Topic       : TOS - The Operating System
Author      : 
Version     : tos.hyp (December 19, 2008)
Subject     : Programmieren/Atari
Nodes       : 3010
Index Size  : 93790
HCP-Version : 5
Compiled on : Atari
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View Ref-File7.2.12.5  Kerning                                                  TOS

Kerning is a process for manipulating spacing between characters to 
achieve a more consistent (better) appearance of the typeface. One can 
differentiate between two variants of kerning:

   . Track kerning: This method uses a constant offset for all 
     characters of a font. Fonts that support track kerning normally 
     include several offsets so that one can choose normal, tight or 
     very tight kerning, for instance.

   . Pair kerning: This is based on the realisation that one offset 
     makes little sense for all characters of a font, because in many 
     cases one can obtain an appreciably better appearance of the set 
     type if the spacing for each pair of characters can be set 
     individually. Fonts that support pair kernning therefore contain 
     a table in which the optimum offset for each combination of (more 
     exactly: for the most important) character pairs are noted.

Note: Both track as well as pair kerning are switched off after the 
opening of a workstation. So to achieve better text depiction one 
should switch on pair kerning with vst_kern.

See Also: vst_kern   vqt_pairkern   vqt_trackkern   vst_track_offset