Imagecache files not indexed by Google

Does anyone know of a reason why images stored in /imagecache/ would not be indexed by Google?

On our website we have a large number of images that use a gallery and the source of the images is /imagecache/ some of these relate to images/pages on a previous site that have all be 301 redirected. The gallery is search engine friendly so they should have been picked up by Google for display in an image search.

I can't find any images from drupal installs /imagecache/ in Google images so wondering if there is some underlying feature in how the imagecache works that prevents them being indexed.

Any thoughts/help greatly appreciated.

 
 

Drupal is a registered trademark of Dries Buytaert.