Metal deco digital proofing process

Patent metadata

Field	Value
Publication number	US-11567710-B2
Application number	US-202017633825-A
Country	US
Kind code	B2
Filing date	Aug 21, 2020
Priority date	Aug 21, 2019
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

The described herein is a method for identifying a best match to a metal deco target color and distributing the best match to interested parties for ongoing validation. The method creates a digital proofing database that matches, for example, PantoneLIVE™ target colors and sets a defined digital inkjet standard to within desired tolerances. Also described is a system that implements the method.

First claim

What is claimed is:

1. A method for identifying a best match to a metal deco target color and distributing the best match to interested parties, comprising the steps of:
A) i) establishing white and metallic linearization gradation curves for use in a computer implemented environment;
ii) selecting a first candidate color as a match to a metal deco target color from a database of metal deco ink colors;

B) generating in a computer implemented environment an arrangement of colors comprising the first candidate color and one or more further candidate colors that differ from each other in color increments;
C) printing on a transparent sheet the arrangement of colors to create a digital proof of the plurality of colors;
D) laying the digital proof over a metal substrate to provide a simulation of the application of metal deco colored inks on the metal substrate; and
E) selecting a color from among the arrangement of colors on the digital proof as a best match to the metal deco target color; and
F) storing color data of the best match to the metal deco target color, wherein the color data comprises CIELAB color space information, in a computer storage location for retrieval by other parties.

2. The method of claim 1 , wherein color data for the best match to the metal deco target color further comprises one or more of printer separations, information concerning the digital proofer, and digital proofer settings.

3. The method of claim 1 , wherein a print of the color that is the best match to the metal deco target color is measured by an optical device such as a spectrophotometer in order to provide data used to assess that within a desired tolerance, output of the digital proofer accurately reproduces the previously defined digital representation of the desired color, wherein the data of the previously defined digital representation of the desired color are stored in a data base, and to provide validation data to validate the printed color against the previously defined digital representation of the desired color.

4. The method of claim 1 , wherein the target color and the best match to the metal deco target color are spot colors.

5. The method of claim 4 , wherein the spot colors are bespoke spot colors.

6. The method of claim 1 , wherein the target color is provided by a target color representation, such as a color swatch that is the target color printed on a substrate.

7. The method of claim 1 , wherein the step A selection of a first candidate color is performed by selecting a color from a metal deco color database.

8. The method of claim 1 , wherein the step A selection of a first candidate color is performed by optically analyzing a physical specimen that includes the metal deco target color with a spectrophotometer to obtain color data such as printer separations for the target color representation and then assigning the same data in into the computer implemented environment of step B.

9. The method of claim 1 , wherein the first candidate color and one or more further candidate colors that differ incrementally from each other differ incrementally in one or more of the CIELAB color space and in printer separations.

10. The method of claim 1 , wherein the stored color data of the best match to the metal deco target color comprises the printer separations.

11. The method of claim 1 , wherein the first candidate color and one or more further candidate colors are visually arranged in an array comprised of cells that correspond to the first candidate color and one or more further candidate colors, such as a honeycomb array comprised of cells that correspond to the first candidate color and one or more further candidate colors.

12. The method of claim 1 , wherein the best match to the metal deco target color selected in step E is saved to computer storage by selecting and saving a cell corresponding to same that is present in a computer generated visual representation of the arrangement of colors, such as an array of colors such as a honeycomb array of colors.

13. The method of claim 1 , wherein the printer separations of the best match to the metal deco target color selected in step E is saved to computer storage.

14. The method of claim 1 , wherein the metal substrate of step D has a curved surface.

15. The method of claim 1 , wherein the selecting of the best match in step E comprises: evaluating the digital proof comprising the first candidate color and one or more further candidate colors as the proof is positioned over the metal substrate in a lightbox and inspecting each color at angles of 0°, 45°, and 90° under D50 light source, and then selecting the best match to the metal deco target color.

16. The method of claim 1 , wherein the color that is selected a best match to the metal deco target color in step E is then selected as the first candidate color in step A and then steps B to F, and optionally steps F1 and/or F2, are performed again, wherein:
step F1 is a step in which color data for the best match to the metal deco target color, along with other pertinent information selected from printer separations, CIELAB color space information, information concerning the digital proofer such as proofer model, and digital proofer settings is saved to computer storage where it can be distributed to, or retrieved by, one or more parties with access to the storage device, and
step F2 is a step in which the printed color that is the best match to the metal deco target color is measured by an optical device in order to determine whether the output of the digital proofer accurately reproduces the previously defined digital representation of the desired color and to provide validation data to validate the printed color against the previously defined digital representation of the desired color.

17. A method of selecting and validating a standard color as a best match color comprising:
A) accessing a database that comprises Pantone reference colors;
B) correlating a Pantone reference color present in an accessible design file present in the database to a digital proof color target;
C) printing the digital proof color target onto a transparent sheet to provide a digital proof;
D) laying the digital proof over a metal substrate to provide a simulation of the application of metal deco colored ink on a metal substrate; and
E) measuring the digital proof while layed over the metal substrate with a sphere spectrophotometer and comparing generated spectrophotometer data to corresponding data for the digital proof color target present in a further database in order to validate the digital proof as a reproduction of digital proof color target.

18. The method of claim 17 , wherein the database is hosted in a cloud computing environment.

19. A system for creating a digital proof of a metal deco ink of a specific color representing a closest match to a target color; one or more inputs through which a first candidate color for a target color match is received by the system; a target color match generator that generates a plurality of colors comprising the first candidate color and one or more further candidate colors that differ from each other in color increments; a digital proofer for printing the plurality of colors on a transparent sheet to create a digital proof comprising the plurality of colors printed in the sheet; an input for selecting a color from among the array of further candidate colors printed on the digital proof as a second candidate color and a spectrophotometer, preferably a spherical spectrophotometer.

Assignees

• Sun Chemical Corp

Inventors

• Hayden Richard
• Cater Robin

Classifications

• H04N1/00023

  Colour systems · CPC title

• H04N1/60 Primary

  Colour correction or control {(H04N1/54 takes precedence)} · CPC title

• B44D3/003 Primary

  Methods or devices for colour determination, selection or synthesis, e.g. use of colour tables · CPC title

• G06F3/1208 Primary

  resulting in improved quality of the output result, e.g. print layout, colours, workflows, print preview · CPC title

• H04N1/54

  Conversion of colour picture signals to a plurality of signals some of which represent particular mixed colours, e.g. for textile printing · CPC title