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Manual Section... (1) - page: ppmtolss16

 

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 0x1413f3dmagic (littleendian)
unint16 xsizelittleendian
unint15 ysizelittleendian
16 x unint8 r,g,bcolor 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 format.

 

SEE ALSO

ppmtolss16(1)

 

AUTHOR

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


 

Index

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
BUG
SEE ALSO
AUTHOR

This document was created by man2html, using the manual pages.
Time: 15:26:19 GMT, June 11, 2010

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