compositefor visual browsing, and so on. On the other hand, it can't construct a PostScript file from a GIF.
Some of the constructions are slow and/or require a lot of temporary space.
db_buildto handle them. To do this, you must define a routine (called a checker) to checks whether a format is up to date (exists and is complete). If it is possible to construct the new format from some existing format (e.g. create JPEG from TIFF) or to construct an existing format from the new one (e.g. make GIF from Microsoft Word.) then you may choose to define one or more (a transformer) routines. A transformer translates one kind of format to another.
The routines must be placed in the file
This file has many examples of checkers and transformers,
some simple, some complex.
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