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<h4><a name="shading-transparent">8.4.4 <code>transparent</code></a></h4>
<p>Paints markers in a transparent version of their
selected colour.
The degree of transparency is determined by
how many points are plotted on top of each other
and by the opaque limit.
The opaque limit fixes how many points must be
plotted on top of each other to completely obscure
the background. This is set to a fixed value,
so a transparent level that works well for a crowded
region (or low magnification) may not work so well
for a sparse region (or when zoomed in).
</p>
<p>
<strong>Usage:</strong>
<pre>
shadingN=transparent colorN=<rrggbb>|red|blue|... opaqueN=<number>
</pre>
</p>
<p>All the parameters listed here
affect only the relevant layer,
identified by the suffix
<code>N</code>.
</p>
<p>
<strong>Example:</strong>
</p>
<div align="center"><img src="plot2-shading-transparent.png" alt="" align="middle"></div>
<p><pre> stilts plot2plane layer1=mark in1=dr5qso.fits
<strong>shading1=transparent</strong>
x1=psfmag_g-psfmag_r y1=psfmag_u-psfmag_g size1=2
xmin=-0.5 xmax=2.5 ymin=-1 ymax=6</pre></p>
<p>Associated parameters are as follows:
<dl>
<dt><strong><code>colorN = <rrggbb>|red|blue|...</code> <em>(<a href="http://docs.oracle.com/javase/6/docs/api/java/awt/Color.html">Color</a>)</em></strong></dt>
<dd>The color of plotted data,
given by name or as a hexadecimal RGB value.
<p>The standard plotting colour names are
<code>red</code>, <code>blue</code>, <code>green</code>, <code>grey</code>, <code>magenta</code>, <code>cyan</code>, <code>orange</code>, <code>pink</code>, <code>yellow</code>, <code>black</code>, <code>light_grey</code>, <code>white</code>.
However, many other common colour names (too many to list here)
are also understood.
The list currently contains those colour names understood
by most web browsers,
from <code>AliceBlue</code> to <code>YellowGreen</code>,
listed e.g. in the
<em>Extended color keywords</em> section of
the <a href="http://www.w3c.org/TR/css3-color#svg-color">CSS3</a> standard.
</p>
<p>Alternatively, a six-digit hexadecimal number <em>RRGGBB</em>
may be supplied,
optionally prefixed by "<code>#</code>" or "<code>0x</code>",
giving red, green and blue intensities,
e.g. "<code>ff00ff</code>", "<code>#ff00ff</code>"
or "<code>0xff00ff</code>" for magenta.
</p>
<p>[Default: <code>red</code>]
</p>
</dd>
<dt><strong><code>opaqueN = <number></code> <em>(Double)</em></strong></dt>
<dd>The opacity of plotted points.
The value is the number of points which have to be
overplotted before the background is fully obscured.
<p>[Default: <code>4</code>]
</p>
</dd>
</dl>
</p>
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<hr><i>STILTS - Starlink Tables Infrastructure Library Tool Set<br>Starlink User Note256<br>STILTS web page:
<a href="http://www.starlink.ac.uk/stilts/">http://www.starlink.ac.uk/stilts/</a><br>Author email:
<a href="mailto:m.b.taylor@bristol.ac.uk">m.b.taylor@bristol.ac.uk</a><br>Mailing list:
<a href="mailto:topcat-user@jiscmail.ac.uk">topcat-user@jiscmail.ac.uk</a><br></i></body>
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