166 lines
4.4 KiB
HTML
166 lines
4.4 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>ALE User Manual: Default Settings</title>
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<table align=right valign=top width=160>
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<td valign=top height=600 width=160>
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<a href="http://auricle.dyndns.org/ALE/">
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<big>ALE</big>
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<br>
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Image Processing Software
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<br>
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<br>
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<small>Deblurring, Anti-aliasing, and Superresolution.</small></a>
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<br><br>
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<big>
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Local Operation
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</big>
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<hr>
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localhost<br>
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2684415918<br>
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</table>
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<p><b>[ <a href="../">Up</a> ]</b></p>
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<h1>ALE Default Settings</h1>
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<p>ALE offers five different default settings, each of which emphasizes
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image quality, speed, or some other rendering characteristic, as follows:</p>
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<pre>
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--q0 Low quality, high speed. [default]
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--qn Low noise, moderate speed.
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--q1 Moderate quality and speed.
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--q2 High quality, low speed.
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--qr Range-extended high quality.
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</pre>
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<p>These settings specify defaults for other options: <code>--dchain</code>, <code>--achain</code>,
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<code>--mc</code>, <code>--ips</code>, <code>--exp-extend</code>, and <code>--cx</code>. For
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more information about these options, see the <a href="../alignment/">alignment</a> and <a href="../rendering/">rendering</a>
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manual pages. Details regarding these defaults are provided in the following sections.
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<h2>High speed (--q0)</h2>
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<code>--q0</code> emphasizes speed over image quality. This option is default, and
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sets other options' defaults as follows:
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<pre>
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--dchain fine:box:1,triangle:2
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--achain triangle:2
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--mc 30
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--ips 0
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--exp-noextend
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--no-cx
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</pre>
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<h2>Low noise (--qn)</h2>
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<code>--qn</code> emphasizes low noise over resolution and rendering speed, and
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sets the following defaults:
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<pre>
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--dchain sinc*lanc:6
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--achain sinc*lanc:6
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--mc 50
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--ips 0
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--exp-noextend
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--no-cx
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</pre>
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<h2>Balanced quality and speed (--q1)</h2>
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<code>--q1</code> balances image quality and rendering speed, offering higher
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resolution than <code>--qn</code>. In versions 0.8.1 and later, this option
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uses median values, which can be very memory-intensive to calculate. The
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following defaults are used in versions 0.8.1 and later:
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<pre>
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--dchain median:fine:sinc*lanc:8,triangle:2 [0.8.1 and later]
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--achain triangle:2 [0.8.1 and later]
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--mc 50
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--ips 0
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--exp-noextend
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--no-cx
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</pre>
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In 0.8.0, the following defaults are used:
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<pre>
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--dchain fine:sinc*lanc:6,sinc*lanc:6 [0.8.0]
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--achain sinc*lanc:6 [0.8.0]
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--mc 50
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--ips 0
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--exp-noextend
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--no-cx
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</pre>
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<h2>High quality (--q2)</h2>
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<p><code>--q2</code> favors image quality over rendering speed, offering greater
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emphasis for high-frequency details than <code>--q0</code>, <code>--qn</code>,
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or <code>--q1</code>. It depends on the <code>--lpsf</code> and
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<code>--nlpsf</code> options, which can be set indirectly via the
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<code>--device</code> option. (More information about these options can be
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found on the <a href="../rendering/psf">PSF</a> and <a href="../device/">device</a> pages.) <code>--q2</code>
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sets the following defaults:
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<pre>
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--dchain sinc*lanc:8
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--achain sinc*lanc:8
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--no-mc
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--ips 4
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--exp-noextend
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--no-cx
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</pre>
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<h2>Range extension (--qr)</h2>
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<p><code>--qr</code> is similar to <code>--q2</code>, but offers improved
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rendering when input images have been taken with unequal exposures. In other
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cases, it might exacerbate noise in light and dark regions, and so should not
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be used. This option sets the following defaults:
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<pre>
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--dchain sinc*lanc:8
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--achain sinc*lanc:8
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--no-mc
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--ips 6
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--exp-extend
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--cx 0.7
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</pre>
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<br>
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<hr>
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<i>Copyright 2003, 2004 <a href="mailto:dhilvert@auricle.dyndns.org">David Hilvert</a></i>
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<p>Verbatim copying and distribution of this entire article is permitted in any medium, provided this notice is preserved.
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</body>
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</html>
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