Y = a * R + b * G + c * B
Cb = (B - Y) / d
Cr = (R - Y) / e
| BT.601 | BT.709 | BT.2020 | |
|---|---|---|---|
| a | 0.299 | 0.2126 | 0.2627 |
| b | 0.587 | 0.7152 | 0.6780 |
| c | 0.114 | 0.0722 | 0.0593 |
| d | 1.772 | 1.8556 | 1.8814 |
| e | 1.402 | 1.5748 | 1.4746 |
R = Y + e * Cr
G = Y - (a * e / b) * Cr - (c * d / b) * Cb
B = Y + d * Cb
They really are. I feel I will never gain my time back from learning this stuff.
e for BT.2020 should be 1.4746, it can be calculated by the following formula:
e = (1 - a) / 0.5,
d = (1 - c) / 0.5
e for BT.2020 should be 1.4746,
Fixed. thanks!
Looks like Cb/Cr should be centred around 0.5?
Y = a * R + b * G + c * B
Cb = (B - Y) / d + 0.5
Cr = (R - Y) / e + 0.5
Chrominance(Chroma) Cb/Cr are defined in the range [-0.5, 0.5].
Oh yup, my bad, I was thinking about it for use in a shader.
Color spaces are the most niche, rabbit holey thing ever, I swear