Adobe AFTER EFFECTS CS3 PROFESSIONAL User Manual page 460

Noise samples for the Match Grain and Remove Grain effects are always extracted from the source layer without
regarding any effects or masks already applied to the layer; this method results in more accurate sampling. If you
want the samples to include the existing effects, you must precompose or prerender the source layer with the effects
and then apply the grain effect to the resulting source layer.
Avoid sample areas with the following characteristics: sharp edges, color gradients, highlights, textures such as grass
or water ripples, fine detail such as hair or tree leaves, and overexposed or underexposed areas lacking in infor-
mation.
In the Effect Controls panel, choose Noise Samples from the Viewing Mode menu.
1
The samples appear as small white squares (24 x 24 pixels) overlaid on the source image.
Choose Manual from the Sample Selection pop-up menu in the Sampling controls group.
2
To remove the least desirable samples from the image, try reducing the Number Of Samples value.
3
4 To move a noise sample, do one of the following:
• Click the point parameter
appears in the composition, centered on that sample. Click the desired location in the Composition panel to place
the sample.
• Using the Selection tool
• Enter the desired horizontal and vertical coordinates in the Effect Controls panel.
Note: The number of sample points that are enabled corresponds to the current value of the Number Of Samples.
Repeat for each sample point you want to move.
5
Change the sampling source frame
By default, the Remove Grain and Match Grain effects take noise samples from the first frame of the sequence, but
you can choose to sample the noise from a different frame. Changing the frame might be useful if large lighting or
exposure variations occur between frames within the sequence.
Decide which frame you want to sample; make sure that the project settings Display Style is set to Frames,
1
numbering from zero. The number of the current frame then appears in blue in the top left corner of the Timeline
panel. Enter that frame number as the Source Frame value in the Sampling controls group.
Choose Noise Samples from the Viewing Mode menu.
2
The selected frame appears in the Composition panel, and its automatic samples appear on the image.
Change the noise sample box color
You can set the Remove Grain or Match Grain effect's viewing mode to Noise Samples to see the areas sampled by
the effect. Sampled areas are automatically framed with a white outline. If you prefer, you can change the color of
these noise sample boxes.
❖
Next to the Sample Box Color control in the Sampling controls group, do one of the following:
• Click the color swatch, and select a color in the Color Picker.
• Click the eyedropper, and click a color anywhere in the application window.
for the noise sample in the Noise Sample Points controls group. A cross hair
, drag the sample point in the Composition panel to the desired location.
AFTER EFFECTS CS3 454
User Guide