Introduction - If you have any usage issues, please Google them yourself
Knowledge of color patterns:
HSV color space
HSV (hue, saturation, value) color space model corresponds to a conical subset in cylindrical coordinate system, the corresponding top cone in V=1. which contains the RGB model of R=1, G=1, B=1 three, the color is bright. The color H is given by the rotation angle around the V axis. The red corresponds to the angle 0 degrees, the green corresponds to the angle 120 degrees, the blue corresponds to t