DTL FontMaster Manual1.1 PDF

dtl contourmaster: options
3.15 Double points control/anchor
This function checks whether there are control points very close to anchor
points. This can be a design feature, but it can also indicate a digitization
error. Especially if the control point is located on the wrong side of the
anchor point the curve can be very problematic for further conversions.
If the point is within the tolerance, it will be shifted to the position of
the anchor point.
3.16 Extreme points (adjust)
This function checks again whether an extreme point on a Bezier curve
section is missing. In contrast to the other function, it does not add an
extreme point but tries to modify the position of the control point in order
to make the anchor point an extreme point.
If the deviation of the control point position from the horizontal or
vertical is less than the specified tolerance, then the control point will be
moved to that position.
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The arrow indicates a problematic
control point position.
The control point is not horizontal.
If it deviates less than the tolerance,
then it will be aligned horizontally.