?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=The+importance+of+a+device+specific+calibration+for+smartphone+colorimetry&rft.creator=Nixon%2C+M&rft.creator=Outlaw%2C+F&rft.creator=MacDonald%2C+LW&rft.creator=Leung%2C+TS&rft.description=In+order+for+a+smartphone-based+colorimetry+system+to+be+generalizable%2C+it+must+be+possible+to+account+for+results+from+multiple+phones.+A+move+from+device-specific+space+to+a+device+independent+space+such+as+XYZ+space+allows+results+to+be+compared%2C+and+means+that+the+link+between+XYZ+values+and+the+physical+parameter+of+interest+needs+only+be+determined+once.+We+compare+mapping+approaches+based+on+calibration+data+provided+in+image+metadata%2C+including+the+widely+used+open-source+software+dcraw%2C+to+a+separate+calibration+carried+out+using+a+colorcard.+The+current+version+of+dcraw+is+found+to+behave+suboptimally+with+smartphones+and+should+be+used+with+care+for+mapping+to+XYZ.+Other+metadata+approaches+perform+better%2C+however+the+colorcard+approach+provides+the+best+results.+Several+phones+of+the+same+model+are+compared+and+using+an+xy+distance+metric+it+is+found+that+a+device-specific+calibration+is+required+to+maintain+the+desired+precision.&rft.publisher=Society+for+Imaging+Science+and+Technology&rft.date=2019-10-21&rft.type=Proceedings+paper&rft.language=eng&rft.source=+++++In%3A++27th+Color+and+Imaging+Conference+Final+Program+and+Proceedings.++(pp.+pp.+49-54).++Society+for+Imaging+Science+and+Technology%3A+Paris%2C+France.+(2019)+++++&rft.format=text&rft.identifier=https%3A%2F%2Fdiscovery.ucl.ac.uk%2Fid%2Feprint%2F10086021%2F1%2FCIC_Final.pdf&rft.identifier=https%3A%2F%2Fdiscovery.ucl.ac.uk%2Fid%2Feprint%2F10086021%2F&rft.rights=open