Create Image Thumbnails with ImageMagick

By  on  

ImageMagick is, for lack of better term, magic.  You can throw just about anything at it and succeed.  With that in mind, I was recently using Google Page Speed to see how I could improve my website and it occurred to me I wasn't generating thumbnails for my post lists -- I was simply scaling down preview images with CSS.  Certainly not the most efficient technique you've ever heard of.  ImageMagick to the rescue -- now I can parse for images and generate thumbnails to make my site much faster to download!

ImageMagick is loaded with options but the syntax to generate a thumbnails is dead easy:

convert billboard.png -trim -resize 32x32 thumbnail.png

Instead of simply scaling down an image with CSS, I should be generating a thumbnail and serving that up instead.  And since it's so easy to do so, there's really no reason not to!

Recent Features

  • By
    6 Things You Didn’t Know About Firefox OS

    Firefox OS is all over the tech news and for good reason:  Mozilla's finally given web developers the platform that they need to create apps the way they've been creating them for years -- with CSS, HTML, and JavaScript.  Firefox OS has been rapidly improving...

  • By
    5 Awesome New Mozilla Technologies You’ve Never Heard Of

    My trip to Mozilla Summit 2013 was incredible.  I've spent so much time focusing on my project that I had lost sight of all of the great work Mozillians were putting out.  MozSummit provided the perfect reminder of how brilliant my colleagues are and how much...

Incredible Demos

Discussion

  1. There is a -thumbnail option to create, you’ve guessed it, thumbnails : http://www.imagemagick.org/script/command-line-options.php#thumbnail

  2. And if you need to do it on the fly, here’s a chainable wrapper for GD (PHP): https://github.com/claviska/SimpleImage

Wrap your code in <pre class="{language}"></pre> tags, link to a GitHub gist, JSFiddle fiddle, or CodePen pen to embed!