WO2007102173A1 - Three dimensional shade card generator - Google Patents

Three dimensional shade card generator Download PDF

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Publication number
WO2007102173A1
WO2007102173A1 PCT/IN2007/000092 IN2007000092W WO2007102173A1 WO 2007102173 A1 WO2007102173 A1 WO 2007102173A1 IN 2007000092 W IN2007000092 W IN 2007000092W WO 2007102173 A1 WO2007102173 A1 WO 2007102173A1
Authority
WO
WIPO (PCT)
Prior art keywords
shade
instrument according
generates
card
color
Prior art date
Application number
PCT/IN2007/000092
Other languages
French (fr)
Other versions
WO2007102173B1 (en
Inventor
Ramesh Datla
Milind Taskar
Original Assignee
Ramesh Datla
Milind Taskar
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ramesh Datla, Milind Taskar filed Critical Ramesh Datla
Publication of WO2007102173A1 publication Critical patent/WO2007102173A1/en
Publication of WO2007102173B1 publication Critical patent/WO2007102173B1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/52—Measurement of colour; Colour measuring devices, e.g. colorimeters using colour charts
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
    • G01J3/0251—Colorimeters making use of an integrating sphere
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/10—Arrangements of light sources specially adapted for spectrometry or colorimetry
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
    • G01J3/502—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors using a dispersive element, e.g. grating, prism
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
    • G01J3/51—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors using colour filters

Definitions

  • Color Measurement Instrument to be used as a Shade Card Generator and Printer machine for the following Industries, of the type three dimensional shade cards, the three dimensional objects for color render being objects of the users choice,
  • the Shade card can be viewed under any one of the following Illuminating condition/ Source of light of the user's choice. The user can introduce his own source of light also.
  • the Shade card making process is required to be repeated time and again, as the shade cards are distributed and finished.
  • No shade card conventional is a three-dimensional shade card.
  • Spectrophotometer specifications Spectrophotometer type - Bench top
  • Wavelength Interval 1,5,10 nm, user selectable.
  • Source Pulsed Xenon, with D65 filters or any other source.
  • Integrating Sphere 6 Inch or 1.5 Inch or 2 Inch or any other size Diameter. Coated inside with BaSO 4 / White Teflon.
  • UV filter Motorized.
  • the color to be added to the three dimensional shade cards is measured by spectrophotometer for % Reflectance values.
  • the Tristimulus values calculations for CIE 1964 10° observer for the primary llluminant D 65 are done as under,
  • the Reflectance of the color to be added to the shade card is converted in to tristimulus values employing D65 llluminant and Standard Observer of CIE 1964.
  • the CIE D65 table are 5 nm based.
  • the xbar, ybar, zbar table for 10° observer 1964 are taken from Wyszecki Stiles book at 1 nm interval.
  • RGB Color Spaces like: Adobe
  • This chromatic adaptation Transformed values of X Y Z of the destination are then used to calculate the R G B values as Chromatic Adaptation transformed R G B.
  • the X Y Z to R G B conversion can be done under the following RGB Color Spaces.
  • a library of such object is made as BMP, JPG files.
  • the above objects in the library are converted in to gray images and the library is kept as library of gray images, of the type three-dimensional type. So we have a large library of three dimensional BMP, or JPG images that are gray.
  • the whole three dimensional object will be at various pixels shades darker and lighter of the same color to produce the dimensional color render of the R G B to be rendered.
  • Any suitable render algorithm other than the above may be used for the purpose of creating shade cards.
  • the three-dimensional shade card can also be printed with true color reproduction.
  • Each color shade is shown as a three-dimensional color rendered on the object of user's choice of the size as desired by the user.
  • the shade cards can be printed.
  • shade cards can be made as three dimensional shade cards on the object of the user's choice.
  • the algorithm explained in various lighting conditions/sources can view the shade cards.
  • a users' own light source can also be used.
  • Shade card can be flat two dimensional, in various shapes like square, rectangle, brush mark, alphabet, circle, oval, triangle, hexagon, polygon etc.
  • Shade card is free from soiling and handling effect, does not age and fade.
  • Shade card can be three dimensional on the object of users choice.
  • Shade card can be viewed in all possible lighting conditions, illuminants.
  • Shade card can be used to paint the interior of a flat, building etc.
  • Shade card in textiles can be used to make apparel design.
  • Shade card can be sent across on CD, or emaiied.
  • a shade Card once made can be made into n number of copies and thus saving the cost of shade card making.
  • a conventional shade card making is cost, labour and material intensive, and needs to be made time and again.
  • This shade card can be three dimensional, unlike a conventional shade card.
  • Fig1 gives the schematic of the optical measurement instrument used for the above application. Description of Preferred Embodiment
  • Lamp/Diode Array Power Supply It is used to switch on and off the xenon flash lamp and diode array.
  • Xenon Flash Lamp They are convenient source for UV and visible light. These lamps are compact and generate a minimal amount of heat and are available in sizes ranging from 5 to 60 watts. The amount of output light, pulse width and repetition rate can be easily controlled.
  • Sample Position The liquid or the solid sample (from standard or batch) is placed here.
  • Collecting Optics It receives radiation reflected from the sample 8° normal to the sample surface, with the angular collection tolerances specified by CIE and ASTM, DIN and focuses on the fiber couple.
  • Fiber coupling It receives the focused light and transferred to the spectrum analyzer.
  • Mirrori Collimating concave mirror that collects the signal from the entrance slit to the grating.
  • Grating Plane reflection grating of 300/600 lines/mm used for dispersion of light into respective colors.
  • Mirror2 De collimating concave mirror grating to diode array.
  • Diode array detectors It consists of individual photodiodes with number of pixels defined, so as to have the specific band of wavelengths. Band pass - 1 nm. The photodiodes convert the light signal to electrical signal. Strength of the electrical signal is proportional to the light intensity.
  • I/O Card It has a necessary interfacing circuitry for CMOS linear image sensor and communicates with PC via USB
  • PC Used for collecting and analyzing the data through the software developed for the application.

