Topic of your interest

Modelling colour appearance for full colour 3D printers

Short name: ColourMod 3D

Fogra no. 13.005
Project leader: Dr A. Kraushaar
Partner: Dr P. Urban (IGD Darmstadt), Dr A. Kienle (ILM)
Funding: BMWi (IGF) via AiF

 

Timescale: 1.10.2019 until 30.09.2021

Objective and relevance

With the aim of reducing the temporal and monetary characterisation and profiling effort of modern 3D full-colour printers and at the same time ensuring a practice-ready colour accuracy, intrinsic optical parameters of full-colour prints are to be recorded in this project and modelled and validated for practice-relevant fields of application. The optical characterisation of the components produced in Polyjet and Multijet fusion will provide the necessary parameters for visual characterisation (colour and translucency) and thus enable profiling and control. 

The implementation and performance optimisation of “Four-Flux-Model” as well as a feedback neural network promise a precise understanding of the relationship between the CMYKCW control values and the resulting colour appearance for many practical applications.

The 3D printing profiles to be developed are to be embedded in the ICC colour management architecture iccMAX (ISO 15076-2) and will be based on the control values available in practice for the concrete arrangement of the manufacturer or driver-dependent voxel arrangement.

Dr Andreas Kraushaar

Prepress Technology

+49 89 431 82 - 335

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I would be pleased to answer your questions about the project and look forward to exchanging ideas with you.

Solution steps

First, the intrinsic optical parameters of full-colour prints are to be recorded and modelled and validated for practice-relevant fields of application. The implementation and performance optimisation of the “Four-Flux-Model” and the Monte-Carlo based training of a feedback neural network promise a sufficiently precise understanding of the relationship between the control values cyan, magenta, yellow, black, clear medium and white (CMYKCW) and the resulting colour appearance for many practical applications. This relationship is to be investigated both on the basis of the control values (CMYKCW tonal values) available in practice and for the concrete arrangement of the manufacturer- or driver-dependent voxel arrangement (if available).

This is especially true for the fundamental optical characterization or modelling as well as the visual plausibility and practice-oriented measurability, which is strongly determined by the application case of the 3D printing industry. A first application case is the determination of the necessary measuring parameters for the development or adaptation of colour measuring devices, a second is the limits of the use of established colour measuring devices for the characterisation of 3D full colour prints or, if necessary, their further development or, for example, the concrete integration of 3D printing profiles in Photoshop for a colour-accurate preview (soft proof).

Targeted results

The objective of the proposed transaction is to enable suppliers of ICC profiling tools and optical instruments to offer solutions for the cost-effective and resource-efficient profiling of graphic 3D printers, thereby significantly reducing the described costs for SMEs (in particular 3D printing service providers).

Practical guidelines are to be written in German and English for the fields of application investigated. They should summarise in short, pictorial form the developed working tools, procedures and instructions for action and thus further support the implementation of the colour modelling developed in this project.