The reflectances (to red light) of the silver bodies, white (or close to white) floor, green bodies and black line will be well separated, with the following gradation: silver bodies (brightest) >floor >green bodies >black line (darkest).

• 银色的人体、白色（或接近白色）的地板、绿色的人体和黑线的（相对于红光的）反射光将有明显的区别，其等级为：银色人体(最亮)>地板>绿色人体>黑线(最暗).