# US 10,313,559 B2 · Rosette-free printing

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- Number: US 10,313,559 B2
- Document ID: US10313559B2
- Status: Granted
- Kind: B2
- Application number: 15/520,306
- Filed: 2014-11-26
- Published: 2017-11-23
- Granted: 2019-06-04
- Earliest claimed: 2014-11-26
- Assignees: HP Indigo B.V.
- Applicants: HP Indigo B.V.
- Inventors: Boaz Tagansky; Dror Kella; David L. Pereira
- Web page: https://patentgrep.com/patent/US10313559B2

## CPC

- H04N 1/4058: {with details for producing a halftone screen at an oblique angle (H04N1/4056 takes precedence)}
- G06K 15/1878: {Adjusting colours (image colour correction or control for documents in general H04N1/60)}
- G06K 15/1881: {Halftoning (halftoning of still images in general H04N1/405, H04N1/52)}
- H04N 1/52: Circuits or arrangements for halftone screening
- H04N 1/6008: {with primary colour signals, e.g. RGB or CMY(K)}
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS

## Abstract

In an example implementation, a method of rosette-free printing includes, in a printing device whose color plane misregistration is less than 15 percent of a screen ruling of a halftone screen, printing multiple color planes of a multicolor image using the halftone screen.

## Claims

### Claim 1

A method of rosette-free printing comprising:
in a printing device whose color plane misregistration is less than 15 percent of a screen ruling of a halftone screen, printing each color plane of multiple color planes of a multicolor image using a single halftone screen, the single halftone screen being the same halftone screen used to print each of the other color planes.

### Claim 2 (depends on 1)

A method as in claim 1, wherein printing each color plane of multiple color planes of a multicolor image using a single halftone screen comprises:
printing a first color plane with a first screen that has a first screen ruling and a first screen angle; and
printing a next color plane with a second screen having the first screen ruling and the first screen angle.

### Claim 3 (depends on 1)

A method as in claim 1, wherein printing each color plane of multiple color planes of a multicolor image using a single halftone screen comprises:
printing first dots of a first color plane using the single halftone screen; and,
printing second dots of a second color plane directly on top of the first dots using the single halftone screen.

### Claim 4 (depends on 1)

A method as in claim 1, wherein printing each color plane of multiple color planes of a multicolor image using a single halftone screen comprises:
printing first dots of a first color plane using the single halftone screen; and,
printing second dots of a second color plane at locations that are shifted from locations of the first dots using the single halftone screen.

### Claim 5 (depends on 1)

A method as in claim 1, wherein printing each color plane of multiple color planes of a multicolor image using a single halftone screen comprises:
printing first dots of a first color plane in a first order using the single halftone screen; and,
printing second dots of a second color plane in a second order using the single halftone screen.

### Claim 6

A printer for rosette-free printing comprising:
a stable color registration print engine;
a screen generator to create halftone screens; and
a screen manager to use a single and same halftone screen for printing all color planes of a multicolor image;
wherein the stable color registration print engine comprises a print engine to provide a color plane misregistration between the color planes of better than 15% of a screen ruling of the single and same halftone screen.

### Claim 7

A non-transitory machine-readable storage medium storing instructions for rosette-free printing that when executed by a processor of a printing device, cause the printing device to:
generate a first halftone screen; and
print all color planes of a multicolor image using the first halftone screen with a color plane misregistration between the color planes that is better than 15% of a screen ruling of the first halftone screen.

### Claim 8 (depends on 7)

A medium as in claim 7, wherein printing all color planes of a multicolor image using the first halftone screen comprises printing identical dot patterns for all the color planes.

### Claim 9 (depends on 8)

A medium as in claim 8, wherein printing identical dot patterns for all the color planes comprises printing the dot patterns directly on top of one another on a media page.

### Claim 10 (depends on 8)

A medium as in claim 8, wherein printing identical dot patterns for all the color planes comprises printing the dot patterns in shifted locations from one another on a media page.

### Claim 11 (depends on 8)

A medium as in claim 8, wherein printing all color planes of a multicolor image using the first halftone screen comprises printing all the color planes with zero angle of rotation between all the color planes.