2011

Table Of Contents
To:Use:
Crop the output imagesee Crop Tool on page 410.Crop
Simulating Camera Jitter Using the 2D Transform Tool
NOTE The following example describes one way to simulate camera jitter using
the 2D Transform tool combined with a Noise or Rand expressionsee
Random
Number Functions
on page 749.
To simulate camera jitter using the 2D Transform tool:
1 Place a Transform 2D tool at the desired point in the dependency graph
(if one is not already there).
2 Select the 2D Transform tool.
3 Right-click in the X (or Y) value editor and select Set Expression. The
Expresso calculator appears.
4 Select Random, then Noise, and type the following expression:
noise(t*50)*15. This expression can be broken down as follows:
Returns:Where:
A value between -1 and 1.noise (t)
A value between -1 and 1 and where 50" represents frequency. The
larger the value, the longer the frequency of the resulting noise.
noise (t * 50)
Values between -100 and 100, where 100 represents amplitude.noise (t * 50) *
100
434 | Chapter 17 Image Processing Tools