Color interpolation through CIELAB space
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Tween Space controls which color model is used to interpolate between white, your picked color, and black. Different models trace different paths through perceptual color space — some preserve hue better, others keep lightness more uniform.
D65 vs D50: These refer to the reference white point (illuminant). D65 ≈ daylight (6504 K), used by sRGB, web, and most color science. D50 ≈ horizon light (5003 K), used by ICC profiles and Adobe Photoshop's Lab mode. The same physical color has slightly different L*a*b* numbers under each illuminant — mostly in the b* (blue–yellow) axis.
23-Step builds a tint/shade scale: the picked color is placed at the nearest lightness step, then interpolated toward white (tints) and black (shades) in the selected space.
Smooth draws two continuous curves (to white and to black, 200 samples each) so you can see the exact path through the 3D space.