@animemaakuo: There are references for greyscale and color which are used by the film studios to master the discs. If you really want to see everything exactly the way it was mastered, there's a good guide that I learned from: http://www.curtpalme.com/forum/viewtopic.php?t=10457

If you only want a basic setup of your TV, you can buy Digital video essentials and you'll be able to set brightness, contrast and color/saturation correctly.

Then there's always the usual advice: Set color temp to the warmest setting, turn off all dynamic contrast, edge enhancement, noise reduction, sharpness, wide color gamut etc.