grrrr.... no point in making a tut for something so easy.\
ok i'll talk you through it.
-grab the rectangular marquee tool (M)
-go up to the bar where it says style, and change it to fixed size (the width and height boxes should open up
-here's where you have to do it yourself. type in the dimensions of your graphic, BUT MAKE SURE YOU PUT "px" NEXT TO THE #'s
-depending on how thick or thin you want the border to be, subtract whatever EVEN # you want from the dimensions (ex: I almost always just subtract 2 from the height and width for a very thin border that is less noticeable but still present.)
-you can play around with it a bit by subtracting different amounts from each side. (for instance: subtract 6 from width and 2 from height. that gives you a thicker border on the sides.)
-after you subtract what you want, click the marquee on a new layer on top of the whole graphic
-then switch to the move tool (V)
-you have to center the dotted selection using the arrows
-after it is centered on the image, invert the selection by hitting CRTL+SHIFT+I, or by going into select>inverse
-now you can fill it with a color that you want by going to edit>fill, or by merely clicking alt+delete for your current color, or ctrl+delete for your second color
-you can then proceede by adding an overlay to the border, which looks good with most colors, leave it like it is, or use any other effects you might like.
That's basically it... I don't know if you have an apple or just windows, but those commands are for windows.
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