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectrometry And Color Measurement (AREA)

Abstract

A color measurement instrument is used as a shade card generator and printer. Spectral geometries of D/8, D/0, 45/0, 0/45, D(hemisphere)/8, D(hemisphere)/0 or others are applied. The light spectrum of the illumination source (2) lies in the range of 350 - 1100 nm. An integrating sphere (3) is used in the case of D/8 geometry. A detector (7.5) and an optical assembly (7.2, 7.3, 7.4) using a variable sample aperture are between the light source (2) and the sample.

Description

Three Dimensional Shade Card Generator Description of the invention:
Color Measurement Instrument to be used as a Shade Card Generator and Printer machine for the following Industries, of the type three dimensional shade cards, the three dimensional objects for color render being objects of the users choice, The Shade card can be viewed under any one of the following Illuminating condition/ Source of light of the user's choice. The user can introduce his own source of light also.
Background:
Shade Card Making done conventionally is a required in all color related industries.
Conventional shade cards are being made by a process that is intensive in following aspects:
1. Material.
2. Labor
3. Matching Skill of Colorists.
4. Requires to spending money.
5. Requires lots of Space for storage of Colorants/Lacquers / card etc.
The Shade card making process is required to be repeated time and again, as the shade cards are distributed and finished.
Conventional Shade Cards are subject to:
1. Soiling
2. Fading.
3. Degradation of color.
4. Handling etc.
No shade card conventional is a three-dimensional shade card.
Prior Art:
The information that is required to create the Shade card is available. However, nobody has thought of exploiting the technology for the unique application of creation of shade card. So, the process being patented here is a unique process for the creation, distribution and circulation of shade cards that all the Color Industries require.
Over all design:
Spectrophotometer specifications: Spectrophotometer type - Bench top
Spectral range: 350-110O nm. (Top of the line.)
Wavelength Interval: 1,5,10 nm, user selectable.
Source: Pulsed Xenon, with D65 filters or any other source.
Measurement Mode: % Reflectance and % Transmission. Geometry: D/8,
Integrating Sphere: 6 Inch or 1.5 Inch or 2 Inch or any other size Diameter. Coated inside with BaSO4/ White Teflon.
Measurement principle: Double Beam./Single Beam.
Photometric Range: 0-200%.
Photometric Accuracy: 0.01% Reflectance. Or Transmission.
Measurement Apertures: 3 mm, 10 mm, and 24 mm.(1 inch diameter)
Calibration: White Tile, Black trap.
SCI /SCE: Motorized.
UV filter: Motorized.
Spectra Geometry: This can be D/8, D/0, 45/0, 0/45, D(hemisphere)/8, D(hemisphere)/O Invention patent applies to all the above geometries.
Algorithm/ Equations:
The color to be added to the three dimensional shade cards is measured by spectrophotometer for % Reflectance values. The Tristimulus values calculations for CIE 1964 10° observer for the primary llluminant D 65 are done as under,
The Reflectance of the color to be added to the shade card is converted in to tristimulus values employing D65 llluminant and Standard Observer of CIE 1964.
We employ the D65 CIE tables from the technical Bulletin of CIE for Energy Distribution of D65 llluminant. The CIE D65 table are 5 nm based. We do a Lagrange interpolation and calculate the data at 1 nm, from 5 nm, and store in the tables, for 1 nm interval.
The xbar, ybar, zbar table for 10° observer 1964 are taken from Wyszecki Stiles book at 1 nm interval.
We then use sRGB color space for X Y 2 to R G B conversion. This is done using the XYZ to RGB conversion by ICC color profiles for sRGB. The R G B calculated is scaled to 255.
R= R unitary X 255 G= G unitary X 255 B= B unitary X 255
The above R G B we employ for creation of three-dimensional shade card, in addition of two dimensional shade cards.
Note: the X Y Z to R G B can be done as per various. RGB Color Spaces like: Adobe
Apple
Best RGB
Beta RGB
Bruce RGB
NTSC
CIE
ColorMatch.
DonRGB4
ECI
Ekta Space PC5
PAL/SECAM
Prophoto,
SMPTE-C.
Widegamut.
The gamma value for each RGB COLOR space is given below, The llluminant column gives with respect to which llluminant the specific Color Space does the X Y Z Tristimulus calculations, for further calculations in to R G B.
