title: Brightness (value) sequence for the Vita Lumin Classic shade guide reassessed.
abstract: The purpose of this study was to locate the 16 shade tabs from the Vita Lumin 'Classic' shade guide within the quantitative Luminosity, R, G and B scales (0-255 scales) using Photoshop software. A new value order arranged according to the Photoshop scale demonstrated a more linear relationship between the 16 shade tabs than the order given by the manufacturer. A Brightness Index representing the percentage difference in value between pairs of reordered shade tabs is suggested as a more realistic determinant of change in shade tab value.
authors.affiliation: Paramount Mansion, Hurghom, Kowloon, Hong Kong. lennislee@gmail.com
authors.forename: Kit-Yee
authors.initials: KY
authors.lastname: Lee
authors.forename: Derrick
authors.initials: D
authors.lastname: Setchell
authors.forename: Alastair
authors.initials: A
authors.lastname: Stokes
authors.forename: David R
authors.initials: DR
authors.lastname: Moles
mesh_terms: D007091:Image Processing, Computer-Assisted; D008027:Light; D017797:Prosthesis Coloring / Q000592:standards*; D012015:Reference Standards; D012044:Regression Analysis