| cie76 | Get the CIE76 color difference between two CIELab values. |
| cie94 | Get the CIE94 color difference between two CIELab values. |
| ciede2000 | Get the CIEDE2000 color difference between two CIELab values. |
| colordiff | Get the color difference between values in the CIELab color space. |
| get_closest_color | Get information about the closest RHS color to some CIELab coordinates. |
| name | Name a color given its coordinates in a specified color space. |
| rhs_color_names_2015 | UPOV names and groups for RHS colors. |
| rhs_color_values_2007 | RHS colors in different color spaces. |