# Interpolation of a color sequence? - Kriging of cyclic values

Question asked by n_fullemann on Mar 28, 2013
Latest reply on Dec 7, 2013 by dpibal
Hello everyone,

For a few weeks I stay blocked with the same problem. I am trying to do an interpolation (Krigging) of a cyclic color sequence. In my case, this cyclic color sequence has 16 values. for instance, 1 corresponds to dark blue, 5 to violet, 9 to orange,13 to green and 16 to light blue. All other intermediate values are obtained by shading these colors.

My question is: How is it possible to make an interpolation (Krigging) of such a color sequence taking into account that colors are cyclic? In other words, how is it possible that a pixel located between a point having a dark blue color (value of 1) and another having a light blue color (value of 16) gets also a blue color (value of 1 or 16) and not an orange one (value of 8) ?

An option could maybe be to use the RGB values of the different colors and to do separately the interpolation for the 3 colors (one for the Red, one for the Green and one for the Blue RGB values) and then to combine them again. However, I have no idea if it would work and how to manage at the end to come back to my 16 colors.

Any help or suggestion would be greatly appreciated!