How to change title format for attachment post url's

Hi i hope someone can help.

I run 3 wordpress sites but only seem to be having this problem with one of them.

On my blog posts i feature the wordpress gallery, images link to attachment post url’s where i provide more info about the image.

the url and the title displayed are fine but in google search results the title format that appears is the blog post title and blog name. I would like the image title and blog name.

I use attachment post url’s on another wordpress site which runs a slightly older version of wordpress and the title format is correctly using the image title and blog name.

How can i change the title format for attachment post url’s? I am no good with code so i’m hoping there is either a plugin or settings somewhere on wordpress.

I use all in one seo pack and that offers many option for title formats but not for attachment post url’s.

Any help is much appreciated as I really don’t want 30 pages all with the same titles.

thanks.