All Durotype fonts are UltraPrecision™ fonts.
UltraPrecision fonts are 11.11 times more precise than PostScript (Type 1) fonts and most PostScript flavored OpenType fonts.
UltraPrecision fonts are 2.65 times more precise than most TrueType fonts and most TrueType flavored OpenType fonts.
UltraPrecision is a technology innovation which has been introduced by Durotype.
Note UltraPrecision fonts have an UPM grid of 3333 by 3333 units. The UPM (Units Per eM) is the number of units that defines the coordinate grid on which the characters of a font are drawn. The bigger the UPM grid is, the more coordinate space there is, and the more precise the characters can be drawn. PostScript (Type 1) fonts have an UPM grid of 1000 by 1000 units. PostScript flavored OpenType fonts usually have the same UPM grid of 1000 by 1000 units (= 1,000,000 grid points). TrueType fonts and TrueType flavored OpenType fonts usually have an UPM grid of 2048 by 2048 units (= 4,194,304 grid points). UltraPrecision fonts have an UPM grid of 3333 by 3333 units (= 11,108,889 grid points). The extra precision which is offered by UltraPrecision fonts, is based on these differences in UPM units.
Historical Note The PostScript Type 1
and TrueType font technologies are around for quite some time now. PostScript Type 1
has been introduced in the
mid-1980’s, and TrueType has been introduced in the beginning of the 1990’s. With the introduction
of OpenType in 1996, a font specification arrived which uses either PostScript or TrueType
outlines inside a ‘wrapper’. Although the OpenType specification adds a lot to those two
original font specifications, it still does include the outline specification of those two
older font formats.