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<?xml version="1.0"?>
<!DOCTYPE book PUBLIC "-//Norman Walsh//DTD DocBk XML V3.1.4//EN"
"file:///usr/share/xml/docbook/schema/dtd/4.4/docbookx.dtd">
<chapter id="user-device"><title>Devices</title>
<p>Device specification is optional. Specifying a device allows automatic
determination of <a href="../rendering/psf/">point-spread functions</a>,
refinement of the correspondence between incident light and pixel values (e.g.
power law), and refinement of certainty calculation.</p>
<pre>--device <d> Set the capture device to <d>.
</pre>
<p>Available devices are as follows:</p>
<table>
<caption>Available device types</caption>
<tr><td>canon_300d_raw_linear</td><td>Canon 300D (Digital Rebel) raw, linear data.</td></tr>
<tr><td>canon_300d_raw_linear+50mm_1.4</td><td>Canon 300D with EF 50mm f/1.4 lens, unspecified aperture.</td></tr>
<tr><td>canon_300d_raw_linear+50mm_1.4@1.4</td><td>Canon 300D with EF 50mm f/1.4 lens, aperture 1.4.</td></tr>
<tr><td>canon_300d_raw_linear+50mm_1.8</td><td>Canon 300D with EF 50mm f/1.8 lens, unspecified aperture.</td></tr>
<tr><td>canon_300d_raw_linear+85mm_1.8</td><td>Canon 300D with EF 85mm f/1.8 lens, unspecified aperture.</td></tr>
<tr><td>ov7620_raw_linear</td><td>OmniView OV7620 in raw RGB, linear mode.</td></tr>
<tr><td>xvp610_640x480</td><td>IBM PC Camera Pro (XVP610) in 640x480 mode.</td></tr>
<tr><td>xvp610_320x240</td><td>IBM PC Camera Pro (XVP610) in 320x240 mode.</td></tr>
</table>
<p>These device options are described in more detail below.</p>
<s><t>Canon 300D (Digital Rebel)</t>
<p>Direct support for CRW files depends on the ImageMagick configuration, and
may not be available on all platforms. Dave Coffin's <a
href="http://www.cybercom.net/~dcoffin/dcraw/">dcraw</a> program, invoked with
arguments -d -4, will produce a raw, linear PPM file suitable for use with this
device configuration. JPEG files produced by the 300D cannot be directly used
as inputs for this configuration, since they are gamma-corrected rather than
linear.</p>
</s><s><t>OV7620</t>
<p>Standard OV7620 drivers may not include options for setting raw RGB or linear
modes. Linux users may apply a <a href="/ov7620/">driver patch</a> to access
these modes. Setting the module option <code>rgb_raw=2</code> places the camera
into the desired mode.</p>
</s><s><t>XVP610</t>
<p>Users of XVP610 cameras and Linux may wish to apply a <a href="/xvp610/">driver patch</a>. This version of ALE expects that this patch has been applied.</p>
</s>
</chapter>
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