Thx for the kind comments
I`ll do some greenscreen shoots soon with a (very very bad) costume to try out the possibilities.
In Fact it is quite simple.
1.) Take a picture or a movie (Black&White for best results.. like the original Tron footage)
2.) Use some Programm to make the black lines on the costume transparent
3.) place the color of your choice (red/blue/green for good results) "behind" the Picture/video
4.) Render it (you now got a picture with clorored lines, but no glow) and use a programm like AE or Chromonator (I did this with Chromonator) to key out the green/red/blue
5.) Invert the keying, so that the only things you see are the lines in the color of your choice
6.) blur those lines a little bit and place it ofer the picture/video
7.) Post it to show results to others
Its not a very detailed tutorial, but thats the way it was done. Also I hope you understand what I was writing, because german school english is the best I can do to make myself understood ^^°
Like I said above, the fxhome guy (Tarn) did a very good tutorial which also works for movies.