09-19-2012
Is 59 zero based as in start with the 60th character, and is 140 1-based, as in stop with the 140th character (I guss it could be zero-based stop before the cahracter at offset 140)?
The values are indented and divided into groups -- is that what the file looks like? You want the same indentation and division in the output?
ksh/bash can read the 6 fields into an array of variables, save the pairs of numbers in a secondary array, mathematically decompose the numbers into line, field and offset, and compose the output with the same white space. Some line's field values will set a state variable, and the right state begins the field cutting. Initial state says you capture and print from the ID line, second state is look for and print from the FT COILED lines or find SQ SEQUENCE, and SQ SEQUENCE says start looking for the subset of output fields. I assume the COILED lines are forward sequenced.
Last edited by DGPickett; 09-19-2012 at 02:23 PM..
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LEARN ABOUT REDHAT
ppmtosixel
ppmtosixel(1) General Commands Manual ppmtosixel(1)
NAME
ppmtosixel - convert a portable pixmap into DEC sixel format
SYNOPSIS
ppmtosixel [-raw] [-margin] [ppmfile]
DESCRIPTION
Reads a portable pixmap as input. Produces sixel commands (SIX) as output. The output is formatted for color printing, e.g. for a DEC
LJ250 color inkjet printer.
If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled. A printer control header and a color assignment table
begin the SIX file. Image data is written in a compressed format by default. A printer control footer ends the image file.
OPTIONS
-raw If specified, each pixel will be explicitly described in the image file. If -raw is not specified, output will default to com-
pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands. A raw file is often an order of magni-
tude larger than a compressed file and prints much slower.
-margin
If -margin is not specified, the image will be start at the left margin (of the window, paper, or whatever). If -margin is speci-
fied, a 1.5 inch left margin will offset the image.
PRINTING
Generally, sixel files must reach the printer unfiltered. Use the lpr -x option or cat filename > /dev/tty0?.
BUGS
Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion. If the original PPM maxval was
greater than 100, rescaling also reduces the image depth. While the actual RGB values from the ppm file are more or less retained, the
color palette of the LJ250 may not match the colors on your screen. This seems to be a printer limitation.
SEE ALSO
ppm(5)
AUTHOR
Copyright (C) 1991 by Rick Vinci.
26 April 1991 ppmtosixel(1)