<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="theme-color" content="#6a9fb5">
<title>Converting between image and NumPy array</title>
<!--
<link rel="stylesheet" href="https://unpkg.com/latex.css/style.min.css" />
-->
<link rel="stylesheet" href="/assets/c-hyde.css">
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Abril+Fatface">
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=PT+Sans:400,400italic,700">
<link rel="stylesheet" href="/assets/main.css">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="og:site_name" content="Navan Chauhan">
<link rel="canonical" href="https://web.navan.dev/posts/2020-01-14-Converting-between-PIL-NumPy.html">
<meta name="twitter:url" content="https://web.navan.dev/posts/2020-01-14-Converting-between-PIL-NumPy.html">
<meta name="og:url" content="https://web.navan.dev/posts/2020-01-14-Converting-between-PIL-NumPy.html">
<meta name="twitter:title" content="Converting between image and NumPy array">
<meta name="og:title" content="Converting between image and NumPy array">
<meta name="description" content="Short code snippet for converting between PIL image and NumPy arrays.">
<meta name="twitter:description" content="Short code snippet for converting between PIL image and NumPy arrays.">
<meta name="og:description" content="Short code snippet for converting between PIL image and NumPy arrays.">
<meta name="twitter:card" content="summary_large_image">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="shortcut icon" href="/images/favicon.png" type="image/png">
<link href="/feed.rss" type="application/atom+xml" rel="alternate" title="Sitewide Atom feed">
<meta name="twitter:image" content="https://web.navan.dev/images/opengraph/posts/2020-01-14-Converting-between-PIL-NumPy.png">
<meta name="og:image" content="https://web.navan.dev/images/opengraph/posts/2020-01-14-Converting-between-PIL-NumPy.png">
<meta name="google-site-verification" content="LVeSZxz-QskhbEjHxOi7-BM5dDxTg53x2TwrjFxfL0k">
<script data-goatcounter="https://navanchauhan.goatcounter.com/count"
async src="//gc.zgo.at/count.js"></script>
<script defer data-domain="web.navan.dev" src="https://plausible.io/js/plausible.js"></script>
<link rel="manifest" href="/manifest.json">
</head>
<body class="theme-base-0d">
<div class="sidebar">
<div class="container sidebar-sticky">
<div class="sidebar-about">
<h1><a href="/">Navan</a></h1>
<p class="lead" id="random-lead">Alea iacta est.</p>
</div>
<ul class="sidebar-nav">
<li><a class="sidebar-nav-item" href="/about/">about/links</a></li>
<li><a class="sidebar-nav-item" href="/posts/">posts</a></li>
<li><a class="sidebar-nav-item" href="/3D-Designs/">3D designs</a></li>
<li><a class="sidebar-nav-item" href="/feed.rss">RSS Feed</a></li>
<li><a class="sidebar-nav-item" href="/colophon/">colophon</a></li>
</ul>
<div class="copyright"><p>© 2019-2024. Navan Chauhan <br> <a href="/feed.rss">RSS</a></p></div>
</div>
</div>
<script>
let phrases = [
"Something Funny", "Veni, vidi, vici", "Alea iacta est", "In vino veritas", "Acta, non verba", "Castigat ridendo mores",
"Cui bono?", "Memento vivere", "अहम् ब्रह्मास्मि", "अनुगच्छतु प्रवाहं", "चरन्मार्गान्विजानाति", "coq de cheval", "我愛啤酒"
];
let new_phrase = phrases[Math.floor(Math.random()*phrases.length)];
let lead = document.getElementById("random-lead");
lead.innerText = new_phrase;
</script>
<div class="content container">
<div class="post">
<h1 id="converting-between-image-and-numpy-array">Converting between image and NumPy array</h1>
<div class="codehilite">
<pre><span></span><code><span class="kn">import</span> <span class="nn">numpy</span>
<span class="kn">import</span> <span class="nn">PIL</span>
<span class="c1"># Convert PIL Image to NumPy array</span>
<span class="n">img</span> <span class="o">=</span> <span class="n">PIL</span><span class="o">.</span><span class="n">Image</span><span class="o">.</span><span class="n">open</span><span class="p">(</span><span class="s2">"foo.jpg"</span><span class="p">)</span>
<span class="n">arr</span> <span class="o">=</span> <span class="n">numpy</span><span class="o">.</span><span class="n">array</span><span class="p">(</span><span class="n">img</span><span class="p">)</span>
<span class="c1"># Convert array to Image</span>
<span class="n">img</span> <span class="o">=</span> <span class="n">PIL</span><span class="o">.</span><span class="n">Image</span><span class="o">.</span><span class="n">fromarray</span><span class="p">(</span><span class="n">arr</span><span class="p">)</span>
</code></pre>
</div>
<h2 id="saving-an-image">Saving an Image</h2>
<div class="codehilite">
<pre><span></span><code><span class="k">try</span><span class="p">:</span>
<span class="n">img</span><span class="o">.</span><span class="n">save</span><span class="p">(</span><span class="n">destination</span><span class="p">,</span> <span class="s2">"JPEG"</span><span class="p">,</span> <span class="n">quality</span><span class="o">=</span><span class="mi">80</span><span class="p">,</span> <span class="n">optimize</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">progressive</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">IOError</span><span class="p">:</span>
<span class="n">PIL</span><span class="o">.</span><span class="n">ImageFile</span><span class="o">.</span><span class="n">MAXBLOCK</span> <span class="o">=</span> <span class="n">img</span><span class="o">.</span><span class="n">size</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">*</span> <span class="n">img</span><span class="o">.</span><span class="n">size</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span>
<span class="n">img</span><span class="o">.</span><span class="n">save</span><span class="p">(</span><span class="n">destination</span><span class="p">,</span> <span class="s2">"JPEG"</span><span class="p">,</span> <span class="n">quality</span><span class="o">=</span><span class="mi">80</span><span class="p">,</span> <span class="n">optimize</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">progressive</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
</code></pre>
</div>
</div>
<blockquote>If you have scrolled this far, consider subscribing to my mailing list <a href="https://listmonk.navan.dev/subscription/form">here.</a> You can subscribe to either a specific type of post you are interested in, or subscribe to everything with the "Everything" list.</blockquote>
<script data-isso="https://comments.navan.dev/"
src="https://comments.navan.dev/js/embed.min.js"></script>
<div id="isso-thread">
<noscript>Javascript needs to be activated to view comments.</noscript>
</div>
</div>
<script src="assets/manup.min.js"></script>
<script src="/pwabuilder-sw-register.js"></script>
</body>
</html>