imgcompress.html


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<!DOCTYPE html>
<html lang=en>
	<head>
		<title>Image compression &ndash; LandChad.net</title>
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		<header><h1>Image compression</h1></header>
		<nav></nav>
		<main>
			<p>
			Image files will usually have the most impact on the
			speed of your websites (aside from Ad/tracker scripts).
			Learn to slim down your images using the ubiquitous
			<em>ImageMagick</em> to make your websites faster on
			slow internet connections.
			</p>
			<img src="pix/imgcompress-network.png" alt="Image network speed">
			<p>
			For the examples, I decided to use
			<a href="https://commons.wikimedia.org/wiki/File:Tabby_cat_with_blue_eyes-3336579.jpg">this</a>
			public domain image.
			</p>
			<img src="pix/imgcompress-cat.png" style="width: 50%;" alt="Compressed image of a cat">
			<p> There are many ways to decrease image size using
			ImageMagick, the simplest is to use the
			<code>-quality</code> option, which will compress the
			image without changing the resolution. This option
			takes the value you want to compress by (between 1 and
			100, the lower the value, the lower the file size). For
			example:</p>
			<pre><code>convert in.jpg -quality 50 out.jpg</code></pre>
			<p>
			Compressing the example image above results in the
			following file size changes:
			</p>
			<center>
				<table style="border: solid;">
					<tr><th>Quality</th><th>Size</th></tr>
					<tr><td>Original</td><td>2.1M</td></tr>
					<tr><td>90</td><td>1.7M</td></tr>
					<tr><td>80</td><td>844K</td></tr>
					<tr><td>70</td><td>588K</td></tr>
					<tr><td>60</td><td>448K</td></tr>
					<tr><td>50</td><td>368K</td></tr>
					<tr><td>40</td><td>308K</td></tr>
					<tr><td>30</td><td>248K</td></tr>
					<tr><td>20</td><td>184K</td></tr>
					<tr><td>10</td><td>116K</td></tr>
				</table>
			</center>
			<p>
			Due to the images high resolution, it is usable in this
			website even when highly compressed (30% quality, still
			looks decent in my opinion).
			</p>
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