I have a strip of world flags, which I got hold of a few years ago. They were all separate and I needed them in a long strip, so I painstakingly stuck them all together in paint.net. The problem is, as time has gone on, I need to update a couple of the flags, e.g Libya (has a new flag) and Northern Ireland (didn't have a flag in the set, so I just used the English flag).
Now I can easily get hold of the new flags and just paste them over the old one, but there are a couple of minor effects on the existing flag set that I don't know how to replicate. Here are two flags to show the old set and my newly pasted flag.
https://dl.dropboxusercontent.com/u/112519761/2flags.png
As you can see, the North Korean flag on the left has some sort of fading, going from lighter at the top to darker at the bottom. I've tried messing around with gradients but I can't really replicate it properly. It also has a single-pixel light square around the edge of the flag which mine doesn't. Again, I don't know how to replicate this.
I'm not asking for someone to do it for me, because I need to update the Libya flag too and as flags change over the years, I'd like to know how to do this myself. Could anyone give me a few pointers on how I achieve these two effects on my flags?