Ah... I see. I didn't make myself clear. You have enlarged the black letter layer, and that's not what I meant. The process I used to create the black outline round the word "Crossdresser" in the title of this cover
1. Type the title text on a transparent layer.
2. Duplicate the title layer, and select the "lower" of the two layers as the active one for editing.
3. Select the actual text
to create an edit mask. I use GIMP's Select By Color
function to do this.
4. Enlarge the selection
by one or two pixels. This will enlarge into the "holes" in letters as well as round the outside.
5. Fill the selection
with your outline colour.
6. Clear your selection.
7. Apply any filters you want to your two text layers.
8. Merge the "upper" text layer down onto the lower (optional).
9. Sit back and admire your work.
I hope this is a bit clearer. It's one of those things that would take five minutes to demonstrate, but is difficult to describe. Unfortunately I don't know Paintshop Pro, so I can't give detailed steps.