It looks to me what OCP has done is just raise the gamma settings without adjusting the input black & white levels. Using just the gamma setting will bring out all the noise in the darker & some other areas. I came across this problem when i was first attempting to colour correct ANH. But i found that you only need to raise the gamma very slightly and then use the input white level to brighten without bringing out too much noise. Here's an comparison example. Here you can see that i have managed to brighten up the image without bringing out too much noise in the darker areas and is almost as bright as OCP's. i boosted the saturation on my image just to match OCP's just for this example. The original of mine has had the saturation dropped by about 20%

http://img374.imageshack.us/img374/8455/comparisonvl4.jpg

I find it is always best to do some quick renders first onto a dvd-rw and check on a few tv's to see if any problems have occured with brightening & colour correction. The problem with the 2004 DVD's is that the detail has been lost in the black areas and no amount of brightening will fix this. Its all just finding a good balance between brightness & minimal image noise.