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I try to maintain a page on font handling in OS X 10.6 Snow Leopard. There are a few changes in this OS that I don't quite understand. Maybe someone can shed a light on these?
According to Apple Snow Leopard is mainly an optimized, cleaned up version of OS X. Its goal is not to add tons of new features but rather improve what was already there.
With this in mind, it seems logical that Apple replaced a number of system fonts that previously were dfont files with regular Truetype (.ttf or .ttc) fonts. Getting rid of the 'non-standard' dfont format seems like a nice clean-up. But oddly Apple chose not to replace all dfont system fonts with regular TrueType equivalents. There are still a few dfont fonts in OS X 10.6. Why did they keep this clutter of TrueType formats?
'TrueType Collection' (.ttc) is a new type of TrueType font packaging, in which multiple variants of a font are stored in one single file. One could consider this clean, simple and a good way of limiting file clutter. Unfortunately Apple is inconsistent in its use of this .ttc file format. Why isn't it used for all the TrueType font families that ship with OS X 10.6? Why use this technique for some families but not for others?