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<H1><A NAME="SECTION002540000000000000000">
H.4 Hints</A>
</H1>
<A NAME="31214"></A>

<P>
When making images and perspective views of large amounts of
data, the <A NAME="tex2html1785"
  HREF="http://gmt.soest.hawaii.edu"><B>GMT</B></A> programs can take some time to run, the resulting
<I>PostScript</I> files can be very large, and the time to display
the plot can be long.  Fine tuning a plot script can take lots
of trial and error.  We recommend using <A NAME="tex2html1786"
  HREF="../man/grdsample.html"><I><B>grdsample</B></I></A><A NAME="31424"></A> to make
a low resolution version of the data files you are plotting, and
practice with that, so it is faster; when the script is perfect,
use the full-resolution data files.  We often begin building a
script using only <A NAME="tex2html1787"
  HREF="../man/psbasemap.html"><I><B>psbasemap</B></I></A><A NAME="31429"></A> or <A NAME="tex2html1788"
  HREF="../man/pscoast.html"><I><B>pscoast</B></I></A><A NAME="31434"></A> to get
the various plots oriented correctly on the page; once this works
we replace the <A NAME="tex2html1789"
  HREF="../man/psbasemap.html"><I><B>psbasemap</B></I></A><A NAME="31439"></A> calls with the actually desired
<A NAME="tex2html1790"
  HREF="http://gmt.soest.hawaii.edu"><B>GMT</B></A> programs.

<P>
If you want to make color shaded relief images and you haven't
had much experience with it, here is a good first cut at the
problem:  Set your <B>COLOR_MODEL</B> to HSV using <A NAME="tex2html1791"
  HREF="../man/gmtset.html"><I><B>gmtset</B></I></A><A NAME="31447"></A>.  Use
<A NAME="tex2html1792"
  HREF="../man/makecpt.html"><I><B>makecpt</B></I></A><A NAME="31452"></A> or <A NAME="tex2html1793"
  HREF="../man/grd2cpt.html"><I><B>grd2cpt</B></I></A><A NAME="31457"></A> to make a continuous color
palette spanning the range of your data.  Use the <B>-Nt</B>
option on <A NAME="tex2html1794"
  HREF="../man/grdgradient.html"><I><B>grdgradient</B></I></A><A NAME="31463"></A>.  Try the result, and then play with
the tuning of the <U>.gmtdefaults4</U>, the cpt file, and
the gradient file.
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  HREF="node208.html">I. Color Space: The</A>
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  HREF="node203.html">H. Problems with display</A>
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  HREF="node206.html">H.3 European characters</A>
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<ADDRESS>
Paul Wessel
2010-07-14
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