This tutorial will teach you how to add a 3 pixel border to your images and sigs.
To begin, open up an existing image.
Create a new layer and place it on the top in the layers list.
Press CTRL + A to select everything.
Now, go up to Edit > Stroke and use these settings:
Width: 3px
Color: Black
Location: Inside
Now, with everything still selected, go back up to Edit > Stroke.
Change the settings this time:
Width: 2px
Color: (change this to the main color of your image)
Location: Inside
Now, go back up to Edit > Stroke again, and use these settings:
Width: 1px
Color: Black
Location: Inside
That's it, your done!
Here's what I got:
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