Bilinear filtering is a texture filtering method used to smooth textures when displayed larger or smaller than they actually are. Colour spacing was introduced on later psp models. It had to do with the view. Wide was the preferred choice as the colours ooked better; less washed out. " Enabling this function makes the color space of your PS Vita system more like that of a liquid crystal screen, so you can enjoy more original color " "The screen of your PS Vita system uses organic EL technology, so its color space differs from the color space of the PSP™ system, which uses a liquid crystal screen" "With some games, the effect of this function might be hard to see even when this function is enabled, and the colors might not be to your liking. In this case, disable this function " basically it seems it only makes a difference if running psp games on your Vita.