FACE(6)                                                   FACE(6)

     NAME
          face - face files

     DESCRIPTION
          The directories /usr/$user/lib/face and /lib/face contain a
          hierarchy of images of people.  In those directories are
          subdirectories named by the sizes of the corresponding image
          files: 48x48x1 (48 by 48 pixels, one bit per pixel); 48x48x2
          (48 by 48 pixels, two (grey) bits per pixel); 48x48x4 (48 by
          48 pixels, four (grey) bits per pixel); 48x48x8 (48 by 48
          pixels, eight (color-mapped) bits per pixel); 512x512x8 (512
          by 512 pixels, eight (color-mapped) bits per pixel);
          512x512x24 (512 by 512 pixels, twenty-four bits per pixel (3
          times 8 bits per color)).  The large files serve no special
          purpose; they are stored as images (see image(6)). The small
          files are the `icons'  displayed by faces and seemail (see
          faces(1)); for depths less than 4, their format is special.

          One- and two-bit deep icons are stored as text, one line of
          the file to one scan line of display.  Each line is divided
          into 8-bit, 16-bit, or 32-bit big-endian words, stored as a
          list of comma-separated hexadecimal C constants, such as:

               0x9200, 0x1bb0, 0x003e,

          This odd format is historical and the programs that read it
          are somewhat forgiving about blanks and the need for commas.

          The files lib/face/*/.dict hold a correspondence between
          users at machines and face files.  The format is

               machine/user directory/file.ver

          The machine is the domain name of the machine sending the
          message, and user the name of the user sending it, as
          recorded in /sys/log/mail.  The directory is a further sub-
          directory of (say) /lib/face/48x48x1, named by a single let-
          ter corresponding to the first character of the user names.
          The file is the name of the file, typically but not always
          the user name, and ver is a number to distinguish different
          images, for example to distinguish the image for Bill Gates
          from the image for Bill Joy, both of which might otherwise
          be called b/bill.  For example, Bill Gates might be repre-
          sented by the line

               microsoft.com/bill b/bill.1

          If multiple entries exist for a user in the various .dict
          files, faces chooses the highest pixel size less than or
          equal to that of the display on which it is running.

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     FACE(6)                                                   FACE(6)

          Finally, or rather firstly, the file /lib/face/.machinelist
          contains a list of machine/domain pairs, one per line, to
          map any of a set of machines to a single domain name to be
          looked up in the .dict files.  The machine name may be a
          regular expression, so for example the entry

               .*research\.bell-labs\.com    astro

          maps any of the machines in Bell Labs Research into the
          shorthand name astro, which then appears as a domain name in
          the .dict files.

     SEE ALSO
          mail(1), tweak(1), image(6)

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