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Resolution_Resampler.html
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<h1 class="firstHeading">Resolution Resampler</h1>
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<p>The Resolution Resampler is a built-in tool designed to change the resolution of the script while transforming all affected tags so it ends up looking the same. It can also offset all margins (and absolute positions) by a specific value. Uses include merging two scripts with different resolutions, converting a script for a 4:3 video to its 16:9 equivalent, and converting between 1:1 and anamorphic pixel formats.
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<a name="Overview"></a><h2><span class="editsection">[edit]</span> <span class="mw-headline"> Overview </span></h2>
<center><img alt="Image:Dialog resample.png" longdesc="/docs/Image:Dialog_resample.png" src="./images/Dialog_resample.png" width="264" height="243" /></center>
<p>There are two static boxes in the dialog, "margin offset" and "resolution". The upper box controls how much you want to increase each margin by. The second box indicates the final resolution to which the script is resized.
</p><p>It's important to keep in mind that margin offset happens BEFORE the resolution is changed, so the values are relative to the current script resolution. If you check the "symmetrical" checkbox, then the left and right values will be identical, and the same for top and bottom. Positive values indicate an increase in margin (that is, subtitles farther from the video border), and negative values a decrease.
</p><p>After the margins were offset, the resolution is then resampled to the final value provided. You can click the "From video" button to copy the actual video resolution to the two fields. The "Change aspect ratio" check box indicates whether the horizontal size of subtitles should be affected to conform to the aspect ratio change. This is useful when converting between anamorphic and 1:1 formats.
</p>
<a name="Examples"></a><h2><span class="editsection">[edit]</span> <span class="mw-headline"> Examples </span></h2>
<a name="4:3_SD_to_16:9_HD"></a><h3><span class="editsection">[edit]</span> <span class="mw-headline"> 4:3 SD to 16:9 HD </span></h3>
<p>For example, if you have subtitles typeset to a 640x480 video, and want to apply the same subtitles to a 1280x720 video (which is widescreen, therefore showing more video on the left and right margins), you would set margin left to 107, while leaving top at 0 and "symmetrical" checked. Then you would set final resolution to 1280x720 (leave "Change aspect ratio" unchecked), and hit OK.
</p>
<center><img alt="Image:Resample diagram.png" longdesc="/docs/Image:Resample_diagram.png" src="./images/Resample_diagram.png" width="400" height="300" /></center>
<p>The above 107 value for the left/right margins was obtained with the following formula:
</p>
<pre>(OrigH * FinalW/FinalH - OrigW)/2
</pre>
<p>Which results in:
</p>
<pre>(480 * 1280/720 - 640)/2 = 107
</pre>
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