Method for determining a hair coloration treatment

A system for determining a hair coloration treatment adapted for changing hair of a user from an initial hair color into a desired hair color, the system comprising:

• a user interface configured to receive as an input the initial hair color of the user and the desired hair color of the user;
• a data processing unit configured to store and run a program involving a first model for predicting hair color lightening results for at least one hair color lightening treatment, wherein the first model associates the at least one hair color lightening treatment with sets comprising each a first starting hair color and a corresponding lightened hair color achieved when applying the hair color lightening treatment onto hair having the first starting hair color;
• wherein the hair color lightening treatment comprises application of at least one among:
• a hair lightening product to hair having the first starting hair color and ultraviolet radiation to hair having the first starting hair color,
• wherein the first model is built using hair colors measured on hair having first starting hair colors that have been exposed to the at least one hair color lightening treatment and wherein the first model is a continuous model built using predictive analytics to provide predictions even for hair lightening treatments and starting hair colors for which no experimental results are available;
• wherein the data processing unit determines, using the inputs received from the user interface and the program, one among:
• a lightened hair color achieved when applying the at least one hair color lightening treatment onto the hair of the user, wherein the lightened hair color differs from the desired hair color by less than a first amount, wherein the first amount is a first distance calculated in a color space;
• and
• an intermediate hair color obtained when applying the at least one hair color lightening treatment onto the hair of the user, wherein the intermediate hair color corresponds to a starting hair color for which there exists at least one first hair coloration composition adapted for changing the starting hair color into a dyed hair color differing from the desired hair color by less than a second amount, wherein the second amount is a second distance calculated in the color space, and
• wherein the data processing unit further outputs the hair coloration treatment, wherein the hair coloration treatment comprises one among:
• a recommendation to apply the at least one hair color lightening treatment and a recommendation to apply the at least one hair color lightening treatment combined with the at least one first hair coloration composition.

A computer program product comprising instructions for executing a method for determining a hair coloration treatment adapted for changing hair of a user from an initial hair color into a desired hair color, the method comprising:

• obtaining the initial hair color of the user;
• obtaining the desired hair color of the user;
• obtaining a first model for predicting hair color lightening results for at least one hair color lightening treatment, wherein the first model associates the at least one hair color lightening treatment with sets comprising each a first starting hair color and a corresponding lightened hair color achieved when applying the hair color lightening treatment onto hair having the first starting hair color,
• wherein the hair color lightening treatment comprises application of at least one among:
• a hair lightening product to hair having the first starting hair color and ultraviolet radiation to hair having the first starting hair color,
• wherein the first model is built using hair colors measured on hair having first starting hair colors that have been exposed to the at least one hair color lightening treatment and wherein the first model is a continuous model built using predictive analytics to provide predictions even for hair lightening treatments and starting hair colors for which no experimental results are available;
• determining, using the first model, one among:
• a lightened hair color achieved when applying the at least one hair color lightening treatment onto the hair of the user, wherein the lightened hair color differs from the desired hair color by less than a first amount, wherein the first amount is a first distance calculated in a color space;
• and
• an intermediate hair color obtained when applying the at least one hair color lightening treatment onto the hair of the user, wherein the intermediate hair color corresponds to a starting hair color for which there exists at least one first hair coloration composition adapted for changing the starting hair color into a dyed hair color differing from the desired hair color by less than a second amount, wherein the second amount is a second distance calculated in the color space, and
• outputting the hair coloration treatment, wherein the hair coloration treatment comprises one among:
• a recommendation to apply the at least one hair color lightening treatment and a recommendation to apply the at least one hair color lightening treatment combined with the at least one first hair coloration composition.