RGB Space Gamma Ilium
Adobe RGB (1998) 2.2 D65
Apple RGB 1.8 D65
Best RGB 2,2 D50
Beta RGB 2,2 D50
Bruce RGB 2.2 D65
CIE RGB 2.2 E
Color Match RGB Space 1.8 D50
Don RGB 4 2.2 D50
ECI RGB 1.8 1 D50
Ekta Space PS5 2.2 D50
NTSC RGB 2.2 C
PAL/SECAM RGB 2.2 D65
ProPhoto RGB 1.8 D50
SMPTE-C RGB 2.2 D65 sRGB «2.2 D65
Wide Gamut RGB 2.2 D50
Transforming the X Y Z from one llluminant to another llluminant.
X destination Y destination Z destination
D65 X Source Y Source Z Source.
X White destination Y White destination Z White destination
D75 X White Source Y White Source Z White Source.
The above is done employing Bradford's Chromatic adaptation Transform algorithm, and employing the R G B cone responses of source illuminant and destination illuminant.
So you get a value each for
P Source γ source this is cone response domain for the source illuminant. β Source
So you get a value each for
P Destination γ Destination this is cone response domain for the destination illuminant. β Destination
Now we do
P Destination / P Source 7 Destination / Y Source P Destination / P Source
Thus by making the measurement in D65/10 degree, we can do the Chromatic Adaptation transform to any other Illuminant /Source.
This chromatic adaptation Transformed values of X Y Z of the destination are then used to calculate the R G B values as Chromatic Adaptation transformed R G B.
This enables us to depict the three-dimensional shade card in any user switched on illuminant.
Rendering algorithm on three dimensional objects of the user's choice:
User is given a choice for the three-dimensional objects of his choice on which the color is to be rendered on.
Like:
1. Interior of an apartment.
2. Chair for upholstery
3. Sofa.
4. Apparel.
5. Plastic Chair.
6. Ceramic Tiles. 7. As Printed Matter for Graphic arts.
8. Building Exterior.
9. Business Machine.
10. Telephones.
11. Curtains/Drapes.
12. Leather Purse, Valet.
13. Car.
14. Motorbike.
15. Any user desired object and so on
Note: The X Y Z to R G B conversion can be done under the following RGB Color Spaces. A library of such object is made as BMP, JPG files. The above objects in the library are converted in to gray images and the library is kept as library of gray images, of the type three-dimensional type. So we have a large library of three dimensional BMP, or JPG images that are gray.
Rendering algorithm:
Once the object is selected say Chair for upholstery. The programme scans the gray image for the individual pixels of the gray image
The gray image consists of pixels where R=G=B, or R and G and B are equal at various levels from O to 255.
For example, the scan may find 80% population of pixels where R=123 G=123 and B=123
10% population where R= 75 G=75 and B= 75, and so on.
So, we have to find out which group of pixels with the same R G B is in majority.
We assign the R G B of the color to be rendered to this group of pixels, which are in the majority in the three dimensional object.
Now, the gray group with R G B higher will get R+(difference in R), G +(Difference in G), and B +(Difference in B) to give a lighter color to the group.
Now, the gray group with R G B lower will get R-(difference in R), G -(Difference in G), and B -(Difference in B) to give a darker color to the group.
Any group of pixels R and G and B > 255 R and G and B =255. Also, any group of pixels R and G and B < 0 R and G and B = 0
Thus the whole three dimensional object will be at various pixels shades darker and lighter of the same color to produce the dimensional color render of the R G B to be rendered.
Any suitable render algorithm, other than the above may be used for the purpose of creating shade cards.
Shade Card now has: 1. Color Shade names,
2. R G B of each color shade.
3. Various gray objects of the three dimensional type to render.
4. Various shapes, brush marks etc. for two-dimensional flat depiction of the color also.
5. Square, Rectangle, Pentagon, Hexagon, Triangle, Brush mark, Alphabet, Circle, Ellipse, Oval,
% Reflectance of each Shade in case required for matching etc.
On a high fidelity photographic printer the three-dimensional shade card can also be printed with true color reproduction.
