a value from 1 to 100% in the Opacity text box. 6 After entering the settings you want, click OK. Activating channels To edit a channel, click the channel name in the Channels palette to make it active. Canvas uses shading to indicate that a channel is active. Painting tools and filters affect active channels only. •   You can make more than one channel active by Shift-click- ing the names of the channels in the palette. •   To make a channel visible but not active, click the left col- umn to make an eye icon appear. •   You can make more than one channel visible by dragging in the left column in the Channels palette. To make all color channels in an image both visible and active, click the composite channel in the Channels palette. The composite chan- nel always appears first at the top of the Channels palette. Editing an alpha channel You can apply painting tools, filters, and effects to the image in an alpha channel. By editing the image, you can adjust what the channel will select when you load it as a selection.
Canvas 8 Help: Selections and channels (24 of 32)                                                   Page #674