An apparatus for generating a video signal, comprising: a linear luminance signal generator to generate a linear luminance signal using linear RGB signals with respect to an input image; a luminance signal converter to convert the linear luminance signal to a non-linear luminance signal (A'); an RGB signal converter to convert the linear RGB signals to non-linear RGB signals; a color difference signal generator; wherein said RGB signal converter is configured to convert a linear G signal of said linear RGB signals into a non-linear G signal (G') and to convert a linear B signal of said linear RGB signals into a non-linear B signal (B'), said color difference signal generator comprising a GB signal convertor configured to generate a non-linear Red-Green color difference signal (C RG ') using the non-linear G signal (G') and the non-linear luminance signal (A') and to generate a non-linear Yellow-Blue color difference signal (C YB ') using the non-linear B signal (B') and the non-linear luminance signal (A'); or wherein said R GB signal converter is alternatively configured to convert a linear R signal of said linear RGB signals into a non-linear R signal (R') and to convert a linear B signal of said linear RGB signals into a non-linear B signal (B'), said color difference signal generator comprising an RB signal convertor configured to generate a non-linear Red-Green color difference signal (C RG ') using the non-linear R signal (R') and the non-linear luminance signal (A') and to generate a non-linear Yellow-Blue color difference signal (C YB ') using the non-linear B signal (B') and the non-linear luminance signal (A'). a linear luminance signal generator to generate a linear luminance signal using linear RGB signals with respect to an input image; a luminance signal converter to convert the linear luminance signal to a non-linear luminance signal (A'); an RGB signal converter to convert the linear RGB signals to non-linear RGB signals; a color difference signal generator; wherein said RGB signal converter is configured to convert a linear G signal of said linear RGB signals into a non-linear G signal (G') and to convert a linear B signal of said linear RGB signals into a non-linear B signal (B'), said color difference signal generator comprising a GB signal convertor configured to generate a non-linear Red-Green color difference signal (C RG ') using the non-linear G signal (G') and the non-linear luminance signal (A') and to generate a non-linear Yellow-Blue color difference signal (C YB ') using the non-linear B signal (B') and the non-linear luminance signal (A'); or wherein said R GB signal converter is alternatively configured to convert a linear R signal of said linear RGB signals into a non-linear R signal (R') and to convert a linear B signal of said linear RGB signals into a non-linear B signal (B'), said color difference signal generator comprising an RB signal convertor configured to generate a non-linear Red-Green color difference signal (C RG ') using the non-linear R signal (R') and the non-linear luminance signal (A') and to generate a non-linear Yellow-Blue color difference signal (C YB ') using the non-linear B signal (B') and the non-linear luminance signal (A').