Apple Shake 4 Tutorials Manual de usuario descargar pdf (Pagina 94)

94 Chapter 3 Depth Compositing

As shown in the illustration above, Shake orders these pixels and outputs the higher

values when it layers the images for the composite. Z channels are usually rendered

from 3D animation software, where each pixel has a known distance from the camera.

Note: You may need to make adjustments—inverting the grayscale image, for

example—to make the Z channel from your animation software work in a Shake

composite. This is because there are different methods for processing depth

information and your software may not match the method Shake uses to handle Z

channel data.

A Z channel can be rendered into the same file as the RGBA channels. You can also

generate and save a Z channel file—either with 3D animation software or a paint

program—and then use the Shake Reorder and Copy nodes to incorporate the Z

channel into an image. This latter method is useful when working with live-action

plates and other elements that do not have a rendered Z channel.

These images show the Z channels for the images in the first example of this tutorial:

The Z channel for balloons.iff was rendered from the original 3D scene file that created

that image, and is stored as one of the channels in the file. The Z channel for the city

background was hand-painted in an image editor. In this tutorial, you’ll incorporate this

separate image as the Z channel for the background.

city_/jointfilesconvert/1578512/bg.jpg include three channels: RGB.

The hand-painted city_/jointfilesconvert/1578512/bg_depth.jpg will be added

to city_/jointfilesconvert/1578512/bg.jpg as a Z channel.

balloons.iff includes five channels: RGBA (left) and Z (right).

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Apple Shake 4 Tutorials Manual de usuario Pagina 94