How to get a reference white point for RGB to CIELUV conversion?

[seyoung-solteq]

Hi Joseph,

Thank you and your team for the great course.
I'm trying to solve the extra problem "rgb to HCL".
I think I found relevant materials for the task:

• https://poynton.ca/PDFs/coloureq.pdf
• https://books.google.fi/books?id=YpzWCwAAQBAJ&pg=PA350&lpg=PA350&dq=ciexyz+to+cieluv&source=bl&ots=SFn2uR3hcy&sig=ACfU3U1CGiP69v-UvWnWjnaedBDavkX-qA&hl=en&sa=X&ved=2ahUKEwjys6-MxuroAhWkysQBHTWEC7oQ6AEwBnoECBQQKQ#v=onepage&q=ciexyz%20to%20cieluv&f=false

I'm stuck in CIEYuv to CIELUV. According to the materials, I need to know the colour of the white point of the system. So it seems like the space is display-specific.

I could compute the constants by converting the (1,1,1) rgb values to YUV but it probably doesn't make sense.

This OpenCV documentation has hard-coded constants. I'm currently using those values but I'm clueless how those values were computed in the first place. Also, I don't know if those values are correct for my case.

Could you provide some tips?
Thank you!

Br,
Seyoung