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When I upload an image through the admin interface, the image is only saved at full-size. The other sizes are configured to their default values in Settings > Media. The automatic resized versions are not being generated. I have a feeling this is due to not having a specific PHP extension installed/enabled, but I don't know what extension WordPress uses or how to install/enable it.

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From https://make.wordpress.org/core/2012/12/06/wp_image_editor-is-incoming/ :

Imagick support requires Imagick 2.2.0+ compiled against Imagemagick 6.2.9+, for full support. If the required functions aren’t available, WordPress will default back to GD.

If you can, create a PHP file somewhere on your server with this content: <?php phpinfo(); ?>. Then load the page and see if there is a section for either imagick or gd.

From mine:

gd
GD Support  enabled
GD Version  bundled (2.0.34 compatible) 
etc.

(It's probably best if you delete or disable your <?php phpinfo(); ?> file afterwards, as it may supply plenty of valuable information to potential attackers.)

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  • Neither of them appear to be installed. I've tried installing both of them, but I obviously don't know what I'm doing. yum install php-gd always fails because I have a newer version of one of the dependencies. I think I successfully installed ImageMagick, but I don't know how to enable it. – raddevon Apr 17 '13 at 19:34
  • Unfortunately I don't have any experience with yum. You might have to ask around on serverfault.com or superuser.com or somewhere like that. – Pat J Apr 17 '13 at 19:45
  • I found a solution to this. I'm writing up a blog post about my solution, and I'll be back here to post the answer after I collect my thoughts and write that up. – raddevon Apr 18 '13 at 18:35
  • For ubuntu I had to do: sudo apt-get install imagemagick php5-gd and then restart the web server – timhc22 May 2 '15 at 16:52
1

The solution turned out to be avoiding php-gd altogether as I couldn't get it installed. Instead, I installed the ImageMagick Engine WordPress plugin as well as ImageMagick on the server. Then I regenerated image sizes using the plugin to create the additional sizes for images I had already uploaded.

I posted the solution on my blog if you want more detail. https://raddevon.com/articles/wordpress-image-resizing-without-php-gd/

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  • 1
    Blog link broken – Jack Feb 12 '16 at 15:06
  • Link only answers are not appreciated in here, I guess... Please provide the solution in your answer... – Krzysiek Dróżdż Jul 19 '18 at 6:48

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