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<h1 id="firstHeading" class="firstHeading">Hugin Preferences</h1>
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<a name="General" id="General"></a><h1> <span class="mw-headline"> General </span></h1>
<a name="Resource_usage" id="Resource_usage"></a><h2> <span class="mw-headline"> Resource usage </span></h2>
<p>To speed things up <a href="Hugin.html" title="Hugin">hugin</a> keeps a copy in memory of as many input photos as possible. With very large projects, this would use all your system memory, so set <b>Image cache memory</b> to a value below your available free RAM. The default of 200MB should be ok for a system with 512MB of RAM.
</p><p>The <a href="Hugin_Preview_window.html" title="Hugin Preview window">hugin Preview window</a> is multi-threaded so can use more than one CPU/core if required. Set <b>Number of CPUs</b> to how many CPUs you wish to use.
</p>
<a name="User_interface" id="User_interface"></a><h2> <span class="mw-headline"> User interface </span></h2>
<p>Usually, <a href="Hugin.html" title="Hugin">hugin</a> will use the current locale to determine the language of buttons, menus etc...
Set the <b>Language</b> if you need to switch languages temporarily or if you are using a platform
such as Windows95 that doesn't support localised software. hugin won't change language
immediately, you will need to stop and restart it.
</p>
<a name="File_options" id="File_options"></a><h2> <span class="mw-headline"> File options </span></h2>
<p>Some <a href="Hugin.html" title="Hugin">hugin</a> actions generate large temporary files, change the <b>Tempdir</b> to
specify an alternative location for writing these files. One reason for setting this
independently from the operating system would be to use a RAM disk to speed up
stitching.
</p><p><br />
</p>
<a name="Assistant" id="Assistant"></a><h1> <span class="mw-headline"> Assistant </span></h1>
<p>The <a href="Hugin_Assistant_tab.html" title="Hugin Assistant tab">Hugin Assistant tab</a> automates the entire panorama creation process, these
settings allow you to customise the assistant.
</p>
<a name="Image_loading" id="Image_loading"></a><h2> <span class="mw-headline"> Image loading </span></h2>
<p>Select <b>Automatically align images after loading</b> to run the second <b>Align...</b>
step immediately after loading the images.
</p>
<a name="Auto_align" id="Auto_align"></a><h2> <span class="mw-headline"> Auto align </span></h2>
<p>Auto align uses <a href="Autopano-sift.html" title="Autopano-sift">autopano-sift</a> or <a href="Autopano.html" title="Autopano">autopano</a> to generate <a href="Control_points.html" title="Control points">control points</a>
between pairs of images, set <b>Number of Ctrl Points per overlap</b> to control
the number of control points. Note that although most pictures can be stitched
with just three or four control points, automatically generated points tend not
to be very evenly distributed, so this number should be set to ten or more
</p><p>The size of the output <b>Panorama Image Size</b> is usually set in the
<a href="Hugin_Stitcher_tab.html" title="Hugin Stitcher tab">Hugin Stitcher tab</a> where it is also possible to <b>Calculate Optimal Size</b>
based on the sizes of the input images. The <b>Auto align</b> process
does something similar, though here you can set a smaller output as a percentage.
Generally setting a percentage of 70% leads to no great loss of quality due to
the way a camera <a href="CCD.html" title="CCD">CCD</a> samples data.
</p><p><br style="clear:both;" />
</p>
<a name="Control_Points_Editor" id="Control_Points_Editor"></a><h1> <span class="mw-headline"> Control Points Editor </span></h1>
<a name="HDR_and_16bit_display_mode" id="HDR_and_16bit_display_mode"></a><h2> <span class="mw-headline"> HDR and 16bit display mode </span></h2>
<p><a href="Hugin.html" title="Hugin">hugin</a> supports both <a href="HDR.html" title="HDR">HDR</a> and 16bit imaging. These image formats
contain a lot more brightness and colour information than can be displayed
on a standard computer monitor, so hugin only shows a rough representation
of these pictures.
