After my recent update of OS X Lion

Hi I am new to this forum so didn't really know where to post this. I'm looking for some help if someone can tell me what has happened since I brought OS X Lion. I used to be able to change the resolution of my pictures using preview. But since the update I can't any more and need to use it for various things. I have tried using photoshop and Iphoto to do the things i need but just can't get it to do what I want. So if some one can tell me how to get that back that will be great

Pretty sure it's in the same place it's always been.

Preview - Tools - Adjust Size

But you used to be able to change it by clicking on re size or something like that. Then when you opened that up there was a sliding dial that when you moved it shown what then new resolution was. And that's what i need to come back. On Adjust size it doesn't give you this option