The colors.lab vocabulary implements CIE 1976 LAB colors, specifying luminance (in approximately [0,100] ), red/green, and blue/yellow components, together with an alpha channel.
laba

<laba> ( l a b alpha -- laba )

>laba ( color -- laba )


For more information, see https://en.wikipedia.org/wiki/Lab_color_space

See also
Colors