</p><p>16bit data can have <i>linear</i> or <i>corrected</i> <a href="Gamma.html" title="Gamma">gamma</a>. Linear images
appear very dark on many monitors, so set the <b>Curve</b> to <b>gamma 2.2</b>.
</p><p>For HDR data, try setting the <b>Curve</b>
to <b>logarithmic</b>.
</p><p>Changes to the <b>HDR and 16bit display mode</b> require restarting hugin to
take effect.
</p>
<a name="Finetune" id="Finetune"></a><h2> <span class="mw-headline"> Finetune </span></h2>
<p><a href="Hugin.html" title="Hugin">hugin</a> helps position <a href="Control_points.html" title="Control points">control points</a> to within a fraction of a pixel distance automatically:
</p>
<ul><li> When <b>auto fine-tune</b> is selected in the <a href="Hugin_Control_Points_tab.html" title="Hugin Control Points tab">hugin Control Points tab</a> while picking control points.
</li><li> When clicking <b>Fine-tune</b> in the <a href="Hugin_Control_Points_tab.html" title="Hugin Control Points tab">hugin Control Points tab</a>
</li><li> When picking <b>Fine-tune all Points</b> in the <a href="Hugin_Main_window.html" title="Hugin Main window">hugin Main window</a> <b>Edit</b> menu.
</li></ul>
<ul><li> <b>Patch width</b>, the size of the square of pixels taken from the left photo to match with the right photo when picking <a href="Control_points.html" title="Control points">control points</a>, reduce if this is taking a long time on your system.
</li><li> <b>Search area width</b>, the percentage area of the right photo that is searched when picking <b>control points</b>, reduce if this is taking a long time on your system.
</li><li> <b>Local search area width</b>, the region of the right photo searched when you click <b>Fine-tune</b> in the <a href="Hugin_Control_Points_tab.html" title="Hugin Control Points tab">hugin Control Points tab</a> or <b>Fine-tune all Points</b> in the <a href="Hugin_Main_window.html" title="Hugin Main window">hugin Main window</a> <b>Edit</b> menu.
</li><li> <b>Correlation Threshold</b>. For each <b>Fine-tune</b>, <a href="Hugin.html" title="Hugin">hugin</a> calculates the quality of the <b>control points</b> match, raise this threshold to reject dubious matches.
</li><li> <b>Peak Curvature Threshold</b>, Currently unused.
</li></ul>
<a name="Rotation_search" id="Rotation_search"></a><h2> <span class="mw-headline"> Rotation search </span></h2>
<p>Enable this if your photos:
</p>
<ul><li> have a very wide angle <a href="Field_of_View.html" title="Field of View">Field of View</a> or <a href="Fisheye_Projection.html" title="Fisheye Projection">fisheye Projection</a>.
</li><li> are tilted up or down, <a href="Control_points.html" title="Control points">control points</a> near the <a href="Zenith.html" title="Zenith">zenith</a> or <a href="Nadir.html" title="Nadir">nadir</a> may need to have full 360 degree rotation search
</li></ul>
<p><br style="clear:both;" />
</p>
<a name="Autopano" id="Autopano"></a><h1> <span class="mw-headline"> Autopano </span></h1>
<p><a href="Hugin.html" title="Hugin">hugin</a> uses an external tool for automatically creating <a href="Control_points.html" title="Control points">control points</a> for a set of images either when:
</p>
<ul><li> clicking <b>2. Align...</b> in the <a href="Hugin_Assistant_tab.html" title="Hugin Assistant tab">hugin Assistant tab</a>.
</li><li> or clicking <b>Create control points</b> in the <a href="Hugin_Images_tab.html" title="Hugin Images tab">hugin Images tab</a>.
</li></ul>
<p>Set the pull down menu to use the default configuration for one of these external tools:
</p>
<ul><li> <a href="Autopano.html" title="Autopano">Autopano</a> (by A. Jenny), closed source, available for Linux i386 and Windows 32bit.
