Editing the Filter

Filters are equations which have variables. Each equation can have up to three variables labeled a, b, and c. The values for each variable are displayed at the bottom of the palette.

Generally, a controls the intensity of the filter effect while b controls the overall height. In some filters a and b may stand for other things. For those filters that use it (Quantize and Snow Puddles), c controls the number of steps between values or the height required for snow to appear.

There are two ways you can adjust a filter: by changing the variable values or by changing the shape of the graph (which automatically changes the variable values). The method you use depends on how much you know about a particular filter. If you're not sure what the filter does, change the graph - it's a much more intuitive way of working.

To edit the Filtering graph:

1. Display the Filtering palette and select which component to adjust by clicking in one of the indentations.
   
   
   
   If the current filter is set to None, left-click hold on the filter name and select a filter from the list.
2. Left-click hold over the Filtering graph area. The cursor changes to a four sided arrow. Drag over the filter and the shape of the graph changes as you drag.
   
   
   
   Notice that the variables also change as you move the graph.

• Dragging horizontally changes the value of a.
• Dragging vertically changes the value of b.
  
  

To change variable values:

1. Display the Filtering palette.
2. Left-click hold over the variable field you want to change. The cursor changes to a double-ended arrow. Drag left to reduce the value or right to increase it. The shape of the graph changes as you adjust the values.
   
   
   
   Please note that if the filter equation does not include the c value, then adjusting that value will not affect that particular filter.

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