The three dimensional shade cards on the choice of user's own objects can be thus made. Each color shade is shown as a three-dimensional color rendered on the object of user's choice of the size as desired by the user.
Utility value:
The process being patented here is as under for the user.
Just by measuring by spectrophotometer, all the color shades to be included in the shade card can be incorporated in the Electronic Shade Card.
Using a high fidelity printer, the shade cards can be printed.
Further, the shade cards can be made as three dimensional shade cards on the object of the user's choice.
The algorithm explained in various lighting conditions/sources can view the shade cards. A users' own light source can also be used.
Measure by spectra and by patented process make it into shade card.
Shade card can be flat two dimensional, in various shapes like square, rectangle, brush mark, alphabet, circle, oval, triangle, hexagon, polygon etc.
Shade card is free from soiling and handling effect, does not age and fade.
Shade card can be three dimensional on the object of users choice.
Shade card can be viewed in all possible lighting conditions, illuminants.
Shade card can be used to paint the interior of a flat, building etc.
Shade card in textiles can be used to make apparel design.
Shade card can be sent across on CD, or emaiied.
Tangible/Intangible benefits.
❖ A shade Card once made can be made into n number of copies and thus saving the cost of shade card making. A conventional shade card making is cost, labour and material intensive, and needs to be made time and again.
❖ This shade card can be three dimensional, unlike a conventional shade card.
❖ Free from handling and soiling. Operating Platforms: Apple/Mackintosh, PC with Windows operating system Linux Operating System or any other operating system with 24 bit or 32 bit true color.
1. Industries,
2. Paints.
3. Plastics.
4. Textiles Dyeing/Printing.
5. Suiting.
6. Blended fabric.
7. Yarn.
8. Thread.
9. Carpets.
10. Paper.
11. Melange Fibers.
12. Rubber.
13. Glass.
14. Carpets.
15. Apparels.
16. Printing Inks / Graphic Arts.
17. Dyes.
18. Pigments.
19. Soft Drink Concentrates.
20. Automobiles.
Brief Description of Drawings
Fig1 gives the schematic of the optical measurement instrument used for the above application. Description of Preferred Embodiment
1. Lamp/Diode Array Power Supply: It is used to switch on and off the xenon flash lamp and diode array.
2. Xenon Flash Lamp: They are convenient source for UV and visible light. These lamps are compact and generate a minimal amount of heat and are available in sizes ranging from 5 to 60 watts. The amount of output light, pulse width and repetition rate can be easily controlled.
3. Integrating Sphere:
3.1: Entrance port of the light source into the integrating sphere
3.2 and 3.3: Baffles to avoid direct light from the xenon source to fall on the sample, so that the sample receives purely diffused light. 3.4: Sample port 3.5: SCI/SCE: Specular component included or excluded. It is a lid hinged out and in to be used as a specular trap. 3.6: Exit port of the sphere
4. Sample Position: The liquid or the solid sample (from standard or batch) is placed here.
5. Collecting Optics: It receives radiation reflected from the sample 8° normal to the sample surface, with the angular collection tolerances specified by CIE and ASTM, DIN and focuses on the fiber couple.
6. Fiber coupling: It receives the focused light and transferred to the spectrum analyzer.
7. Spectrum Analyzer:
7.1: Entrance slit of the spectrum analyzer and exit port of the fiber optic probe
7.2: Mirrori: Collimating concave mirror that collects the signal from the entrance slit to the grating.
7.3: Grating: Plane reflection grating of 300/600 lines/mm used for dispersion of light into respective colors.
7.4: Mirror2: De collimating concave mirror grating to diode array.
7.5: Diode array detectors: It consists of individual photodiodes with number of pixels defined, so as to have the specific band of wavelengths. Band pass - 1 nm. The photodiodes convert the light signal to electrical signal. Strength of the electrical signal is proportional to the light intensity.
8. I/O Card: It has a necessary interfacing circuitry for CMOS linear image sensor and communicates with PC via USB
9. PC: Used for collecting and analyzing the data through the software developed for the application.

