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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<title>Introduction to the ds9 Interface - DS9 </title>
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<!--THIS FILE IS CREATED AUTOMATICALLY - DO NOT EDIT MANUALLY-->
<body><div class="mainbar">
<a name="maintext"></a><div align="center"><h1>Introduction to the ds9 Interface</h1></div>
<p>
Return to the <a href="../index.html">DS9 Users Manual</a></p>
<hr size="5" noshade>
<div>
<h2>Synopsis</h2>
<p>
This thread provides an overview of the key components of
the ds9 graphical user interface (GUI).
</p>
<p>
If you encounter any problems, please email saord @ cfa.harvard.edu.
</p>
</div>
<hr size="5" noshade>
<h2><a name="toc">Contents</a></h2>
<ul>
<li>
<strong><a href="index.html#gui">The ds9 Interface</a></strong><ol type="1">
<li><a href="index.html#gui.menu">Menu bar</a></li>
<li><a href="index.html#gui.info">Information panel</a></li>
<li><a href="index.html#gui.pan">Panner</a></li>
<li><a href="index.html#gui.mag">Magnifier</a></li>
<li><a href="index.html#gui.buttons">Buttons</a></li>
<li><a href="index.html#gui.frame">Display frame</a></li>
<li><a href="index.html#gui.color">Colorbar</a></li>
</ol>
</li>
<li><strong><a href="index.html#preferences">Setting and Saving View Preferences</a></strong></li>
<li><strong><a href="index.html#history">History</a></strong></li>
<li>
<strong>Images</strong><ul>
<li><a href="#components">Figure 1: The ds9 GUI</a></li>
<li><a href="#vertical">Figure 2: The ds9 GUI, vertical layout</a></li>
<li><a href="#menu">Figure 3: Menu bar</a></li>
<li><a href="#menutear">Figure 4: Tearing off a Menu</a></li>
<li><a href="#info">Figure 5: Information panel</a></li>
<li><a href="#panner">Figure 6: Panner</a></li>
<li><a href="#mag">Figure 7: Magnifier</a></li>
<li><a href="#button">Figure 8: Buttons</a></li>
<li><a href="#frame">Figure 9: Tiled frame display</a></li>
<li><a href="#color">Figure 10: Colorbar</a></li>
<li><a href="#prefs">Figure 11: Preferences dialog box</a></li>
</ul>
</li>
</ul>
<hr>
<div class="sectionlist">
<div class="section">
<h2><a name="gui">The ds9 Interface</a></h2>
<p>
This thread uses Chandra data from an observation of the
Trapezium Cluster (ObsID 1522). The default ds9 GUI is
shown in <a href="#components">Figure 1</a>. The main components
are numbered:
</p>
<ol type="1">
<li>Menu bar</li>
<li>Information panel</li>
<li>Panner</li>
<li>Magnifier</li>
<li>Buttons</li>
<li>Display frame</li>
<li>Colorbar</li>
</ol>
<div class="figure">
<div class="caption"><h3><a name="components">Figure 1: The ds9 GUI</a></h3></div>
<div><img alt="[The default ds9 display includes the information panel, panner, magnifier, and colorbar.]" src="components.png"></div>
</div>
<p>
The default setup is a "horizontal layout", with the
information panel, panner, magnifier, and buttons displayed
horizontally across the window. This may be changed to
"vertical layout" in the View menu (<a href="#vertical">Figure 2</a>).
</p>
<div class="figure">
<div class="caption"><h3><a name="vertical">Figure 2: The ds9 GUI, vertical layout</a></h3></div>
<div><img alt="[In the vertical layout, the information panel, panner, magnifier, and buttons are displayed vertically at the left of the data frame.]" src="vertical.png"></div>
</div>
<p>
Note that the colorbar remained horizontal at the bottom of
the display frame. This may be changed with the "vertical
colorbar" option in the "View" menu.
</p>
<div class="subsectionlist">
<div class="subsection">
<h3><a name="gui.menu">1. Menu bar</a></h3>
<p>
The menu bar provides access to all of ds9's
capabilities. For a complete description of each menu,
refer to the <a href="../../ref/gui.html">Menu bar
section of the Reference Manual</a>.
</p>
<div class="figure">
<div class="caption"><h3><a name="menu">Figure 3: Menu bar</a></h3></div>
<div><img alt="[The menu bar of the ds9 GUI.]" src="menu.png"></div>
</div>
<p>
All ds9 menus can be "torn off" to be a separate window
from the main GUI. To tear off a menu, select the
dashed line, which is the first item of each menu (shown
in <a href="#menutear">Figure 4</a>). The menu will become its
own window.
</p>
<div class="figure">
<div class="caption"><h3><a name="menutear">Figure 4: Tearing off a Menu</a></h3></div>
<div><img alt='[The dashed line at the top of the "View" menu is highlighted.]' src="menutear.png"></div>
</div>
<hr width="80%" align="center">
</div>
<div class="subsection">
<h3><a name="gui.info">2. Information panel</a></h3>
<p>
The information panel displays information about the
data file and the values at the cursor position. In
<a href="#info">Figure 5</a>, the object name has been
loaded from the header of the data file. The image
value and position (in WCS, physical, and image
coordinates) are updated in real time as the cursor is
moved.
</p>
<p>
The fields of the information panel can be customized
from the "View" menu. Any of the default entries can be
removed, and additional fields can be added
(e.g. detector coordinates, min/max data values).
</p>
<div class="figure">
<div class="caption"><h3><a name="info">Figure 5: Information panel</a></h3></div>
<div><img alt="[The information panel of the ds9 GUI.]" src="info.png"></div>
</div>
<hr width="80%" align="center">
</div>
<div class="subsection">
<h3><a name="gui.pan">3. Panner</a></h3>
<p>
The panner allows the user to view areas of the frame
which are outside of the current field of view.
