配色方案:   单色 对比色配色 (base + complement) 可调整的对比色配色 (split complements) 双对比色 (2 neighbors + complements) 类似色(base + neighbors)

Distance [0 to 60]:   °  0°- contrast, 60°- triade  Use it

Distance [-90 to 90]:   °  (90°- tetrade)  Use it

Distance [0 to 60]   °  add the complement  Use it