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A multi colour separation system for graphic images

Eifion Jewell Orcid Logo

Journal of Print Media Technology and Research., Volume: 1, Issue: 4

Swansea University Author: Eifion Jewell Orcid Logo

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Abstract

This paper reports on the development of a six colour separation system for the rendition of multi coloured images. An algorithm is described which can be used for 6 colour separation of complex photographic images in order to maximise image gamut. Using a custom set of 6 colours a Yule Nielsen modi...

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Published in: Journal of Print Media Technology and Research.
ISSN: ISSN 2223-8905
Published: 2013
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URI: https://cronfa.swan.ac.uk/Record/cronfa37707
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first_indexed 2017-12-21T13:45:51Z
last_indexed 2018-02-09T05:31:22Z
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spelling 2017-12-21T12:40:07.9160417 v2 37707 2017-12-21 A multi colour separation system for graphic images 13dc152c178d51abfe0634445b0acf07 0000-0002-6894-2251 Eifion Jewell Eifion Jewell true false 2017-12-21 MECH This paper reports on the development of a six colour separation system for the rendition of multi coloured images. An algorithm is described which can be used for 6 colour separation of complex photographic images in order to maximise image gamut. Using a custom set of 6 colours a Yule Nielsen modified Neugerbauer equation is used to produce a colour model to predict colour mixing using 65 Neugerbauer primaries. Over 60% of the model predictions were within a E of 5. Some larger errors could be associated with the optical brighteners in the paper substrate. This model was considered sufficiently accurate for the basis of a colour separation model. To reduce computational effort at the separation stage a 243 pure lookup table was created to store the results of the colour model. This table creation is computationally heavy at the table creation stage, but fast for the user. The “one to many” mapping from XYZ to 6 colourants was dealt with by enabling a rule based system and a smoothing function. The rule based system is based on practical printing issues which would be could be experienced on press. To incorporate the possibility of a black separation for some dark images, a system was developed where the “in gamut” of any image is calculated in order to maximise output colour gamut. The system can be adapted for an increased number of base colourants. Journal Article Journal of Print Media Technology and Research. 1 4 ISSN 2223-8905 Colour separation. 1 3 2013 2013-03-01 http://www.jpmtr.org/JPMTR-0113-ggA.pdf COLLEGE NANME Mechanical Engineering COLLEGE CODE MECH Swansea University 2017-12-21T12:40:07.9160417 2017-12-21T12:39:05.6245871 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering Eifion Jewell 0000-0002-6894-2251 1
title A multi colour separation system for graphic images
spellingShingle A multi colour separation system for graphic images
Eifion Jewell
title_short A multi colour separation system for graphic images
title_full A multi colour separation system for graphic images
title_fullStr A multi colour separation system for graphic images
title_full_unstemmed A multi colour separation system for graphic images
title_sort A multi colour separation system for graphic images
author_id_str_mv 13dc152c178d51abfe0634445b0acf07
author_id_fullname_str_mv 13dc152c178d51abfe0634445b0acf07_***_Eifion Jewell
author Eifion Jewell
author2 Eifion Jewell
format Journal article
container_title Journal of Print Media Technology and Research.
container_volume 1
container_issue 4
publishDate 2013
institution Swansea University
issn ISSN 2223-8905
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering
url http://www.jpmtr.org/JPMTR-0113-ggA.pdf
document_store_str 0
active_str 0
description This paper reports on the development of a six colour separation system for the rendition of multi coloured images. An algorithm is described which can be used for 6 colour separation of complex photographic images in order to maximise image gamut. Using a custom set of 6 colours a Yule Nielsen modified Neugerbauer equation is used to produce a colour model to predict colour mixing using 65 Neugerbauer primaries. Over 60% of the model predictions were within a E of 5. Some larger errors could be associated with the optical brighteners in the paper substrate. This model was considered sufficiently accurate for the basis of a colour separation model. To reduce computational effort at the separation stage a 243 pure lookup table was created to store the results of the colour model. This table creation is computationally heavy at the table creation stage, but fast for the user. The “one to many” mapping from XYZ to 6 colourants was dealt with by enabling a rule based system and a smoothing function. The rule based system is based on practical printing issues which would be could be experienced on press. To incorporate the possibility of a black separation for some dark images, a system was developed where the “in gamut” of any image is calculated in order to maximise output colour gamut. The system can be adapted for an increased number of base colourants.
published_date 2013-03-01T03:47:31Z
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score 11.013619

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