Apple Shake 4 - Manual (Page 875)

Chapter 28 Filters 875
filmResponse
Determines the extent to which the grain inherits its color from the input image
instead of simply black and white. Progressively higher positive values result in the
grain matching the color of the input image more closely. Progressively higher negative
values result in the color of the grain becoming somewhat muted. This parameter
defaults to 0. The rFilmResponse, gFilmResponse, and bFilmResponse subparameters let
you customize the filmResponse of each individual color channel.
colorCorr
This parameter specifies the apparent saturation of the grain in units that represent the
color-correlation value measured by statistical analysis of a particular film sample.
The value represents how closely the grain patterns in each channel overlap. This
means that negative color-correlation values decrease the amount of overlap, which
increases the apparent saturation of the grain, while positive values decrease the
apparent saturation.
Grain
The Grain node adds grain to an image. It is used to simulate film grain for 3D-rendered
elements. The Grain node is not as accurate as the newer FilmGrain node.
This node gives you complete per-channel control over grain size, density, softness, and
so on. The controls are explained below, with visual examples after the parameter list.
Note: If you have an RGB channel image, there is no grain if obeyAlpha is enabled, as
there is an alpha value of 0.
In general, when there is a parameter followed by the same parameter on a per-
channel basis, the first one acts as a multiplier on the channel parameters. For example,
a density of .5 multiplies rDensity, gDensity, and bDensity by 0.5.
Parameters
This node displays the following controls in the Parameters tab:
size
The overall size of the grain. “size” is a multiplier on the rSize, gSize, and bSize
subparameters. You can have sizes less than 1.
density
The density of the grain. 1 is maximum density. “density” is a multiplier on rDensity,
gDensity, and bDensity.