Digital Image Compensation for Inkjet Dot Gain Uniformity

Solution Overview

Problem

Water-based inks in inkjet printing exhibit non-uniform dot gain, leading to undesirable coloration and reduced image detail, particularly in modern high-speed printing applications.

Innovation Solution

A method to dynamically modify digital images by adjusting ink drop characteristics based on ink and printing parameters, including color, distance, and substrate absorption, to achieve uniform ink spreading and mitigate dot gain.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If water-based inks are used in modern inkjet printing, then ecological, health, safety, economic, and profitability advantages are achieved, but non-uniform dot gain occurs leading to undesirable coloration and reduced image detail

Engineering Contradiction:

Improveecological and economic advantagesVSAvoiduniformity of ink spreading

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The system performs preliminary modification of the digital image by calculating and applying compensation factors to pixel values before printing. This pre-processing step anticipates the non-uniform dot gain that will occur during printing and adjusts the image data in advance, ensuring uniform ink spreading and preventing undesirable coloration and pattern formation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention changes the parameters of the digital image data by applying color-specific compensation factors. Different compensation factors are applied to different color channels (CMYK) based on their specific dot gain characteristics. This parameter transformation adjusts the pixel values to compensate for the non-uniform ink spreading that occurs with water-based inks.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If printing speed is increased in modern inkjet printing, then productivity is improved, but dot gain becomes more pronounced and harder to control

Engineering Contradiction:

Improveprinting speedVSAvoidcontrol of dot gain

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The system performs preliminary modification of the digital image by calculating and applying compensation factors to pixel values before printing. This pre-processing step anticipates the non-uniform dot gain that will occur during printing and adjusts the image data in advance, ensuring uniform ink spreading and preventing undesirable coloration and pattern formation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system incorporates feedback mechanisms where observed dot gain values are used to update and refine compensation factors. This feedback loop allows the system to learn from actual printing results and improve its compensation accuracy over time, maintaining precision even at higher printing speeds.

Inventive Principle:

Principle #23Feedback

3Ease of manufacture

If different color ink drops are printed, then image coloration is achieved, but each color exhibits different dot gain amounts creating unwanted patterns

Engineering Contradiction:

Improvecolor reproduction capabilityVSAvoiduniformity of dot gain across colors

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The system applies different compensation factors to different color channels (CMYK) based on their specific dot gain characteristics. Each color channel receives customized processing to compensate for its unique spreading behavior, ensuring uniform ink spreading across all colors and eliminating unwanted patterns and coloration issues.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The invention changes the parameters of the digital image data by applying color-specific compensation factors. Different compensation factors are applied to different color channels (CMYK) based on their specific dot gain characteristics. This parameter transformation adjusts the pixel values to compensate for the non-uniform ink spreading that occurs with water-based inks.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20260014802A1Systems and methods for dynamically modifying digital images based on ink and printing characteristics

Publication Date: 2026.01.15 ELECTRONICS FOR IMAGING INC

AI summary

Systems and methods for dynamically modifying digital images based on ink and printing characteristics for printable images are disclosed. In some embodiments, a method includes obtaining a digital source image, identifying one or more modification areas including a plurality of pixels where each pixel is correlated with one or more ink drops, determining an expected ink spreading value of each of the ink drops based at least in part on the color of the ink drops, modifying the plurality of pixels, and modifying the correlated ink drops. In some embodiments, the expected ink spreading value is based at least in part on the distance between ink channels and a curing station, the speed of the printing conveyor, the type of printing substrate, and the time each ink drop spends uncured on a printing substrate.