Datasheet

Displacement Mapping 23
Figure 1.52 The two images as seen in Bridge
You can duplicate the blue channel by clicking and
dragging it to the Create New Channel icon at the bottom
of the Channels panel (second from the right, next to the
Trash). A quick Contrast adjustment will help separate the
whites and blacks further. I’ve chosen +25.
Next apply a Gaussian blur to the map channel so
that, when it is used to distort the second image, there are
no sharp changes and the alterations appear smoother and
more transitional (see Figure 1.53).
The last link in the creation of the displacement map is
to save it as a new
.psd le. To do this, right-click the chan-
nel and select Duplicate Channel. In the dialog box that
appears, name the new image and be sure to set the
Destination setting to New (see Figure 1.54). When the file
opens as a new image in Photoshop, choose File
Save As and save the new .psd le to
your hard disk. Remember where you placed it, because you will need it again shortly.
When you have saved the new map, you can close it in Photoshop. Return to the
Back.jpg
photo and delete the extra channel, as it is no longer needed.
Figure 1.54 Save the new displacement map
as a new document on your hard drive.
Figure 1.53 A blur helps
conform the image to the map.
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