40 lines
1.6 KiB
XML
40 lines
1.6 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-exclusion"><title>Exclusion Regions</title>
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<p>ALE offers exclusion regions as a way to disallow certain areas from being
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used in alignment and (optionally) rendering. Spatial coordinates are
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expressed in the rendering coordinate system (prior to scaling). In cases
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where the default transformation is used with the original frame, this is
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identical to the unscaled original frame coordinate system, taking the
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upper-left corner to be (0, 0). Frame numbering begins with 0, which represents
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the original frame.</p>
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<s><t>Rectangular Exclusion</t>
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<p>All specified volumes are excluded from alignment (except where they affect
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the alignment reference image), and are excluded from rendering by default.
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(See <xref linkend="user-chains"/> for information on how to ignore exclusion
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regions.) Exclusion region syntax is as follows:</p>
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<ll>--ex <args> Exclude a specified volume.
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<args> are space-delimited horizontal,
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vertical, and frame limits:
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<xmin> <xmax> <ymin> <ymax> <fmin> <fmax>
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</ll>
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</s><s><t>Cropping</t>
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<p>Cropping excludes the spatial complement of an area over a specified set of
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frames.</p>
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<ll>--crop <args> Exclude the spatial complement of an area over a
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specified set of frames. <args> are:
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<xmin> <xmax> <ymin> <ymax> <fmin> <fmax>
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</ll>
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</s>
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</chapter>
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