</li><li> <a href="Autopano-sift.html" title="Autopano-sift">Autopano-SIFT</a> (by S. Nowozin), open source, available for Linux, Windows and OS X.
</li></ul>
<p>Parameters for these tools can be customised or even switched to another similar tool (such as <a href="Autopano-sift-C.html" title="Autopano-sift-C">autopano-sift-C</a>) in the remaining section. Typical tweaks might be to:
</p>
<ul><li> Set <i>--noransac</i> for <a href="Autopano-sift.html" title="Autopano-sift">autopano-sift</a> when using non-<a href="Rectilinear_Projection.html" title="Rectilinear Projection">rectilinear Projection</a> input images.
</li><li> Set <i>--size</i> for <a href="Autopano-sift.html" title="Autopano-sift">autopano-sift</a> which by default downsizes images to 700 pixels before matching.
</li></ul>
<a name="Enblend" id="Enblend"></a><h1> <span class="mw-headline"> Enblend </span></h1>
<p>In the final stitching process <a href="Nona.html" title="Nona">nona</a> reprojects and distorts images to fit, <a href="Enblend.html" title="Enblend">enblend</a> takes these
images as individual <a href="TIFF.html" title="TIFF">TIFF</a> files and merges them using sophisticated seam positioning and blending into
a single finished TIFF file.
</p><p>The <b>Use alternative Enblend program</b> option allows you to use other tools with a similar interface
such as smartblend or enblend-mask.
</p><p>enblend supports a range of <b>Additional arguments</b>, for example you may want to set:
</p>
<ul><li> <b>-a</b> Pre-assemble non-overlapping images to speed up blending. This is generally useful, but will slow blending in rare cases.
</li><li> <b>-l number</b> Number of levels to use (1 to 29), larger numbers result in wider seams. E.g. setting 1 will result in a 2 pixel wide blend, 8 will result in a 256 pixel wide blend and you are extremely unlikely to want a blend level as high as 16.
</li><li> <b>-z</b> Use LZW compression. The <a href="TIFF.html" title="TIFF">TIFF</a> file format has a 2GiB limit (or 4GiB or 8GiB, depending on who you ask) so you will find this useful for large panoramas.
</li><li> <b>-b kilobytes</b> Image cache block size (default=2MiB)
</li><li> <b>-c</b> Use CIECAM02 to blend colors. Your input images need to have embedded <a href="Colour_profile.html" title="Colour profile">colour profiles</a> for this to work.
</li><li> <b>-m megabytes</b> Use this much memory before going to disk (default=1GiB). Increase if you have a lot of memory on your system.
</li><li> <b>--fine-mask</b> Enables detailed mask generation.
</li><li> <b>--no-optimize</b> Turn off mask optimization.
</li></ul>
<p>Note that setting <b>Additional arguments</b> here will only effect new projects, to change <a href="Enblend.html" title="Enblend">enblend</a> and <a href="Enfuse.html" title="Enfuse">enfuse</a> settings for the current project use the <a href="Hugin_Stitcher_tab.html" title="Hugin Stitcher tab">hugin Stitcher tab</a>.
</p>
<a name="Enfuse" id="Enfuse"></a><h1> <span class="mw-headline"> Enfuse </span></h1>
<p>If <b>Exposure Blending</b> is selected in the <a href="Hugin_Stitcher_tab.html" title="Hugin Stitcher tab">hugin Stitcher tab</a> then <a href="Enfuse.html" title="Enfuse">enfuse</a> will be used to merge bracketed exposures during stitching.
</p>
<a name="Celeste" id="Celeste"></a><h1> <span class="mw-headline"> Celeste </span></h1>
<p>Often a project has many control points attached to clouds in the sky, this is usually unwanted as clouds move between photos. <a href="Using_Celeste_with_hugin.html" title="Using Celeste with hugin">celeste</a> will attempt to identify 'sky' control points and delete them.
</p><p><br style="clear:both;" />
</p>
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