Linearly interpolate between the gradient keys, using a perceptual color space for colors.
This mode finds the two keys adjacent to the requested evaluation time, and interpolates between them.
Color keys are interpolated using a perceptual "Oklab" color space, which often
produces more visually pleasing results than a simple GradientMode.Blend interpolation. It is slightly more expensive
to calculate than the simple blend mode though.
See Also: Gradient.mode, Gradient.Evaluate, Gradient.colorSpace.