Red point: darker
Green point: lighter
Blue point: equal
Darker point: 1
Darker reflectance: E
Darker method: C
Equal score: 0.205996885454
Darker point darker score: not computed since the judgement is "E"
darker: 1 (eq: False, dd: True), confidence: 2, worker: A5R9TAN5DI19I (marked invalid)
darker: 2 (eq: False, dd: False), confidence: 2, worker: A3PEMQP28HYGHU
darker: E (eq: True, dd: None), confidence: 0, worker: A3VO5CW9ZY22MZ
darker: E (eq: True, dd: None), confidence: 1, worker: AE6N096CSI5HT
darker: E (eq: True, dd: None), confidence: 1, worker: A234WZ4KX8IW07
darker: E (eq: True, dd: None), confidence: 2, worker: A2XU16B4I9XQG5 (marked invalid)
darker: E (eq: True, dd: None), confidence: 2, worker: AE808DQDYM9F
darker: 2 (eq: False, dd: False), confidence: 2, worker: A2H4ON6BUHMY1L (marked invalid)
(0: guessing, 1: probably, 2: definitely)