Comments on: Wordpress thumbnail generation disabled

By: More pictures for MT.Net soon « Mark Turner Dot Net

More pictures for MT.Net soon « Mark Turner Dot Net — Thu, 16 Jul 2009 15:08:29 +0000

[...] I just discovered why Wordpress was not resizing my image uploads. It turns out that Wordpress requires the php-gd library to do this, but as this gentleman points out, Wordpress does not document this anywhere. [...]

By: chiao

chiao — Tue, 07 Jul 2009 01:43:02 +0000

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

By: Joseph Lamoree

Joseph Lamoree — Mon, 06 Jul 2009 14:46:24 +0000

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?