This is the command ppmtolss16 that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
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 format.
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