| ∆L* = L*t − L*c | h = arctg(b*/a*) |
| ∆a* = a*t − a*c | C* = (a*2 + b*2)1/2 |
| ∆b* = b*t − b*c | ∆E = (∆L*2 + ∆a*2 + ∆b*2) |
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