White outline around screenshots and pictures? How can I remove?

[Doju]

Whenever I take a screenshot, OS X insists on putting a pretty white square around the thumbnail. But after I edit the photo (say, in Photoshop) it comes out without the white square (see image below).

How can I make this permanent? The white square is annoying me.

(In the below example, I'd like all the thumbnails to look like "House.png".

 

[BlueRevolution]

And I thought I was OCD...

You can't. Just live with it. Adobe is setting a custom file icon, while the white-bordered image are previews in Finder.

 

[Buzz Bumble]

I guess you could set-up an AppleScript / Automater application that watches a particular folder or searches for certin filenames and tells Photoshop to open the file and re-save it.