ppmtolss16

PPMTOLSS16(1)                                                    PPMTOLSS16(1)



NAME
       ppmtolss16 — Convert a PPM to an LSS16 image

SYNOPSIS
       ppmtolss16 [               #rrggbb=i            ...]  [< input.ppm]  [>
       output.rle]

DESCRIPTION
       This manual page documents briefly the ppmtolss16 command.


       The ppmtolss16 program converts a "raw" PPM file with max 16 colors  to
       a simple RLE-based format:


       simple RLE-based format

       unint32 0x1413f3d   magic (littleendian)
       unint16 xsize       littleendian
       unint15 ysize       littleendian
       16 x unint8 r,g,b   color map

       Color map is in 6-bit format (each byte is 0..63)

       Then, a sequence of nybbles:

       N    ... if N is != previous pixel, one pixel of color N, otherwise run
       sequence follows ...


       M   ... if M > 0 then run length is  M+1,  otherwise  run  sequence  is
       encoded in two nybbles, littleendian, +17


       The nybble sequences are on a per-row basis, runs may not extend across
       rows and odd-nybble rows are zero-padded.


       At the start of a row, the "previous pixel" is assumed to be zero.


OPTIONS
       A summary of options is included below.

       #rrggbb=i Specify that the color #rrggbb (hex) should be assigned index
                 i (decimal).


BUG
       This program cannot handle comments in the header, nor "plain" ppm for‐
       mat.


SEE ALSO
       ppmtolss16(1)


AUTHOR
       This manual page was compiled by dann  frazier    for
       the  Debian  GNU/Linux system (but may be used by others).  Most of the
       content was written by H. Peter Anvin.



                                                                 PPMTOLSS16(1)