Printed on the back of the packaging for the GT Color Checker, is a chart that describes the 24 squares in terms of their color stated in terms of CIE (1931), as values of x. y and Y. The bottom row of squares numbered 19 through 24 are shades of gray; named "white" through "black".
I am unfamiliar with CIE (1931), but the values for "Y" look quite to be very close to what "L" would be in Lab scale which is a 0-100 scale of luminance. Can anyone shed any light on this connection please?
I would like to use the "white" square which has a "Y" value of 90 and estimate what that would be in RGB. Ninety percent of 256 would be 230 mathematically. Can I correctly infer that Y = .9 = RGB = 230?
Jerry Reed