Apple Shake 4 - Manual (Page 852)

852 Chapter 27 Warping and Morphing Images
Note: In addition to viewing the actual warp effect, you can view the position of the
displacement targets, as defined by the overallDisplacement and
connectionDisplacement parameters, by turning on the Displaced Target Shape
Visibility button in the Viewer shelf. These indicators are designed to help you see what
the deformation will be without having to render the entire image. Displaced target
shapes are pink by default.
This example displays a characteristic of the warper—it works as if the image is made
of a sheet of rubber and you’re actually pushing the pixels of the image around,
stretching the surrounding image. In the above image, the pixels of the eyebrow are
moved up because they lie directly on the path of the source shape. You’ll also notice
that the right edge of the eyebrow appears to stretch back to the original position of
the eyebrow. This is because the pixels surrounding the eyebrow are stretching to fill in
the areas of the image where the eyebrow used to be. If the effect is not what you
want, modify the source shape to redefine the area of the image being manipulated.
You’ll notice that, in addition to the eye and eyebrow being warped, a significant area
of the face surrounding the source/target shape pair is also affected, and the top of the
head is pushed upward. To limit the warping effect to the region immediately
surrounding the eyes and eyebrows, create one or more boundary shapes.
9 First, choose Source Image from the Select Display Image pop-up menu in the Viewer
shelf. This allows you to draw your boundary shapes to match features in the original
image.
10 Next, draw more shapes identifying the areas of the source image you want to lock
down.
Pink displaced target shapes indicate the value of the displacement parameters.