We almost always choose our fonts based on some aesthetic level, whether that be readability, a particular style which works with a design problem or both. When installing and using typefaces you will often come across different formats, even if you only mark this difference in the changes of suffix for the files (.ttf. otf .suit. bitmap). A question I have been asked recently is should these formats play a part in the selection process of a typeface?
My initial answer was no. I feel that the latest Windows and Macintosh operating systems have evolved to a level where most fonts can be used cross-platform and therefore makes what used to be a sticky issue almost a non-issue… At least for the most part.
The main formats do have differences however, and it is worthwhile understanding them as it can sometimes be an additional factor to a particular typeface or font choice. The subject can get quite technical, but here I will try to keep it broad and so will not be all-encompassing. I recommend further reading on the subject if you feel something has not been covered.

PostScript Type 1 & Type 3
These format were developed by Adobe, beginning with Type 1, and is considered by some as still the most reliable format for high resolution, precise printing. It is built using the same technology as PDF documents and almost all printers have the PostScript language installed. A Type 1 or Type 3 font can consist of multiple files which hold discreet information that together create the complete font. Screen render information for glyphs in one file and printer bitmap information in another is an example. This format requires separate versions for Macintosh and Windows systems.
TrueType
This format was created by Apple and is supported across both Macintosh and Windows without the need for any conversion. Complete fonts are contained within a single file which eliminates a lot of the heartache associated with large, unsorted font libraries on your computer. From a technical point of view TrueType fonts were programmed differently to PostScript which allows much more information to be held including more glyphs in the typefaces.
TrueType fonts can now be printed as reliably as PostScript fonts to almost all devices including high-end printers.
OpenType
This format is the newest of the bunch which was developed by Adobe and Microsoft and is by far the most technically advanced format. Is is based on the earlier TrueType format meaning it is also cross-platform compatible.
OpenType fonts have advanced typographic control, special layout features, and a much larger glyph capacity. 65,355 to be exact compared with the 256 in PostScript Type 1.
OpenType uses Unicode which is a character encoding system that covers most of the world’s languages. The combination of the extensive glyph capacity and a Unicode base means the OpenType format can hold multiple languages including mathematical symbols, ligatures, punctuation, oldstyle figures, ornaments and much, much more in one font file.
You can have many fonts in any of these formats installed, but a general rule-of-thumb is to avoid having the same typeface installed in different formats at once. This is where problems can arise.
In conclusion, a more considered answer to the original question would be that it depends on what you are using the typeface for. If it’s for a smaller piece that has little or limited longevity, the format is much less of a consideration.
However, for larger ongoing projects, where you can’t foresee all applications of the standards you are creating, a more robust font with a number of family variations is always a good choice. Naturally, if a font like this is available in the newer OpenType format, your work will be platform independent, potentially multi-lingual and with all of the extra typographic options available (only on certain software however) you will have greater control over how your text is set.
[Posted by: Anthony Jones]
Filed under: Design Talk on January 16th, 2009 |