Method for determination of a matching colour variant

Patent metadata

Field	Value
Publication number	US-10830644-B2
Application number	US-99430709-A
Country	US
Kind code	B2
Filing date	May 26, 2009
Priority date	May 28, 2008
Publication date	Nov 10, 2020
Grant date	Nov 10, 2020

Abstract

The invention relates to a method of determination of a matching variant of a standard colour of a repair paint matching the effect colour of an object to be repaired, the method comprising the steps of a) determination of the standard colour of the colour of the object to be repaired, and b) determination of the best matching variant of the standard colour from a given number of variant colours, wherein ⋅ a swatch coated with the colour of the standard colour is visually compared under at least two different angles of illumination and/or observation with the colour to be matched, ⋅ the visual deviation from the standard colour and the colour of the object to be matched being evaluated on the basis of predetermined deviations for the visual properties, wherein the predetermined visual properties comprise at least one colour property and at least one texture property, ⋅ based on the predetermined deviations for the visual properties of the standard colour and the colour of the object to be matched, the best matching variant of the standard colour is determined.

First claim

The invention claimed is:

1. A method of preparing a repair paint matching the effect color of an object to be repaired, the method comprising
a) determining the standard color of the color of the object to be repaired, and
b) determining the best matching variant of the standard color from a 3-6 variant colors, by a method comprising
(i) visually comparing a swatch coated with the color of the standard color to the color to be matched under at least two different angles of illumination and/or observation,
(ii) evaluating the visual deviation of the standard color from the color of the object to be matched on the basis of predetermined deviations in predetermined visual properties, wherein the predetermined visual properties comprise lightness, color direction and coarseness,
(iii) determining the best matching variant of the standard color based on the evaluation in (ii) and a database of sets of the predetermined deviations for the predetermined visual properties of (ii) linked to specific variants of standard colors, wherein the predetermined visual property having the highest deviation is given a higher weight than the other predetermined visual properties in the determination process, and

further comprising preparing a paint of the best matching color variant.

2. The method according to claim 1 , wherein the color of the object to be matched is a metallic and/or pearlescent color.

3. The method according to claim 2 , wherein the predetermined visual properties include lightness, color direction, and coarseness.

4. The method according to claim 1 , wherein the best matching variant is determined from at least three variant colors.

5. The method according to claim 4 , wherein the best matching variant is determined from at most six variant colors.

6. The method according to claim 1 , wherein the best matching variant is determined from at most six variant colors.

7. The method according to claim 6 , wherein the best matching variant is determined using a database wherein sets of deviations for predetermined visual properties are linked to specific variants of standard colors.

8. The method according to claim 7 , wherein the database is implemented on an electronic data storage and processing unit.

9. The method according to claim 1 , wherein the direction and the magnitude of the deviation for the predetermined visual properties are indicated by predetermined symbols.

10. The method according to claim 1 , wherein the deviation for predetermined visual properties is determined under a source of illumination having a spectral distribution which is essentially the same as natural daylight.

11. The method according to claim 1 , wherein the database is implemented on an electronic data storage and processing unit.

12. The method according to claim 1 , further comprising the step of determination of a recipe for preparing a paint of the best matching color variant.

13. The method according to claim 12 , wherein a paint of the best matching color variant is prepared by following the determined recipe.

14. The method according to claim 13 , wherein the paint prepared is used for refinishing an automobile or a large transportation vehicle.

15. The method according to claim 1 , wherein the best matching variant is determined from at least three variant colors.

16. The method according to claim 1 , wherein the best matching variant is determined from at most six variant colors.

17. The method according to claim 1 , wherein the deviation for predetermined visual properties is determined under a source of illumination having a spectral distribution which is essentially the same as natural daylight.

Assignees

• Craighead Alan
• Griffith Claude
• Njo Swie Lan
• Akzo Nobel Coatings Int Bv

Inventors

• Craighead Alan
• Griffith Claude
• Njo Swie Lan

Classifications

• G01J5/026

  Control of working procedures of a pyrometer, other than calibration; Bandwidth calculation; Gain control · CPC title

• G01J5/0014

  for sensing the radiation from gases, flames · CPC title

• G01J3/463

  Colour matching · CPC title

• G01J3/504

  Goniometric colour measurements, for example measurements of metallic or flake based paints · CPC title

• G01J3/465

  taking into account the colour perception of the eye; using tristimulus detection · CPC title