Mask Set Threshold
If a selection edge is feathered, this value
defines the edge of the selection for tracing based on selection mask
opacity. Enter a value from 1 (nearly transparent) to 255 (opaque).
These values correspond to the lightness of pixels for a selection
saved as a mask in a channel.
Pixels in the selection mask that are more opaque (lighter) than the
threshold value are treated as opaque and part of the selection. Pixels
that are less opaque (darker) than the threshold value are treated as
transparent and outside the selection. At a threshold of 1, the entire
feathered edge will be part of the selection. At 255, only the com-
pletely opaque part of the selection will be included.
If a selection is not feathered, this value has no effect.
Curves / Polygons
Choose Curves to create paths with smooth
anchor points and curve segments as appropriate. Choose Polygons
to create paths with straight segments only. The Curves option can
result in smoother paths with fewer anchor points when the selection
border has curves.
Loose /Tight
Drag the slider to set the tolerance for tracing irregu-
larities in the selection border. Loose follows the selection border less
precisely (more smoothly) and creates fewer anchor points. Tight fol-
lows the selection border more precisely (less smoothly) and creates
more anchor points.
Round /Sharp
Drag the slider to set the tolerance for tracing cor-
ners in the selection border. Round creates rounder corners, Sharp
creates sharper corners.