[Username1]

The idea is that you don't use the tv circuits to generate a color, because if the source and circuits are not perfect, other colors are produced.

Besides, if the tv can be made to do this without a test signal, and its one of the few setups you can do without one, why would you want to it any other way.

Electronic M pointed out also if the color circuits are not working right using a test dvd will lead to incorrect colors, he is right too.

You guys can do it any way you want, as a tv tech years ago, no one used a test equipment signal to do purity, mostly because the next step is always setting up gray scale, and brightness range. You will be turning screen controls here anyway...

At any rate, good luck with your adjustments, you can do it any way you like and get comfortable with.....