MACROMEDIA FIREWORKS 8-USING FIREWORKS Use Manual page 110

3.
Drag the Amount slider to set the amount of noise.
Values range from 1 to 400. An increase in amount results in an image with more
randomly placed pixels.
4.
Select the Color check box to apply color noise. Leave the check box unchecked to apply
monochrome noise only.
5.
Click OK.
110 Chapter 4: Working with Bitmaps