2011

(a) Input image of CG character on which grain will be applied. (b) Panner tool to place
the CG character at the desired location in the reference image. (c) Add Grain tool
(d) Comp Ops tool to composite the CG character over the background(A over B).
(e) Reference image from which the grain is sampled.
Once the dependency graph is built, you can decide which area of the reference
image to sample. You can select samples from multiple areas of the image.
You should use an area of the image that just contains grain, avoiding areas
with image or edge detail. Once you have positioned the sample area, you can
apply grain to the input image. After adding grain to the input image, you
can manually adjust the response curves for the gain and size of the grain.
To add grain to a composition:
1 From the Tools tab, drag the Add Grain tool from the Grain Management
folder to the dependency graph in the Schematic view.
2 Connect a reference image and an input image to the Add Grain tool.
3 (Optional) Add a mask to your input image to restrict the grain to a
portion of the image—see
Creating Masks on page 540.
4 In the Add Grain tab, do one of the following:
■ Click the Analyze button.
Regions of the reference image that are appropriate for analysis are
analyzed and grain is applied over the entire composition.
■ Click the Selection button and drag to define an area to analyze. For
best results, define multiple regions of uniform color, avoiding areas
that may resemble grain such as gravel, sand, or a forest. Click the
Analyze button to create the grain. Click Clear to clear any areas you
defined and start again.
Adding Grain to a Composition | 503