Interesting paper on a potential file format....I need to go looking to see if this went anywhere..

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EDIT : Actually a more recent paper of his is also interesting and contains a link to a database of images for WB testing…

https://openaccess.thecvf.com/content/WACV2022/papers/Afifi_Auto_White-Balance_Correction_for_Mixed-Illuminant_Scenes_WACV_2022_paper.pdf

Looks like several other interesting ones…