109 lines
2.9 KiB
XML
109 lines
2.9 KiB
XML
<?xml version="1.0"?>
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<!DOCTYPE book PUBLIC "-//Norman Walsh//DTD DocBk XML V3.1.4//EN"
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"file:///usr/share/xml/docbook/schema/dtd/4.4/docbookx.dtd">
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<chapter id="user-defaults">
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<title>Default Settings</title>
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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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<ll>--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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</ll>
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<p>These settings specify defaults for other options: <l>--dchain</l>,
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<l>--achain</l>, <l>--3d-chain</l>, <l>--ips</l>, <l>--exp-extend</l>, and
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<l>--cx</l>. For more information about these options, see <xref
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linkend="user-rendering"/> and <xref linkend="user-3d"/>. Details regarding
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these defaults are provided in the following sections.</p>
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<s><t>High speed (--q0)</t>
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<p><code>--q0</code> emphasizes speed over image quality. This option is default, and
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sets other options' defaults as follows:</p>
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<ll>--dchain fine:box:1,triangle:2
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--achain triangle:2
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--ips 0
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--exp-noextend
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--no-cx
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--3d-chain fine:box:1,triangle:2
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</ll>
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</s>
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<s><t>Low noise (--qn)</t>
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<p><code>--qn</code> emphasizes low noise over resolution and rendering speed, and
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sets the following defaults:</p>
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<ll>--dchain sinc*lanc:6
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--achain sinc*lanc:6
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--ips 0
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--exp-noextend
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--no-cx
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--3d-chain sinc*lanc:6
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</ll>
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</s>
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<s><t>Balanced quality and speed (--q1)</t>
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<p><code>--q1</code> balances image quality and rendering speed, offering higher
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resolution than <code>--qn</code>. As this option uses median values, its memory use
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is linear in the number of input images (rather than constant).</p>
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<ll>--dchain median:fine:sinc*lanc:8,triangle:2
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--achain triangle:2
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--ips 0
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--exp-noextend
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--no-cx
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--3d-chain median:fine:sinc*lanc:8,triangle:2
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</ll>
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</s>
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<s><t>High quality (--q2)</t>
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<p><l>--q2</l> favors image quality over rendering speed, offering greater
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emphasis for high-frequency details than <l>--q0</l>, <l>--qn</l>,
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or <l>--q1</l>. It depends on the <l>--lpsf</l> and
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<l>--nlpsf</l> options, which can be set indirectly via the
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<l>--device</l> option. (More information about these options can be
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found in <xref linkend="user-psf"/> and <xref linkend="user-device"/>.) <l>--q2</l>
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sets the following defaults:</p>
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<ll>--dchain triangle:2
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--achain triangle:2
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--ips 4
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--exp-noextend
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--no-cx
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--3d-chain median:fine:sinc*lanc:8,triangle:2
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</ll>
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</s>
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<s><t>Range extension (--qr)</t>
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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 may exacerbate noise in light and dark regions. This option sets the
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following defaults:</p>
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<ll>--dchain triangle:2
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--achain triangle:2
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--ips 6
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--exp-extend
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--cx 0.7
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--3d-chain median:fine:sinc*lanc:8,triangle:2
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</ll>
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</s>
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</chapter>
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