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Using Multicoloured...
Using Multicoloured Halftone Screens for Offset Print Quality Monitoring
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- Bergman, Lars (author)
- Högskolan i Halmstad,Linköpings universitet,Institutionen för teknik och naturvetenskap,Tekniska högskolan,Intelligenta system (IS-lab)
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- Kruse, Björn (thesis advisor)
- Linköpings universitet,Institutionen för teknik och naturvetenskap,Tekniska högskolan,Linköpings universitet, Institutionen för teknik och naturvetenskap
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- Verikas, Antanas (thesis advisor)
- Högskolan i Halmstad,Halmstad Embedded and Intelligent Systems Research (EIS)
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(creator_code:org_t)
- ISBN 9185297259
- Linköping : Institutionen för teknik och naturvetenskap, 2005
- English 104 s.
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Series: Linköping Studies in Science and Technology. Thesis, 0280-7971 ; 1147
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Abstract
Subject headings
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- In the newspaper printing industry, offset is the dominating printing method and the use of multicolour printing has increased rapidly in newspapers during the last decade. The offset printing process relies on the assumption that an uniform film of ink of right thickness is transferred onto the printing areas. The quality of reproduction of colour images in offset printing is dependent on a number of parameters in a chain of steps and in the end it is the amount and the distribution of ink deposited on the substrate that create the sensation and thus the perceived colours. We identify three control points in the offset printing process and present methods for assessing the printing process quality in two of these points:• Methods for determining if the printing plates carry the correct image• Methods for determining the amount of ink deposited onto the newsprintA new concept of colour impression is introduced as a measure of the amount of ink deposited on the newsprint. Two factors contribute to values of the colour impression, the halftone dot-size and ink density. Colour impression values are determined on gray-bars using a CCD-camera based system. Colour impression values can also be determined in an area containing an arbitrary combination of cyan magenta and yellow inks. The correct amount of ink is known either from a reference print or from prepress information. Thus, the deviation of the amount of ink can be determined that can be used as control value by a press operator or as input to a control system.How a closed loop controller can be designed based on the colour impression values is also shown.It is demonstrated that the methods developed can be used for off-line print quality monitoring and ink feed control, or preferably in an online system in a newspaper printing press.
Subject headings
- NATURVETENSKAP -- Data- och informationsvetenskap -- Datorteknik (hsv//swe)
- NATURAL SCIENCES -- Computer and Information Sciences -- Computer Engineering (hsv//eng)
Keyword
- Datorteknik
- multicolour printing
- printing process
- colour images
- colour impression
- CCD-camera
- Datorteknik
- Computer engineering
- Datorteknik
Publication and Content Type
- vet (subject category)
- lic (subject category)
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