RGB <=> YCbCr(YPbPr) color space conversion

yuvrgb.md

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

• https://www.itu.int/rec/R-REC-BT.601
• https://www.itu.int/rec/R-REC-BT.709
• https://www.itu.int/rec/R-REC-BT.2020

Color spaces are the most niche, rabbit holey thing ever, I swear

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!