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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 /pamgradient.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 'pamgradient.html')
| -rw-r--r-- | pamgradient.html | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/pamgradient.html b/pamgradient.html new file mode 100644 index 00000000..b6369536 --- /dev/null +++ b/pamgradient.html @@ -0,0 +1,108 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> +<HTML> +<HEAD> + <TITLE>Pamgradient User Manual</TITLE> +</HEAD> +<BODY> + +<H1>pamgradient</H1>Updated: 21 October 2005 +<BR> +<A href="#index">Table Of Contents</A> + +<H2 id="name">NAME</H2> +pamgradient - create a four-corner gradient PAM or PNM image + +<H2 id="synopsis">SYNOPSIS</H2> + +<B>pamgradient</B> +[<B>-maxval=</B><I>maxval</I>] +<I>color-tl</i> <i>color-tr</i> <i>color-bl</i> <i>color-br</i> +<br> +<i>width</i> <i>height</I> + + +<p>Minimum unique abbreviation of option is acceptable. You may use double +hyphens instead of single hyphen to denote options. You may use white +space in place of the equals sign to separate an option name from its value. + + +<H2 id="description">DESCRIPTION</H2> + +<P>This program is part of <A href="index.html">Netpbm</A>. + +<P><B>pamgradient</B> creates an image of the specified +dimensions <I>width</I> by <I>height</I> which contains a smooth, +two-dimensional gradient between the specified colors of the four +corners (from top left to bottom right). + +<P>Specify the colors as described for the <a +href="libppm.html#colorname">argument of the <b>ppm_parsecolor()</b> +library routine</a>. + + +<P>If all four colors are gray values, <B>pamgradient</B> creates a +grayscale image (PAM tuple type GRAYSCALE). Otherwise, it creates +a color image (PAM tuple type RGB). + +<H2 id="options">OPTIONS</H2> + +<DL compact> + <DT><B>-maxval=</B><I>maxval</I> + + <DD>maxval of the generated image. (See <a href="pam.html">PAM</a> and + <a href="pnm.html">PNM</a> specifications). +</DL> + +<H2 id="see_also">SEE ALSO</H2> + +<A href="ppmmake.html"><b>ppmmake</b></A>, +<A href="ppmrainbow.html"><b>ppmrainbow</b></A>, +<A href="pgmramp.html"><b>pgmramp</b></A>, +<A href="ppmpat.html"><b>ppmpat</b></A>, +<A href="pam.html">pam</A>, +<A href="pnm.html">pnm</A> + +<H2 id="note">NOTE</H2> + +<P>Only the top left corner of the generated image has exactly +the specified color. The color of the top right corner is a bit +shifted to the left, the bottom left corner a bit up, and the +bottom right corner left and up. This ensures nice transitions +when combining adjacent (very narrow) gradients, and doesn't play +a role when the gradient butts against a solid surface. + +<P>This effect is created by the integer arithmetic used for the +interpolation of the color values, and since it doesn't make a +difference for all practical purposes I might as well sell it as a +feature. + +<h2 id="history">HISTORY</h2> + +<p><b>pamgradient</b> was new in Netpbm 10.31 (December 2005). + +<H2 id="author">AUTHOR</H2> + +<P>pamgradient was written by Daniel Haude in October 2005. +<HR> + +<H2 id="index">Table Of Contents</H2> + +<UL> + <LI><A href="#name">NAME</A> + + <LI><A href="#synopsis">SYNOPSIS</A> + + <LI><A href="#description">DESCRIPTION</A> + + <LI><A href="#options">OPTIONS</A> + + <LI><A href="#see_also">SEE ALSO</A> + + <LI><A href="#note">NOTE</A> + + <LI><A href="#history">HISTORY</A> + + <LI><A href="#author">AUTHOR</A> +</UL> +</BODY> +</HTML> |