Apple Shake 4 - Manual (Page 873)

Chapter 28 Filters 873
4 Ensure that the FilmGrain parameters are still active.
5 In the Viewer, drag to create boxes in the areas you want to sample.
Note: The sampled areas should be very flat without detail that may disrupt the grain
analysis. Small elements are perceived as grain detail, so the best sample areas are
featureless walls, exposure cards, and so on.
You can sample as many areas as you want.
6 To undo a sample, do one of the following:
• To undo a box drawing, click the Undo Last Region button in the Viewer shelf.
• To remove all boxes and start over, click the Reset the Regions button in the Viewer
shelf.
7 Once the boxes are set, click the Analyze Grain button in the Viewer shelf.
The parameters in the FilmGrain node are set to match the plate.
Parameters
This node displays the following controls in the Parameters tab:
intensity
The intensity of the grain. Values are between 0 and 2.
grainSize
Size of the grain, between 0 and 2.
aspectRatio
This parameter inherits the current value of the defaultAspect global parameter. If
you’re working on a nonsquare pixel or anamorphic image, it is important that this
value is set correctly to avoid unwanted distortion in the image.
seed
The random generation seed. Set this to a constant value to freeze the grain. By default,
this is set to the time expression. When Shake generates a random pattern of values,
you need to make sure for purposes of compositing that you can recreate the same
random pattern a second time. In other words, you want to be able to create different
random patterns, evaluating each one until you find the one that works best, but then
you don’t want that particular random pattern to change again.