Although the display frame is filled by the data, the
panner indicates that more of the image is
available. Clicking and dragging the viewing bounding
box in the panner - shown in blue in
<a href="#panner">Figure 6</a> - will display a different
portion of the image.
</p>
<p>
The panner also contains axes to indicate the directions
of North and East and the directions of the physical
(x,y) data axes.
</p>
<div class="figure">
<div class="caption"><h3><a name="panner">Figure 6: Panner</a></h3></div>
<div><img alt="[The panner of the ds9 GUI.]" src="panner.png"></div>
</div>
<hr width="80%" align="center">
</div>
<div class="subsection">
<h3><a name="gui.mag">4. Magnifier</a></h3>
<p>
The magnifier displays a magnified view of the current
cursor location. The magnifier cursor - the small square
in the center of <a href="#mag">Figure 7</a> - outlines
the size and orientation of one pixel, taking into
account the current frame zoom and orientation.
</p>
<div class="figure">
<div class="caption"><h3><a name="mag">Figure 7: Magnifier</a></h3></div>
<div><img alt="[The magnifier of the ds9 GUI.]" src="mag.png"></div>
</div>
<hr width="80%" align="center">
</div>
<div class="subsection">
<h3><a name="gui.buttons">5. Buttons</a></h3>
<p>
The button bar duplicates many of the options available
from the menu bar. The buttons provide quick access to
change the most frequently-used ds9 actions
(e.g. changing the scale and color bar, blinking and
tiling frames).
</p>
<p>
When a category is chosen from the top row, the options
within that category are displayed in the bottom row of
buttons. In <a href="#button">Figure 8</a>, the color category is
chosen and the bottom row shows the ten most-used
colormap options (additional colormaps are available
from the "Color" menu).
</p>
<div class="figure">
<div class="caption"><h3><a name="button">Figure 8: Buttons</a></h3></div>
<div><img alt="[The buttons of the ds9 GUI.]" src="button.png"></div>
</div>
<hr width="80%" align="center">
</div>
<div class="subsection">
<h3><a name="gui.frame">6. Display frame</a></h3>
<p>
The display frame is the area of ds9 where the FITS
image is shown. In <a href="#components">Figure 1</a>, a single
frame is shown.
</p>
<p>
Multiple frames can be opened in ds9 at the same time.
In <a href="#frame">Figure 9</a>, nine frames have been
opened and set to "tile" display from the "frame"
button. The current frame is indicated by a blue
outline around it (second row, center frame). How the
frames are tiled is set in the "Frame → Frame
Parameters → Tile" menu; the default is to tile
the frames in a grid.
</p>
<div class="figure">
<div class="caption"><h3><a name="frame">Figure 9: Tiled frame display</a></h3></div>
<div><img alt="[Nine frames in the ds9 GUI.]" src="frame.png"></div>
</div>
<p>
If the display is set back to "single", then the current
frame fills the display area. The other frames can be
accessed via the "previous" and "next" options in the
buttons bar (or from the "Frame" menu).
</p>
<p>
The "blink" option may also be used with multiple
frames. When blink is turned on, ds9 cycles through all
the available frames. The blink interval is set in the
"Frame → Frame Parameters → Blink Interval" menu.
</p>
<hr width="80%" align="center">
</div>
<div class="subsection">
<h3><a name="gui.color">7. Colorbar</a></h3>
<p>
The colorbar displays the colormap, bias, and contrast
settings. The colormap correlates the colors used in the
image with the pixel values in the data.
</p>
<p>
To change the colormap, use the "Color" menu or button.
The contrast and bias can be adjusted by right-clicking
and dragging on the ds9 display. The "Color →
Colormap Parameters" dialog box can also be used to
change contrast and bias.
</p>
<div class="figure">
<div class="caption"><h3><a name="color">Figure 10: Colorbar</a></h3></div>
<div><img alt="[The colorbar of the ds9 GUI.]" src="color.png"></div>
</div>
</div>
</div>
<hr>
</div>
<div class="section">
<h2><a name="preferences">Setting and Saving View Preferences</a></h2>
<p>
All of the view options described in this thread can be set
and saved as a preference. Open the "Preferences" dialog box
from the "Edit" menu and select the "View" tab, shown in
<a href="#prefs">Figure 11</a>.
</p>
<div class="figure">
<div class="caption"><h3><a name="prefs">Figure 11: Preferences dialog box</a></h3></div>
<div><img alt="[The view tab is selected in the preferences dialog.]" src="prefs.png"></div>
</div>
<p>
The "Default" menus are used to set the defaults of the
"View" menu and buttons. For instance, uncheck the "Panner"
item under "Menu" and the panner won't be displayed when ds9
is launched. (Note that some options require ds9 to be
restarted before they take effect.)
</p>
<p>
After setting the desired preferences, select "Save". User
preferences are stored in <tt>.ds9.prf</tt>. At startup,
ds9 looks for the preferences file in the following
directory order:
<tt>./</tt>, <tt>$HOME</tt>, <tt>/usr/local/lib</tt>,
<tt>/opt/local/lib</tt>.
</p>
</div>
</div>
<hr size="5" noshade>
<h2><a name="history">History</a></h2>
<table class="history">
<tr>
<td class="historydate">06 Jul 2009</td>
<td>
Original version
</td>
</tr>
</table>
<hr size="5" noshade>
<p>
Return to the <a href="../index.html">DS9 Users Manual</a></p>
</div></body>
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