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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 /pamstretch.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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| -rw-r--r-- | pamstretch.html | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/pamstretch.html b/pamstretch.html new file mode 100644 index 00000000..0c4247df --- /dev/null +++ b/pamstretch.html @@ -0,0 +1,131 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN"> +<HTML><HEAD><TITLE>Pamstretch User Manual</TITLE></HEAD> +<BODY> +<H1>pamstretch</H1> +Updated: 11 November 2001 +<BR> +<A HREF="#index">Table Of Contents</A> + +<A NAME="lbAB"> </A> +<H2>NAME</H2> + +pamstretch - scale up a PNM or PAM image by interpolating between pixels. + +<A NAME="lbAC"> </A> +<H2>SYNOPSIS</H2> + +<B>pamstretch</B> + +[<B>-xscale=</B><I>X</I>] + +[<B>-yscale=</B><I>Y</I>] + +<BR> + +[<B>-blackedge</B>] + +[<B>-dropedge</B>] + +<I>N</I> + +[<I>infile</I>] + +<P>You can use the minimum unique abbreviation of the options. You can use +two hyphens instead of one. You can separate an option name from its value +with white space instead of an equals sign. + +<A NAME="lbAD"> </A> +<H2>DESCRIPTION</H2> + +<p>This program is part of <a href="index.html">Netpbm</a>. + +<p><B>pamstretch </B> scales up pictures by integer values, either +vertically, horizontally, or both. <B>pamstretch </B> differs from +<B>pamscale</B> and <B>pamenlarge</B> in that when it inserts the +additional rows and columns, instead of making the new row or column a +copy of its neighbor, <B>pamstretch</B> makes the new row or column an +interpolation between its neighbors. In some images, this produces +better looking output. + +<P>To scale up to non-integer pixel sizes, e.g. 2.5, try <B><A +HREF="pamstretch-gen.html">pamstretch-gen</A></B> instead. + +<P>Options let you select alternative methods of dealing with the +right/bottom edges of the picture. Since the interpolation is done +between the top-left corners of the scaled-up pixels, it's not obvious +what to do with the right/bottom edges. The default behaviour is to +scale those up without interpolation (more precisely, the right edge +is only interpolated vertically, and the bottom edge is only +interpolated horizontally), but there are two other possibilities, +selected by the <B>blackedge</B> and <B>dropedge</B> options. + +<A NAME="lbAE"> </A> +<H2>PARAMETERS</H2> + +<P>The <I>N</I> parameter is the scale factor. It is valid only if +you <em>don't</em> specify <B>-xscale</B> or <B>-yscale</B>. In that +case, <B>pamstretch</B> scales in both dimensions and by the scale +factor <I>N</I>. + +<A NAME="lbAF"> </A> +<H2>OPTIONS</H2> + +<DL COMPACT> +<DT><B>-xscale=</B><I>X</I> + +<DD>This is the horizontal scale factor. If you don't specify this, but do +specify a vertical scale factor, the horizontal scale factor is 1. + +<DT><B>-yscale=</B><I>Y</I> + +<DD>This is the vertical scale factor. If you don't specify this, but +do specify a horizontal scale factor, the vertical scale factor is 1. + +<DT><B>-blackedge</B> + +<DD>interpolate to black at right/bottom edges. + +<DT><B>-dropedge</B> + +<DD>drop one (source) pixel at right/bottom edges. This is arguably +more logical than the default behaviour, but it means producing output +which is a slightly odd size. + +</DL> + +<A NAME="lbAG"> </A> +<H2>BUGS</H2> + +<p>Usually produces fairly ugly output for PBMs. For most PBM input +you'll probably want to reduce the `noise' first using something like +<B><A HREF="pnmnlfilt.html">pnmnlfilt</A></B>. + +<A NAME="lbAH"> </A> +<H2>SEE ALSO</H2> + +<B><A HREF="pamstretch-gen.html">pamstretch-gen</A></B>, +<B><A HREF="pamenlarge.html">pamenlarge</A></B>, +<B><A HREF="pamscale.html">pamscale</A></B>, +<B><A HREF="pnmnlfilt.html">pnmnlfilt</A></B> + +<A NAME="lbAI"> </A> +<H2>AUTHOR</H2> + +<p>Russell Marks (<A +HREF="mailto:russell.marks@ntlworld.com">russell.marks@ntlworld.com</A>). + +<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">PARAMETERS</A> +<LI><A HREF="#lbAF">OPTIONS</A> +<LI><A HREF="#lbAG">BUGS</A> +<LI><A HREF="#lbAH">SEE ALSO</A> +<LI><A HREF="#lbAI">AUTHOR</A> +</UL> +</BODY> +</HTML> |