I have looked at the guild wars text, in the following picture: Look on the two Ls. Notice how the left L green color is above the right L black frame and simultaneously the right L green color is above the left L black frame. Maybe they draw intialy only the black frame, and on top of it they draw the green letters? How do you think they do it?

funny topic, but I would expect simple blending. Notice the single greenish pixel from the first 'L' which is on the second 'L''s black column. Well, it's a different shade from the second 'L''s corresponding pixel. Hence, each pixel in the charset will have a different alpha value, each char in a string is written to the screen sequentially, blending as specified in the charset.

Just my guess.

That might be it.
However, I have checked the vertical birghter line of each L, and they are the same color.
So the dark frame of the I before the left L, did not affect it.