Remote Color Matching Process and System
Disclosed is a method and system for cost effective, convenient remote color reproduction and matching that can be used by product vendors and consumers. In a preferred embodiment, the method comprises capture of product color spectra using a spectrometer under controlled illumination, the calculation of optimum coloring mixing levels for a multi-primary display using primaries optimized to reduce observer metamerism, and the use of these mixing levels in a remote display exhibiting the optimized primaries in order to render the original product color in high fidelity. Other embodiments of the method and system include measurement of the consumer's CMF, filtering of the product color spectrum with these CMFs, and display of the color resulting from these tristimulus values on a remote RGB display. Various alternatives are disclosed for components of the system.
1 . A method of remote reproduction of article or product color that permits display of the article or product true color in avoidance of metamerism, the method comprising the steps of:
a. obtaining spectral information about the article or product,
b. using CMFs to mitigate observer metamerism,
c. publishing the spectral information in a form for consumer use, and
d. displaying in high fidelity the reproduced product color corresponding to the spectral information
2 . A method of remote reproduction of product color as recited in claim 1 wherein the spectral information is obtained by spectroscopic means, and publishing is electronic, online, in email, or in print.
3 . A method of remote reproduction of product color as recited in claim 1 wherein the spectrum information comprises product composite spectrum and illumination type, step b comprises:
i. measuring the consumer's CMFs and
ii. calibrating a display to the consumer's CMFs,
and step d includes:
i. filtering the composite spectrum with the consumer's CMFs and
ii. displaying of the color associated with the filtered composite spectrum on the calibrated display.
4 . A method of remote reproduction of product color as recited in claim 3 wherein the step of measuring the consumer's CMFs comprises:
i. adjusting a smartphone display in camera viewfinder mode to match the consumer's color perception of a plurality of printed calibration colors under controlled illumination, and
ii. extracting the resulting display profile to effectively measure the consumer's CMFs, and
wherein displaying of the color of the filtered composite spectrum is done on the smartphone display.
5 . A method of remote reproduction of product color as recited in claim 3 wherein the step of measuring the consumer's CMFs comprises:
i. adjusting a smartphone display in camera viewfinder mode to match the consumer's color perception of a plurality of real scenes, and
ii. extracting the resulting display profile to effectively measure the consumer's CMFs, and
wherein displaying of the color of the filtered composite spectrum is done on the smartphone display.
6 . A method of remote reproduction of product color as recited in claim 1 wherein the spectrum information comprises product composite spectrum and illumination type, step b comprises:
i. measuring the consumer's CMFs and
ii. filtering the composite spectrum with the consumer's CMFs to produce a filtered spectrum,
and step d comprises displaying the color associated with the filtered spectrum on a custom RGB display.
7 . A method of remote reproduction of product color as recited in claim 1 wherein the spectrum information comprises the reflectance spectrum, step b comprises:
i. measuring the consumer's CMFs and
ii. calibrating a display to the consumer's CMFs,
the following additional steps included after step c and before step d comprise:
i. measuring the consumer's illumination spectrum, and
ii. calculating the composite spectrum,
and step d further comprises displaying the color associated with the composite spectrum on the display calibrated to the consumer's CMFs.
8 . A method of remote reproduction of product color as recited in claim 1 wherein the spectrum information comprises the reflectance spectrum, step b comprises:
i. measuring the consumer's CMFs and
ii. filtering the composite spectrum with the consumer's CMFs to create a filtered spectrum,
the following additional steps included after step c and before step d comprise:
i. measuring the consumer's illumination spectrum, and
ii. calculating the composite spectrum, and
wherein step d further comprises displaying the color associated with the composite spectrum on a custom RGB display.
9 . A method of remote reproduction of product color as recited in claim 1 wherein the spectrum information comprises composite spectrum and illumination type, step b comprises:
i. providing a multispectral display with primary wavelengths selected to minimize observer metamerism and
ii. performing a spectral match to the primaries of the multi-primary display under a standard CMF colorimetric matching constraint to reproduce the color of the product, and
wherein step d further comprises displaying the reproduced product color with the multispectral display.
10 . A method of remote reproduction of product color as recited in claim 1 wherein the spectrum information comprises composite spectrum and illumination type, step b comprises:
i. providing a multispectral display with primary wavelengths selected to minimize observer metamerism,
ii. measuring the consumer's CMFs, and
iii. performing a spectral match to the primaries of the multi-primary display under a consumer CMF colorimetric matching constraint to reproduce the color of the product, and
wherein step d further comprises displaying the reproduced product color with the multispectral display.
11 . A method of remote reproduction of product color as recited in claim 1 wherein the spectrum information comprises the reflectance spectrum, step b comprises:
i. providing a multispectral display with primary wavelengths selected to minimize observer metamerism and
ii. performing a spectral match of the multi-primary display under a standard CMF colorimetric matching constraint to a composite spectrum upon the calculation of the composite spectrum from the reflectance spectrum and a measured consumer's illumination spectrum, and
wherein the following additional steps included after step c and before step d comprise:
i. measuring the consumer's illumination spectrum, and
ii. calculating the composite spectrum, and
wherein step d further comprises displaying the color associated with the composite spectrum on the multispectral display.
12 . A method of remote reproduction of product color as recited in claim 1 wherein the spectrum information comprises the reflectance spectrum, step b comprises:
i. providing a multispectral display with primary wavelengths selected to minimize observer metamerism,
ii. measuring the consumer's CMFs, and
iii. performing a spectral match of the multi-primary display under a consumer CMF colorimetric matching constraint to a composite spectrum upon the calculation of the composite spectrum from the reflectance spectrum and a measured consumer's illumination spectrum, and
the following additional steps are included after step c and before step d comprise:
i. measuring the consumer's illumination spectrum, and
ii. calculating the composite spectrum,
and wherein step d further comprises displaying the color associated with the composite spectrum on the multispectral display.
13 . A method of remote reproduction of article or product color that permits display of the article or product true color in avoidance of metamerism, the method comprising the steps of:
a. Measuring a consumer's CMFs by using a smartphone with camera function, further comprising the steps:
i. Using the smartphone display in camera viewfinder mode observed a colored scene, object, or color checker pattern to match the hues of the actual scene, object, or color checker pattern,
ii. Determine the user CMFs, given the display calibration and the spectral responsivity of the smartphone camera
b. Import vendor supplied spectrum information that includes product spectrum to the smartphone
c. Filter the product spectrum with the user CMFs
d. Display on the smartphone the color of the product associated with the CMF-filtered product spectrum
14 . A system for sensing and remote reproduction of color comprising:
a. a spectrometer for measuring an article's spectrum in the vendor's environment,
b. software for optimizing the reproduction of the spectrum by a set of multi-wavelength LEDs,
c. processing means hosting the software, and
d. a display device comprising:
i. a plurality of LEDs of multiple wavelengths,
ii. a color mixer,
iii. processing means for controlling color mixing,
iv. LED drive electronics, and
v. a user interface.
15 . A system for sensing and remote reproduction of color as recited in claim 14 further comprising:
a. a spectrometer for measuring an the consumer's illumination spectrum and
b. processing means for calculating a composite spectrum from a reflectance spectrum and an illumination spectrum.
16 . A system for sensing and remote reproduction of color as recited in claim 15 wherein the spectrometer for measuring the consumer's illumination spectrum and processing means for calculating a composite spectrum are made part of the display device.