<!DOCTYPE html>
<html lang="en">
<head>
<link rel="stylesheet" href="https://unpkg.com/latex.css/style.min.css" />
<link rel="stylesheet" href="/assets/main.css" />
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Converting between image and NumPy array</title>
<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 rel="alternate" href="/feed.rss" type="application/rss+xml" title="Subscribe to Navan Chauhan" />
<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>
<center><nav style="display: block;">
|
<a href="/">home</a> |
<a href="/about/">about/links</a> |
<a href="/posts/">posts</a> |
<a href="/3D-Designs/">3D designs</a> |
<!--<a href="/publications/">publications</a> |-->
<!--<a href="/repo/">iOS repo</a> |-->
<a href="/feed.rss">RSS Feed</a> |
</nav>
</center>
<main>
<h1>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>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>
<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>
<section id="isso-thread">
<noscript>Javascript needs to be activated to view comments.</noscript>
</section>
</main>
<script src="assets/manup.min.js"></script>
<script src="/pwabuilder-sw-register.js"></script>
</body>
</html>