Correcting reflectance output values

A method including:

• detecting first reflectance output values acquired from reference samples over a wavelength range using a first color measuring device;
• detecting, second reflectance output values acquired from the reference samples over the wavelength range using a second color measuring device;
• determining, for a plurality of wavelength values within said wavelength range, correspondences between a first reflectance output value acquired by the first color measuring device and a second reflectance output value acquired by the second color measuring device;
• performing, for each of said plurality of wavelength values, an interpolation of said determined correspondences, to obtain interpolation data representative of correspondences between a reflectance output using the first color measuring device and a reflectance output using the second color measuring device over the wavelength range;
• detecting, from a sample of interest, third reflectance output values over the wavelength range using the second color measuring device;
• and
• applying the interpolation data to the third reflectance output values to correct an error induced by the second color measuring device while acquiring the third reflectance output values.

A device including:

• a processor with an associated memory unit storing a computer program, wherein, when running the computer program, the processor implements an acquiring unit, a processing unit and a correcting unit;
• the acquiring unit to obtain first reflectance output values acquired from at least two reference samples by a reference color measuring device over a wavelength range, wherein the acquiring unit is to obtain second reflectance output values acquired from the at least two reference samples by a second color measuring device over the wavelength range, said second color measuring device being distinct from the reference color measuring device;
• the processing unit to determine, for a plurality of wavelength values within said wavelength range, correspondences between a first reflectance output value acquired by the reference color measuring device and a second reflectance output value acquired by the second color measuring device, and to perform, for each of said plurality of wavelength values, an interpolation based on the correspondences to obtain interpolation data, wherein the acquiring unit is to obtain third reflectance output values acquired from a sample of interest by the second color measuring device over the wavelength range;
• and
• the correcting unit to correct the third reflectance output values based on the interpolation data.