1. A method for adjusting a color saturation level of at least one color pixel of an input image obtained from a time varying RGB video signal, comprising: employing an RGB color processor for decomposing an RGB color sample representing the at least one color pixel into color tone information including a color tone vector having a direction representative of the hue of the color sample and a magnitude representative of the saturation of the color sample; determining a saturation adjusted color tone based on the color tone vector and a saturation adjustment parameter; and determining a saturation adjusted RGB color sample based on the saturation adjusted color tone.