Claims

We claim,
1. An color measurement instrument to be used as a shade card generator and printer machine with D/8, D/0, 45/0, 0/45, D(hemisphere)/8, D(hemisphere)/O or any other spectral geometry in the range of 350-1100 nm or with any wavelength combinations in visible region of user's choice with the illumination source, integrating sphere (in case of D8), detector with an optical assembly between source and the sample & the sample and the detector for proper optical focusing using a variable sample aperture.
2. An instrument according to claim 1, wherein has a wavelength interval of <1nm, 1 nm, 5 nm, 10 nm, 20 nm or user selectable and measurement principle is single/double beam and is also preferred to as color spectrophotometer.
3. An instrument according to claim 1, wherein generates all the color shades to be included in the shade card, which can be incorporated in the electronic shade card, just by measurement by the instrument as above claimed,
4. An instrument according to claim 1, generates shade cards, which can be flat, two dimensional, in various shapes like but not limited to square, rectangle, brush mark, alphabet, circle, oval, triangle, hexagon, polygon.
5. An instrument according to claim 1 , generates shade cards which are free from but not limited to soiling, fading, handling, aging.
6. An instrument according to claim 1, generates a three-dimensional shade card, unlike the conventional shade cards, on the object of the user's choice.
7. An instrument according to claim 1 , generates a shade card that can be viewed in all possible lighting conditions and illuminants.
8. An instrument according to claim 1 , generates a shade card that can be used to but not limited to paint the interior of a flat, building.
9. An instrument according to claim 1, generates a shade card, that can be used in but not limited to textiles to make apparel design.
10. An instrument according to claim 1, generates a shade card that can be sent across on CD or e-mailed.
11. An instrument according to claim 1, can be connected to a high fidelity photographic printer as to print out the shade cars with true color reproduction.
12. An instrument according to claim 1, generates a shade card as in claim 3, which can be viewed even by transforming the color from one illuminant to another illuminant.
13. An instrument according to claim 1, generates a shade card which can be made into n number of copies and thus saving the cost of shade card making.
14. An instrument according to claim 1, generates a shade card under any operating platform like apple/Mackintosh, windows, iinux or any other platform with 24 and above bit true color.
PCT/IN2007/000092 2006-03-09 2007-03-08 Three dimensional shade card generator WO2007102173A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN419/CHE/2006 2006-03-09
IN419CH2006 2006-03-09

Publications (2)

Publication Number Publication Date
WO2007102173A1 true WO2007102173A1 (en) 2007-09-13
WO2007102173B1 WO2007102173B1 (en) 2007-12-06

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103542938A (en) * 2013-10-24 2014-01-29 杭州彩谱科技有限公司 Spectrophotometer for SCI error correction based on D/8 condition and method thereof
CN103557942A (en) * 2013-10-12 2014-02-05 杭州彩谱科技有限公司 Double-light-source color photometer with SCI/SCE test conditions compatible and implementation method
WO2019220799A1 (en) * 2018-05-15 2019-11-21 コニカミノルタ株式会社 Color measuring device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5764352A (en) * 1995-08-05 1998-06-09 Balzers Und Leybold Deutschland Holding Ag Process and apparatus for spectral reflectance and transmission measurements
WO2005050150A1 (en) * 2003-11-10 2005-06-02 Ciba Specialty Chemicals Holding Inc. Process for matching a target color

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5764352A (en) * 1995-08-05 1998-06-09 Balzers Und Leybold Deutschland Holding Ag Process and apparatus for spectral reflectance and transmission measurements
WO2005050150A1 (en) * 2003-11-10 2005-06-02 Ciba Specialty Chemicals Holding Inc. Process for matching a target color

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103557942A (en) * 2013-10-12 2014-02-05 杭州彩谱科技有限公司 Double-light-source color photometer with SCI/SCE test conditions compatible and implementation method
CN103542938A (en) * 2013-10-24 2014-01-29 杭州彩谱科技有限公司 Spectrophotometer for SCI error correction based on D/8 condition and method thereof
WO2019220799A1 (en) * 2018-05-15 2019-11-21 コニカミノルタ株式会社 Color measuring device

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