2017

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4 Draw a garbage mask around the subject and close it by clicking the first vertex drawn. Use as many
vertices as required to adequately enclose the subject, but try to avoid excessive vertices. This will
minimize unnecessary tweaking and manipulation later.
TIP Place more vertices in areas with variation in the background.
To assign pickers to selected vertices:
1 From the Edge Softness box, select Tracer.
The Tracer menu appears, and two softness borders (the green lines) are added to the mask.
(a) Edge Softness box
2 Select the vertices to which you want to apply pickers. See
Selecting Vertices and Tangents (page 752).
3 Enable Pickers.
NOTE When one or more pickers are enabled, mask characteristics are automatically set to Outside disabled
and a Colour value of 0 so that the mask will be white inside and black outside. Do not set the Outside
button unless you want to reverse the effect.
A pair of pickers is provided for each selected vertex.
(a) Softness borders (b) Picker
On vertices without pickers, the softness borders delineate the area where a softness gradient is
applied.
On vertices with pickers, the softness borders delineate the area to which softness is applied according
to the picker values.
770 | Chapter 18 Masking and Rotoscoping