Reflectance spectra estimation and colour space conversion using reference reflectance spectra

A computer-implemented method of generating a reflectance spectrum estimation transform for transforming a colour of an image into an estimated reflectance spectrum using a processor, the method comprising:

• the processor acquiring an input compensation transform for transforming the colour of the image into an input compensated spectrum;
• and
• the processor generating the reflectance spectrum estimation transform from the acquired input compensation transform and one or more reference reflectance spectra stored in a database of reference reflectance spectra.

A computer-implemented method of generating a colour space conversion transform for converting a colour of an image to a new colour space using a processor, the method comprising:

• acquiring, using the processor, an input compensation transform for transforming the colour of the image into an input compensated spectrum;
• and
• generating, using the processor, the colour space conversion transform from the acquired input compensation transform and one or more reference reflectance spectra in a database of reference reflectance spectra.

An apparatus for generating a reflectance spectrum estimation transform for transforming a colour of an image into an estimated reflectance spectrum, the apparatus comprising a processor for:

• acquiring an input compensation transform for transforming the colour of the image into an input compensated spectrum;
• and
• generating the reflectance spectrum estimation transform from the acquired input compensation transform and one or more reference reflectance spectra stored in a database of reference reflectance spectra.

An apparatus for generating a colour space conversion transform for converting a colour of an image to a new colour space, the apparatus comprising a processor for:

• acquiring an input compensation transform for transforming the colour of the image into an input compensated spectrum;
• and
• generating the colour space conversion transform from the acquired input compensation transform and one or more reference reflectance spectra in a database of reference reflectance spectra.