button on the Brush Variance palette to remove any variance
settings. Use the Brush Variance palette to customize the raster brush settings in the Tool Options palette. The variance settings modify the Tool Option settings by applying adjustments to the settings for a particular tool option. Adjustments can be random by increasing the Jitter percentage.
Note: If you have a variance
loaded with a raster brush, then load another brush without loading its
variance, it can take on the variance settings from the previous brush.
Click the Reset button on the Brush Variance palette to remove any variance
settings.
To open the Brush Variance palette:
Choose View > Palettes > Brush Variance, or press F11.
To use the Brush Variance palette:
Choose a raster brush type from the Tools toolbar.
Configure the raster brush options in the Tool Options palette.
On the Brush Variance palette, set brush variance for each option (Color blend, Hue, Saturation, Lightness, Size, Opacity, Thickness, Rotation, Density):
Normal No variance applied.
Pressure The pressure applied from a tablet stylus.
Altitude The angle between the stylus and tablet.
Azimuth Determines the rotation angle of the tip.
Twist The rotation angle around the stylus (for 4D mouse only).
Fingerwheel Applies to the wheel on an airbrush stylus.
Z-Wheel Used with a 4D mouse wheel with the wheel configuration set to application defined behavior.
Direction The angle between consecutive mouse points on a path.
Fade In Fades the brush impression from small to large.
Repeating Fade In Repeatedly fades the brush impression from small to large.
Fade Out Fades the brush impression from large to small.
Oscillating Fade Repeatedly fades the brush impression in and out from small to large to small.
Note: Options in the Variance palette marked with an asterisk * apply only to users with a pressure sensitive tablet. The options available will depend on the type of tablet being used.
For the Fade rate (pixels) select the number of pixels over which the fade in and fade out will occur. Lower values produce a faster fade, while higher values produce a slower fade.
For the Position Jitter (%) select a percentage for randomly adjusting the brush impression location. Mark the Scale check box if you want the jitter to scale with the brush size.
For Impressions per step, indicate how many brush impressions are made per step of the brush stroke.
Note: To reset
brush variance options to their default values, click the Reset
to Default button 
on the Brush Variance palette.
Painting with the Paint Brush or Airbrush
Setting Brush and Paint Options