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Hybrid Color Halftoning
Linköping University, Department of Science and Technology.
2010 (English)Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
Abstract [en]

Halftoning methods can be divided into two main categories, namely AM (Amplitude Modulated) and FM (Frequency Modulated). Some printing methods, such as Flexography, are not able to produce dots small enough to handle the highlights and the shadows of the original image by just using AM halftoning method. To overcome this problem FM method is used in the highlights (and the shadows) and an AM method in rest of the image.

Hybrid halftoning (combination of AM and FM) technique for grayscale images has already be presented showing the best way to place FM and AM dots in the resulting binary image. This thesis work is and extension of that and presents hybrid technique for color images. In color images, besides the problem of transition area between AM and FM, a number of other factors needs to be addressed. One of such factors is to define the starting point of FM technique in different color channels. In this work all the possibilities of combining AM and FM in different color channels have been investigated and then the best approach for hybrid color halftoning is proposed. This approach not only uses the best solution for starting point of FM halftoning in each channel but also places the different color dots in the highlights, as homogenously as possible.

Place, publisher, year, edition, pages
2010. , 46 p.
Keyword [en]
Halftoning, Color, Hybrid, Flexography, Printing, image reproduction
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-56737ISRN: LIU-ITN-TEK-A--10/024-SEOAI: diva2:321769
2010-05-31, TP-32, Campus Norrköping,, 10:15 (English)
Available from: 2010-06-07 Created: 2010-06-02 Last updated: 2010-06-07Bibliographically approved

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Aijazi, Ahmed Tausif
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Department of Science and Technology
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