Regarding the larger question... Inside an ICC profile, for example, the PCS illuminant if XYZ is formatted as such: XYZ 0.9642 1 0.82491 while as I shared, the illuminant of viewing condition is like the example,19.6445 20.3718 16.8089 I would think that the first example has been normalized with the largest number = 1? - Jeff Jeff Nova Chief Executive Officer Colorhythm https://colorhythm.com Mobile: +1 510-710-9590 Main: +1 415-399-9921 On Sat, Nov 5, 2022 at 12:42 PM WAYNE BRETL <waynebretl@cox.net> wrote:
"normalizing to [0,1] first" does not make sense to me. When you calculate the (lower case) x,y for the chromaticity plot, the values are automatically between 0 and 1.
x = (X)/(X+Y+Z) y = (Y)/(X+Y+Z)
On November 5, 2022 at 11:46 AM Jeff Nova via colorsync-users < colorsync-users@lists.apple.com> wrote:
Hello my colorful friends! I pray you are doing well.
I have a math question for you. I would like to display the viewing conditions' illuminant and surround on a 1931 2deg chromaticity plot. These are un-normalized CIEXYZ values that need to be normalized within the plot range (0-1 both axes) first.
Example:
sRGB IEC 2.1 profile:
Illuminant - 19.6445 20.3718 16.8089
Surround - 3.92889 4.07439 3.36179
How to normalize them? Please forgive my ignorance; I am learning every day.
I thank you in advance for any support you might be able to provide. : )
Jeff
Jeff Nova Chief Executive Officer
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