(tds.info)Valid font bitmaps

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3.2.2 Valid font bitmaps
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The TWG recognizes that the use of short filenames has many
disadvantages.  The most vexing is that it results in the creation of
dozens of different files with the same name.  At a typical site,
`cmr10.pk' will be the filename for Computer Modern Roman 10pt at 5-10
magnifications for 2-3 modes. (Section Note: Duplicate filenames
discusses duplicate filenames in general.)

   To minimize this problem, we strongly recommend that PK files
contain enough information to identify precisely how they were created:
at least the mode, base resolution, and magnification used to create the
font.

   This information is easy to supply: a simple addition to the local
modes used for building the fonts with Metafont will automatically
provide the required information.  If you have been using a local modes
file derived from (or that is simply) `modes.mf' (see Appendix Note:
Related references), the required information is already in your PK
files.  If not, a simple addition based on the code found in `modes.mf'
can be made to your local modes file and the PK files rebuilt.