No thumbnails in your wordpress? Read on…
I noticed last night that my wordpress is not generating thumbnails from uploaded images like it’s suppose to. You’ll noticed that the size options (thumbnail, medium, large) are all disabled except for the full size.
After doing a lot of searching, I finally found out that in order for wordpress to generate thumbnails “by default”, you need to have GD library support for your php. It would have been nice if wordpress had documented that better.
The only reference I found was this:
http://wordpress.org/support/topic/235625
To be clear, wordpress does not generate thumbnails by default unless your php instance has GD support.
Install php gd library
For me, installing GD library was easy:
# yum install php-gd
Check for gd
To check if you have GD loaded in php:
# php -m [PHP Modules] bz2 calendar ctype curl date dbase exif ftp gd gettext gmp hash iconv
Thanks for the tip. Adding the php-gd package to CentOS is a snap.
So, it appears that WordPress creates the various image sizes upon upload; the image size options don’t appear until re-adding them. Is that right?
That’s correct. The various image sizes are generated when you upload. So if you did not have php-gd installed when you uploaded pics the first time, then you will have to re-upload them.
To confirm, you can look in your uploads directory. There should be a file for each size that was generated.
E.g.
viking_full-112×150.jpg
viking_full-225×300.jpg
viking_full.jpg
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Thanks so much, this helped a ton when we moved our WP app between servers and noticed this feature was missing.
And don’t forget to restart Apache to load the new module (d’oh)
Never understood why there wasn’t a “you’ll need this…” info page for wordpress. It is probably intentional based on their other business interests when it comes to wordpress.
I was amazed at all the configs I needed to change to get wordpress working – max upload stuff, installing gd and a bunch of the stuff I probably forgot already.
Yes, thank you so much, that did the trick! I have a self-hosted blog running on a LAMP machine and i couldn’t create any thumbnails. I don’t understand why they don’t mention this solution in the forums.
p.s. if you have already images and you want thumbnails for them you can use the plugin “regenerate thumbnails”.