Controling colors in Konsole

Guys, I have a question that is not exactly Trinity related, but I think you might know how to solve my problem. I do most of my work in Konsole + Emacs. Terminal by default supports 8 colors and if I stick with that everything is fine. Now I'd like to have more colors. First I set TERM=xterm-256color in my .bashrc. Emacs sees that 256 colors are available (as listed with M-x list-colors-display). Then I install color-theme for Emacs and try selecting themes that are available. Most of them are completely unusable, which leads me to conclusion that Konsole somehow distorts tho original colors intended by theme authors. My question is about interaction between Konsole, TERM value and the way Emacs sees colors. In Konsole I can customize 20 different colors - how do they influence 256 colors of the terminal? I noticed that the color set I choose in Konsole influences the color theme in Emacs - again, how does this interact? At the moment colors I get are completely random and it would be good to have some control over it. Janek