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| author | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2006-12-25 03:06:05 +0000 |
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| committer | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2006-12-25 03:06:05 +0000 |
| commit | 1017cbebe5d5edd859e0fddad0a8600f509f4821 (patch) | |
| tree | 78bdf336648566f7a7d55f42837357dea3dd674c /ppmtosixel.html | |
| parent | 16f2ac126651015a376eba864a3a35f738b0b25a (diff) | |
| download | netpbm-mirror-1017cbebe5d5edd859e0fddad0a8600f509f4821.tar.gz netpbm-mirror-1017cbebe5d5edd859e0fddad0a8600f509f4821.tar.xz netpbm-mirror-1017cbebe5d5edd859e0fddad0a8600f509f4821.zip | |
Place user guide into Subversion repository
git-svn-id: http://svn.code.sf.net/p/netpbm/code/userguide@181 9d0c8265-081b-0410-96cb-a4ca84ce46f8
Diffstat (limited to 'ppmtosixel.html')
| -rw-r--r-- | ppmtosixel.html | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/ppmtosixel.html b/ppmtosixel.html new file mode 100644 index 00000000..e9b6d63a --- /dev/null +++ b/ppmtosixel.html @@ -0,0 +1,100 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN"> +<HTML><HEAD><TITLE>Ppmtosixel User Manual</TITLE></HEAD> +<BODY> +<H1>ppmtosixel</H1> +Updated: 26 April 1991 +<BR> +<A HREF="#index">Table Of Contents</A> + +<A NAME="lbAB"> </A> +<H2>NAME</H2> + +ppmtosixel - convert a PPM image to DEC sixel format + +<A NAME="lbAC"> </A> +<H2>SYNOPSIS</H2> + +<B>ppmtosixel</B> + +[<B>-raw</B>] + +[<B>-margin</B>] + +[<I>ppmfile</I>] + +<A NAME="lbAD"> </A> +<H2>DESCRIPTION</H2> + +<p>This program is part of <a href="index.html">Netpbm</a>. + +<p><b>ppmtosixel</b> reads a PPM image as input and produces sixel +commands (SIX) as output. The output is formatted for color printing, +e.g. for a DEC LJ250 color inkjet printer. + +<P>If RGB values from the PPM file do not have maxval=100, +<b>ppmtosixel</b> rescales them to maxval 100. A printer control +header and a color assignment table begin the SIX file. Image data is +in a compressed format by default. A printer control footer ends the +image file. + +<A NAME="lbAE"> </A> +<H2>OPTIONS</H2> + +<DL COMPACT> +<DT><B>-raw</B> + +<DD>If you specify this, each pixel will be explicitly described in +the image file. If <B>-raw</B> is not specified, output will default +to compressed format in which identical adjacent pixels are replaced +by "repeat pixel" commands. A raw file is often an order of +magnitude larger than a compressed file and prints much slower. + +<DT><B>-margin</B> + +<DD>If you don't specify <B>-margin</B>, the image will start at the +left margin (of the window, paper, or whatever). If you <em>do</em> +specify <B>-margin</B>, a 1.5 inch left margin will offset the image. + +</DL> + +<A NAME="lbAF"> </A> +<H2>PRINTING</H2> + +<p>Generally, sixel files must reach the printer unfiltered. +Use the lpr -x option or <b>cat filename > /dev/tty0?</b>. + +<A NAME="lbAG"> </A> +<H2>LIMITATIONS</H2> + +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. + +<A NAME="lbAH"> </A> +<H2>SEE ALSO</H2> + +<A HREF="ppm.html">ppm</A> + +<A NAME="lbAI"> </A> +<H2>AUTHOR</H2> + +Copyright (C) 1991 by Rick Vinci. + +<HR> +<A NAME="index"> </A> +<H2>Table Of Contents</H2> +<UL> +<LI><A HREF="#lbAB">NAME</A> +<LI><A HREF="#lbAC">SYNOPSIS</A> +<LI><A HREF="#lbAD">DESCRIPTION</A> +<LI><A HREF="#lbAE">OPTIONS</A> +<LI><A HREF="#lbAF">PRINTING</A> +<LI><A HREF="#lbAG">LIMITATIONS</A> +<LI><A HREF="#lbAH">SEE ALSO</A> +<LI><A HREF="#lbAI">AUTHOR</A> +</UL> +</BODY> +</HTML> |