NSColor object representing an extended sRGB color space.
- macOS 10.12+
NSColor object. This color-additive color space has red, green, blue, and alpha components.
This color space has the same colorimetry as sRGB, but component values below
0 and above
1 may be encoded in this color space. Negative values are encoded as the signed reflection of the original encoding function.
y(x) = sign(x)*f(abs(x))