Why is wp_get_attachment_image_src not working with my custom size (add_image_size)

Question

I have added an image size with

add_image_size('gallery-thumb', 48, 48);

Why when I do

array_slice(wp_get_attachment_image_src($firstimg->ID, 'gallery-thumb'))

I get the link to the full sized image?

UPDATE

Somehow it appears that even when I do

wp_get_attachment_image_src($photo->ID, array(48,48))

I get the thumbnail image (150, 150)

scribu · Accepted Answer · 2011-03-09 09:01:41Z

7

Does the 48x48 thumbnail file exist? If not, you can use a plugin like Regenerate Thumbnails.

answered Mar 9, 2011 at 9:01

scribu

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Erik Schoster · Accepted Answer · 2012-03-27 23:37:04Z

I've been wrestling with the same issue this afternoon. The way wordpress handles thumbnails isn't very intuitive, but it seems that:

Thumbnails are only generated on upload. So if you're developing & have added a new size, you'll need to delete and replace your media or regenerate the thumbnails with a plugin (I haven't looked for a native solution - seems ridiculous that there isn't one!) like Scribu suggests in order to use it.
The size parameter seems like it will generate thumbnails of an arbitrary size, but I believe it is actually just mapping to the closest thumbnail size that has already been generated. That's why you're getting 150x150 pixel thumbs back when you request 48x48 pixel thumbs.

2 Answers 2