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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 /pamtotga.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
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1 files changed, 126 insertions, 0 deletions
diff --git a/pamtotga.html b/pamtotga.html new file mode 100644 index 00000000..3f9ddce0 --- /dev/null +++ b/pamtotga.html @@ -0,0 +1,126 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN"> +<HTML><HEAD><TITLE>Pamtotga User Manual</TITLE></HEAD> +<BODY> +<H1>pamtotga</H1> +Updated: 21 July 2002 +<BR> + +<A HREF="#index">Table Of Contents</A> + +<A NAME="lbAB"> </A> +<H2>NAME</H2> + +pamtotga - convert a Netpbm image to a TrueVision Targa file + +<A NAME="lbAC"> </A> +<H2>SYNOPSIS</H2> + +<B>pamtotga</B> +[<B>-mono|-cmap|-rgb</B>] +[<B>-norle</B>] +[<I>pamfile</I>] + +<P>All options can be abbreviated to their shortest unique prefix. You +may use two hyphens instead of one to designate an option. You may +use either white space or equals signs between an option name and its +value. + +<A NAME="lbAD"> </A> +<H2>DESCRIPTION</H2> + +<p>This program is part of <a href="index.html">Netpbm</a>. + +<p><b>pamtotga</b> reads a PBM, PGM, PPM, or PAM image as input and +produces a TrueVision Targa file as output. The PAM image may be +either a BLACKANDWHITE, GRAYSCALE, RGB, or RGB_ALPHA image. + +<p>To create a TGA image with transparency (i.e. with an alpha mask), +use RGB_ALPHA PAM input. Some Netpbm programs that generate images with +alpha masks generate them in that format. For another way to create +the proper input stream, see <a href="pamstack.html"><b>pamstack</b></a>. + +<p>It is unclear that anything except <b>pamtotga</b> knows about TGAs +with transparency. The history behind this feature of <b>pamtotga</b> +is not clear. The format <b>pamtotga</b> produces is simply the same +as an ordinary RGB TGA image except with a 4th plane added for +transparency. The PixelSize field of the TGA header specifies 32 bits +instead of 24 and the raster has an extra byte added to each pixel, at +the tail end. The value of that byte has the same meaning as in a PAM +image with maxval 255. + +<A NAME="lbAE"> </A> +<H2>OPTIONS</H2> + +<DL COMPACT> +<DT><B>-cmap</B> +<DD> +Make output Targa file of type 24 bit colormapped. Input must contain no +more than 256 distinct colors. + +<DT><B>-mono</B> +<DD> +Make output Targa file of type 8 bit monochrome. Input must be PBM or PGM +or a PAM with BLACKANDWHITE or GRAYSCALE tuple type. +See <b>-cmap</b>. + +<p>You may specify at most one of <b>-mono</b>, <b>-cmap</b>, and +<b>-rgb</b>. If you specify neither, the default image type is the +most highly constrained compatible type is used, where monochrome is +more constrained than colormapped which is in turn more constrained +than unmapped. + +<DT><B>-rgb</B> +<DD> +Make output Targa file of type 24 bit unmapped color. See <b>-cmap</b>. + +<DT><B>-norle</B> +<DD>Do not use run-length encoding in the output Targa file. +Run-length encoded files are smaller, but Some Targa readers can't +read run-length encoded files. + +</DL> + +<A NAME="lbAG"> </A> +<H2>SEE ALSO</H2> + +<A HREF="tgatoppm.html">tgatoppm</A>, +<A HREF="pnmquant.html">pnmquant</a>, +<A HREF="pamstack.html">pamstack</a>, +<A HREF="pam.html">pam</A> +<A HREF="pnm.html">pnm</A> + +<A NAME="history"></A> +<H2>HISTORY</H2> + +<p>This program was called <b>ppmtotga</b> until Netpbm 10.6 (July 2002). +That was always a misnomer, though, because a PPM class program would not be +able to tell the difference between PGM and PPM input (it would all look like +PPM), and thus could not choose the output Targa image type based on the type +of the input. Netpbm 10.6 also added the ability to handle an alpha channel, +so it became a PAM class program. + +<p>In Netpbm 10.15 (April 2003), the program became the first in the +Netpbm package to recognize an alpha channel in a PAM. It recognized +tuple type "RGBA". But when this kind of PAM image was later +added to the PAM specification, it was specified with tuple type +"RGB_ALPHA". So in Netpbm 10-26 (January 2005), <b>pamtotga</b> +changed to recognize "RGB_ALPHA" instead of "RGBA". + +<A NAME="lbAH"> </A> +<H2>AUTHOR</H2> + +Copyright (C) 1989, 1991 by Mark Shand and Jef Poskanzer. + +<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="#lbAG">SEE ALSO</A> +<LI><A HREF="#lbAH">AUTHOR</A> +</UL> +</BODY> +</HTML> |