Game Development Reference
Figure 6.71 The GPG.aep project.
fi rst place, you'd probably be better off going with the Levels
(Individual Controls) effect. Nevertheless, I think you should still
go through this section. It always helps to know as many ways to
color correct a layer as possible. This way, if your pet color correc-
tion effect doesn't work, you've got some alternatives.
If you'd like some practice with this effect, you can open up the
GPG.aep project from the Chapter 6 folder of the exercise fi les
(Fig. 6.71 ).
The Gamma/Pedestal/Gain effect actually works much like the
Curves effect does, except that you don't have any control over
the master luminance values, only over individual color chan-
nels. The Gamma/Pedestal/Gain (GPG) effect gives you a gamma,
pedestal, and gain control for each channel. The Gamma settings
would be like adjusting the center (midtones) of the luminance
curve in Curves (Fig. 6.72).
The Pedestal values control the darkest point of the channel,
which is the equivalent of the lower left corner point in Curves
(Fig. 6.73 ).
The Gain values control the highlights in the channel, which
is the equivalent of the upper right hand corner point in Curves
(Fig. 6.74 ).
The value at the top of the GPG effect in the Effect Controls
panel is Black Stretch. This property might well be called shadow
brightness or some such. Increasing the Black Stretch value will
increase lighting and details in shadow areas (Fig. 6.75).