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Using gray-balance control in press calibration for robust ICC color management in sheet-fed offset
KTH, Superseded Departments, Computer and Systems Sciences, DSV.
2004 (English)In: Proceedings of the Technical Association of the Graphic Arts, TAGA, 2004, 1-20 p.Conference paper, Published paper (Refereed)
Abstract [en]

The use of gray-balance control in press calibration for robust ICC color management in sheet-fed offset is discussed. Gray-balance control is a way to calibrate printing presses. It is found possible to print without a color cast, and still keep print contrast, density, dot gain and CIELAB values for the secondary colors at an acceptable level. It is shown that the ICC profile can give a similar print quality on different papers.

Place, publisher, year, edition, pages
2004. 1-20 p.
Keyword [en]
Balance, Gray, Offset, Sheetfed, Stability
National Category
Media and Communication Technology
Identifiers
URN: urn:nbn:se:kth:diva-6577Scopus ID: 2-s2.0-23244447404OAI: oai:DiVA.org:kth-6577DiVA: diva2:11325
Conference
56th Annual Technical Conference of the Technical Association of the Graphic Arts, TAGA 2004; San Antonio, TX; United States; 20 April 2004 through 20 April 2004
Note

QC 20100617

Available from: 2006-12-12 Created: 2006-12-12 Last updated: 2014-12-09Bibliographically approved
In thesis
1. Studies on image control for better reproduction in offset
Open this publication in new window or tab >>Studies on image control for better reproduction in offset
2006 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

This research work has focused on studies of image control for better reproduction in offset and has been applied practically. This research work has resulted in a survey of color management knowledge, a communication list concerning ICC profiles, an educational kit, a proposal for a new terminology and a patent concerning image adaptation.

The work is divided into following three areas:

1) image classification

A better understanding of image processing can avoid misunderstandings in the print and leading to more satisfied customers. To achieve optimal print quality for different images, it is important to adapt the prepress settings to the image category. Images can be divided into different categories depending on their image content, key information and tone distribution.

Trials have been carried out in which the IT.8 test chart has been adapted to different image categories. The results of the image adaptation suggest that an adjustment only to low-key images (dark images) is sufficient, as even normal-key images then show a better similarity to the original image. The low-key image showed more details in dark areas.

2) color separation

Two studies has been carried out. The purpose has been to investigate the knowledge level in color separation, the use of ICC-profiles and the understanding of color management in various printing houses in Sweden. This was done to identify and suggest new applications and suggested actions. These studies indicate that there is a serious problem in the graphic arts industry. The problem is that there is both an insufficient knowledge of color management and a lack of communication. There is a lack of competence and a lack of literature and instructions which can help printers to better understand the technology, and communication suffers through a lack of a common language.

3) suggested actions and the development of tools

Terminology simplification is crucial for the users. A new term for separation “Compensation by Black”, CB, has been suggested. A single term should make it easier for the users to understand and use the different settings which impact the image reproduction. A new tool/kit for the evaluation of ICC-profiles has been created. The goal of this educational kit is to facilitate and exemplify the practical understanding of profiles and their use for the users.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. 101 p.
Series
Trita-CSC-A, ISSN 1653-5723 ; 2006:27
National Category
Computer Science
Identifiers
urn:nbn:se:kth:diva-4224 (URN)978-91-7178-524-4 (ISBN)
Presentation
2006-12-15, E2, KTH, Lindstedsvägen 3, Stockholm, 13:00
Opponent
Supervisors
Note
QC 20101112Available from: 2006-12-12 Created: 2006-12-12 Last updated: 2010-11-12Bibliographically approved
2. Toward better image reproduction in offset
Open this publication in new window or tab >>Toward better image reproduction in offset
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis has focused on color reproduction processes in the graphics field and is based on theoretical research and practical studies. The purpose of this thesis was to investigate how new tools and tools adapted to a specific production set-up can be used to raise awareness regarding the quality and workflow of images and image processing for sheet-fed offset within the graphic industry.

The work is divided in to the following three study areas with several sub-studies:

1) The first research goal of the thesis is to identify knowledge levels regarding color separation of images and demand specifications within printing houses.

2) The second research goal is to investigate whether novel tools and new terminology can help to increase the knowledge level regarding color management

3) The third goal is to investigate whether process specific adaptation of key color control tools can improve quality levels

Three surveys about color reproduction (focusing on level of knowledge concerning color separation, the use of ICC-profiles and demand specifications for controlled color reproduction) at printing companies in Sweden were made between 2000 and 2004. The surveys indicated a serious problem in the graphic arts industry, involving both an insufficient understanding of color management and a lack of communication.

An important part of the work was to assist in make color management understandable for users and thereby optimize printing. For this purpose, digital test forms have been developed. The developed tools, together with descriptive material, will facilitate the understanding of color management issues. Definitions within the field of color separations have been examined, and changes have been suggested. A new term for separation “Compensation by Black”, CB, has been suggested, instead of e.g. GCR and UCR.

Is it possible to adapt the different parts of the process chain in order to achieve an improved production? Yes! This work has developed the method for adaptation of the scanne rtest chart, the printing test chart for image categorization and the control strip forsheet-fed offset using gray balance. This thesis suggests that it is possible to produce a custom-made IT8 target test chart for scanners and achieve a result at least similar to or even better than the standard test charts on the market. This work has also shown that itis possible to adapt the test chart for printing to image category. The result showed that low-key image separated by the image-adapted test chart showed more detail in the dark areas than a low-key image separated by the standard test chart, in the prints on a coated paper. The result from the adaptation of a control strip for sheet-fed offset showed that gray balance can be used as a control parameter for quality control in sheet-fed offset.

Place, publisher, year, edition, pages
Stockholm: KTH, 2010. 133 p.
Series
Trita-CSC-A, ISSN 1653-5723 ; 2010:06
Keyword
Images, offset, printing, ICC, color, gamut, profile, calibration, separation, GCR, UCR, characterization, gray balance
National Category
Computer Science Media and Communications
Identifiers
urn:nbn:se:kth:diva-12432 (URN)978-91-7415-609-6 (ISBN)
Public defence
2010-05-03, Sal F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC20100617Available from: 2010-04-21 Created: 2010-04-21 Last updated: 2010-08-26Bibliographically approved

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