METHOD AND CIRCUIT FOR MAKING PSEUDO COLOR

PURPOSE:To obtain a color picture having luminance and arrangement of color corresponding thereto by converting a luminance signal from a TV camera into an RGB signal at the same level and cutting off each RGB signal at a cut-off level set optionally in the different way to display the ouput. CONSTITUTION:An industrial TV system is constituted by an amplifier 3 connected to a color TV1 by a coaxial cable 2 and amplifying a picture signal and a luminance signal, a pseudo color making circuit 4 converting a luminance signal into a color signal and color picture tube 5. This pseudo color making circuit 4 is provided with an RGB separator 6 converting the luminance signal into each RGB signal by the same reference voltage 10. Each RGB signal from the separator 6 is inputted to a cut-off circuit 7 to set the cut-off level to each RGB signal optionally by a variable resistor 9. Further, each RGB signal is cut at a different cut-off level, its output is displayed on the color picture tube 5 and the color picture having luminance and arrangement of color corresponding thereto is displayed.