On one of my sites if a post's permalink is as follows:
the attachment page for the thumbnail image (i.e. featured image) will be like this:
In other words, the attachment page URL is a repetition of the parent post's URL (sometimes with a '2' slapped on it at the end like in the example).
I want to make the attachment page URLs like this:
I also pass GET parameters to the attachment pages like this:
I want this to become:
The URL duplication is my big concern, the GET translation isn't a priority so long as the parameters aren't lost.