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add use of ratio to -extent #80

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Nov 17, 2021
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add use of ratio to -extent #80

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11 changes: 10 additions & 1 deletion include/command-line-options.php
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Expand Up @@ -2964,14 +2964,23 @@ function (its frequency), and thus determines the number of 'waves' that will
specify how to compose the image with the background, use <a href="#compose"
>-compose</a>.</p>

<p>This command reduces or expands a JPEG image to fit on an 800x600
<p>The following command reduces or expands a JPEG image to fit on an 800x600
display. If the aspect ratio of the input image isn't exactly 4:3, then the
image is centered on an 800x600 black canvas: </p>

<ul><pre class="bg-light text-dark"><samp>magick input.jpg -resize 800x600 -background black -compose Copy \
-gravity center -extent 800x600 -quality 92 output.jpg
</samp></pre></ul>

<p>The command can also be used with a ratio. If the image is not already at that ratio,
it will be cropped to fit it. The <a href="#gravity">-gravity</a> setting has
the expected effects.

<p>The following command crops a JPEG image so that it has a 4:3 ratio:</p>

<ul><pre class="bg-light text-dark"><samp>magick input.jpg -extent 4:3 -quality 92 output.jpg
</samp></pre></ul>

<p><?php seeGeometry(); ?></p>

<div style="margin: auto;">
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