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RLETOABA62(1)          DragonFly General Commands Manual         RLETOABA62(1)


NAME

       rletoabA62 - Convert from RLE Format to Abekas A62 Dump Format


SYNOPSIS

       rletoabA62 [ -N ] [ -f n ] [ -n n ] [ infile ]


DESCRIPTION

       RletoabA62 converts a raster file in the Utah Raster Toolkit RLE format
       into a format suitable for writing to an Abekas A62 dump tape and
       subsequent loading onto the Abekas disk.  The generated image is 768
       pixels wide and 512 pixels high.  If the input is larger, it is
       truncated.  If it is smaller, it is padded on the top and right with
       black.  The output is written to stdout, and should be written to a
       tape in 24K byte blocks with dd as in the following:

            dd of=/dev/rmt8 obs=24k

       Normally, the output is processed with a simple digital filter; this
       feature may be turned off with an option.  RletoabA62 normally writes
       two consecutive frames, normally starting at frame 1.

       Input is taken from stdin unless a file name is given on the command
       line.  Only a single file may be given, and so if multiple invocations
       of rletoabA62 are performed in a script, care must be taken to tell the
       program to convert the data for the proper Abekas frame number (1-4).
       Otherwise, the colors will appear wrong; they will be rotated on a
       vector scope diagram.


EXAMPLE

       The following example converts all files ending in .rle in the current
       directory and writes them to a tape.  Two frames are written per image
       and the frame number is incremented accordingly.

                 frame=1
                 number=2
                 for file in *.rle
                 do
                      rletoabA62 -f $frame $file
                      frame=`expr \( \( $frame - 1 \) + $number \) % 4 + 1`
                 done |
                 dd of=/dev/rmt8 obs=24k


OPTIONS

       Options are parsed by getopt(3).

       -N     Do not apply digital filtering.

       -f n   Create the first frame as Abekas frame number n, having a value
              from one to four.  Consecutive frames increment this number
              modulo four.  The default is one.

       -n n   Write n frames of output, incrementing the frame number each
              time.  The default is two.


SEE ALSO

       urt(1), RLE(5).


AUTHOR

       Bob Brown, RIACS.


BUGS

       This program does not preserve the aspect ratio of the input.

1                               6 February 1988                  RLETOABA62(1)

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