Figure 8.18

The Normal channel ill

9. Rename the Alpha 2 channel Normal. Hereafter you'll be able to select this channel by pressing Ctrl+6 without having to select the Channels palette.

10. Open the file Zdepth.png from your hard drive (see Figure 8.19). This image represents 3D space in grayscale, with objects in the foreground fading from white to black as they recede from the picture plane. You will use this channel later in this chapter to create a fog or a shadow that accentuates the spatial quality of the illustration.

NOTE The Z in Zdepth refers not to the spatial world Z axis (which is up), but to the axis that runs along the camera-target vector, away from the picture plane.

11. Press Ctrl+A and then Ctrl+C to copy all the Zdepth pixels to the Clipboard. Close Zdepth.png.

12. Select Farmhouse.psd, click the Create A New Channel button at the bottom of the Channels palette, and then press Ctrl+V to paste the pixels from the Clipboard onto the new channel.

Figure 8.19

The Zdepth channel

Figure 8.19

The Zdepth channel

13. Rename the Alpha 2 channel Zdepth. Hereafter you'll be able to select this channel by pressing Ctrl+7 without having to select the Channels palette.

14. Press Ctrl+D to deselect. Then press Ctrl+— to select the RGB channels (see Figure 8.20).

15. Click the Layers palette. Note that no new layers have been created while you have been adding data to the Channels palette. Press Ctrl+S to save your work. If you're going to continue working through the following sections, you can leave this file open for now.

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