toLUVa
Converts the current color in LCHUVa color space to its equivalent in the LUVa color space.
The conversion involves computing the chromaticity coordinates U and V based on the chroma (c) and hue (h) of the color, and using the luminance (l) and alpha (opacity) values of the original color. The reference white point remains the same during the conversion.
Return
a ColorLUVa instance representing the color in the LUVa color space.