Try this.
step 1.Open image
step 2. Image>Canvas Size and click on the box that says "relative"
Make sure the pull down menu for width and height iis set to "pixels" and the "canvas extention color" is set to "white. Then put in the pixel size of the white line to border the image.Then click OK.
step 3. Repeat 2
Only this time choose either inches or pixels to make the larger black border by setting the "canvas extention color" to "black" then click "ok."
to add a shadow (second attached image): make sure you are not on the "background" layer. If you are double click on the layer and call it something else.
Image>Canvas Size - this time make sure the "relative" box is not checked and increase the size of your canvas so you have room for the shadow. In your layers pallet "apple click" (on a mac, I think alt click on pc) on your layer to select the image and then choose drop shadow from the "add a layer style" menu at the bottom of the layer's palet.
Hope this helps.
~Nancy~
also you can add a very light g blur to the white border to soften it if desired.
_____________________________
www.PhotoArt123.com