Red point: darker
Green point: lighter
Blue point: equal
Darker point: 2
Darker reflectance: E
Darker method: C
Equal score: 0.111534747109
Darker point darker score: not computed since the judgement is "E"
darker: E (eq: True, dd: None), confidence: 2, worker: AKG5TLUQ2WWED
darker: 2 (eq: False, dd: True), confidence: 2, worker: A1KH9UPH0D74QJ (marked invalid)
darker: 1 (eq: False, dd: False), confidence: 2, worker: A1TQYQG3VFJTWW
darker: E (eq: True, dd: None), confidence: 0, worker: A29LON3TC6GCJN
darker: E (eq: True, dd: None), confidence: 2, worker: A2MZLVT9DB9MGK
darker: 1 (eq: False, dd: False), confidence: 1, worker: A234WZ4KX8IW07
darker: 1 (eq: False, dd: False), confidence: 2, worker: A2VVSQ1PSXKGVE
(0: guessing, 1: probably, 2: definitely)