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<!DOCTYPE doctype PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<title>Color</title>
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<body alink="#FF0000" bgcolor="#FFFFFF" link="#0000EE" text=
"#000000" vlink="#551A8B">
<h3><img alt="" src="../sun.gif" align="middle" width="100" height=
"98"> Colorbar<br></h3>
<blockquote>
<p><b>Color Tags</b></p>
<p>The purpose of color tags are to highlight (or hide) certain
values of data, regardless of the color map selected. The user
creates, edits, and deletes color tags via the GUI. To create a
color tag, enter the Colorbar Mode, and click once on the colorbar.
This creates a default color tag. Click and drag to change the
values. Click and drag on one side to increase or decrease the
value. Double click to manually edit the values and color. Place
the cursor over the color tag and press the delete key to delete
it. From the color parameters dialog, the user can load, save, and
delete all color tags for that frame.<br></p>
<p><b>Visuals</b></p>
<p>DS9 supports a number of color environments. Not all color
environments, or visuals, are available on most machines. In fact,
you may be restricted to one or two, base on the color graphics
hardware your computer has. A color visual is composed of two
parts, the color model and the bit depth. Pseudo color uses a color
lookup table to derive the correct color, True color uses the value
directly as a RGB triplet, to derive the correct color. The follow
is a list of the color visuals DS9 currently supports:</p>
<blockquote><tt>pseudo color, 8 bit<br>
true color, 8 bit<br>
true color, 15 bit<br>
true color, 16 bit<br>
true color, 24 bit</tt></blockquote>
<p>You can use the <tt>xdpyinfo</tt> command to see if one of these
visual are available. NOTE: Linux Users-- if your desired visual is
not available, use the Xconfigarator command (Red Hat) or similar
command under other versions of linux, to configure your X window
visuals.</p>
<p>When DS9 is invoked, by default, it will use the default visual.
You can find out what the default visual is by using the
<tt>xdpyinfo</tt> command. You can also force DS9 to use another
visual by command line option. If you specify a visual, and it is
not available, DS9 will exit with an error message.</p>
<blockquote>
<tt>$ds9
# default visual, default depth<br>
$ds9 -visual pseudo # pseudo
color, default depth<br>
$ds9 -visual pseudocolor # pseudo color, default depth<br>
$ds9 -visual pseudocolor8 # pseudo color 8<br>
$ds9 -visual true #
true color, default depth<br>
$ds9 -visual truecolor # true color, default
depth<br>
$ds9 -visual truecolor8 # true color 8<br>
$ds9 -visual truecolor16 # true color 16<br>
$ds9 -visual truecolor24 # true color 24</tt></blockquote>
</blockquote>
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