Open up Paint.Net, and delete the image and delete the starting 800x600 image.
Open a new image with dimensions 500x200 and make your sig background.
Use canvas size. Resize it to 800x400, and use magic wand to make the outside background transparent. It should look like this:
(HELPFUL TIP): If it makes a part of the sig a part of the outside background while using magic wand, make a very small border on the sig background by using Rectangle.
Open your render. The background of the render has to be transparent. If you are trying to make a background of a render transparent, use Grim Color Reaper, or use magic wand and use AA's Assistant to remove the lines. I prefer Grim Color Reaper though, because it works better.
Open a new layer. Go to properties and name this: Render.
Copy and paste the render on the sig on the Render layer. After your done that, you can edit the sig. I made a shadow.
This dosen't only apply for signatures, though. It can be made for anything, although I prefer signatures better. The size has to change though. When using Canvas Size, I just did +200 to both width and length. Though this kind of signature does not apply with signature rules here, it can still be used somewhere else.
Edited by Kero, 09 March 2013 - 05:13 PM.