GRFCOMPRESS(1)         COMMAND REFERENCE         GRFCOMPRESS(1)



NAME
     grf_compress - compress a GRF file

SYNOPSIS
     grfcompress

DESCRIPTION
     The grfcompress program consolidates rows of identical
     pixel information and repeated patterns into a more concise
     form in Generic Raster Format (GRF) files.  GRF files are
     compressed to save storage space and reduce network data
     transfer time because screendata and copydata files can be
     quite large, sometimes exceeding 2 Mbytes.

     This program has no command line parameters.  Input is from
     standard input and output is to standard output.  Everything
     grfcompress needs to know is in the GRF header.

     Three levels of compression are supported:  pixel, simple,
     and pattern; they are described, along with GRF headers and
     tags, in grf(5).

     This program does not compress a file that has already been
     compressed. The optimal level of compression is accomplished
     in the first pass.

     For information on expanding compressed files, see
     grf_expand(1).

FILES
     stdin          Input is a normal uncompressed GRF
                    screendata or copydata file.

     stdout         Output is a compressed GRF screendata or
                    copydata file.

DIAGNOSTICS
     If a problem prevents file compression, grfcompress aborts
     and prints a self-explanatory error message.

CAVEATS
     The grfcompress command will not compress a monochrome data
     file consisting of a 1-bit pixel field width.

SEE ALSO
     grf_expand(1), processing(1), screencopy(1), st_grf(1),
     x_grf(1), tcpr(1mdqs), grf(5), tcprdrv_Tek4692(8mdqs),
     tcprdrv_Tek4693D(8mdqs), tcprdrv_Tek4696(8mdqs), and
     tcprserver(8mdqs).

REFERENCES
     For more information, consult the Users Manual for your



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GRFCOMPRESS(1)         COMMAND REFERENCE         GRFCOMPRESS(1)



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