User Guide

FontLab 4
490
Additional Control Data
Some additional data may be set to control the hinting process:
BlueScale
Controls PPM when overshoot suppression is switched off
BlueShift
Gives more precise control over overshoot description (see below)
BlueFuzz
Expands alignment zones in both directions
You c an se t all the s e va l ue s on th e Additional Hinting P aram eters pa ge
of th e Font Info dia log box :
Blu eScale is the PPM size at wh ich overshoot suppression is s witche d off. If
PPM is le ss tha n Blue Scale, then oversh oot su ppress ion is applied. If it is equal
to or exc eeds B lueSca le, overshoot suppression work s only if th e distance from
the aligned point to the ba se line of the alignment zone is les s than the
Blu eShift val ue and the s caled distance is less than ha lf of a pixe l.