48 lines
2.3 KiB
HTML
48 lines
2.3 KiB
HTML
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<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>Luminance HDR User Manual — Setting up Luminance HDR — External tools</title>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<link href="style.css" rel="stylesheet" type="text/css" />
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</head>
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<body>
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<h2>External tools</h2>
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<img src="images/prefs-ext.png" width="600" /><br />
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<h3>Alignment options</h3>
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<p>Luminance HDR can optionally use align_image_stack command line tool bundled with Hugin, a panorama stitcher, for the alignment of slightly misaligned images. When several differently exposed images are taken in the process of creating a High Dynamic Range image, the images are not perfectly aligned, and the quality of the HDR image created will suffer from this. align_image_stack uses the tools available to hugin to optimize the roll, pitch and yaw, as well as some parameters of the lens geometry, to align the images.</p>
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<p>align_image_stack doesn't have a lot of relevant options, so we list them here:</p>
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<dl>
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<dt><b>-a prefix</b></dt>
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<dd>Output aligned images as prefix_xxxx.tif</dd>
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<dt><b>-e</b></dt>
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<dd>Assume input images are full frame fish eye (default: rectilinear)</dd>
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<dt><b>-t num</b></dt>
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<dd>Remove all control points with an error higher than num pixels (default: 3)</dd>
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<dt><b>-f HFOV</b></dt>
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<dd>Approximate horizontal field of view of input images, use if EXIF info not complete</dd>
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<dt><b>-m</b></dt>
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<dd>Optimize field of view for all images, except for first. Useful for aligning focus stacks with slightly different magnification.</dd>
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<dt><b>-c num</b></dt>
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<dd>Number of control points (per grid) to create between adjacent images (default: 8)</dd>
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<dt><b>-l</b></dt>
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<dd>Assume linear input files</dd>
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<dt><b>-s scale</b></dt>
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<dd>Scale down image by 2^scale (default: 1 [2x down-sampling])</dd>
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<dt><b>-g gsize</b></dt>
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<dd>Break image into a rectangular grid (gsize x gsize) and attempt to find num control points in each section (default: 5 [5x5 grid])</dd>
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<dt><b>-v</b></dt>
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<dd>Verbose, print progress messages. Repeat for higher verbosity</dd>
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</dl>
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<p>By default Luminance HDR just defines the option for verbose printing <tt>-v</tt>.
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</p>
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</body>
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</html>
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