Back to articles
Articles
Volume: 3 | Article ID: art00068
Image
Lightness filtering in color images with respect to the gamut
  DOI :  10.2352/CGIV.2006.3.1.art00068  Published OnlineJanuary 2006
Abstract

When image processing operations are performed on color images, it is normal that the production of out-of-gamut pixels is not prevented. The gamut mapping may reduce the effect of the image processing algorithm. In this paper we propose a generic method that allows grey image processing for lightness processing on color images without exceeding the limits of the gamut of the technique or device.In the proposed method the lightness processing is a function of the color of the pixel in question, the desired lightness change and a maximum and minimum lightness change per pixel. This maximum and minimum depend on the position of the pixel in the gamut of the output device and the relation between the lightness change and the chroma change. The hue of all pixels is kept constant. The monotonic character of the lightness correction guarantees that all points that were different before the lightness correction, remain different.The results of the proposed method are shown for two greyvalue image processing algorithms: 1) sharpening and 2) contrast improvement using gamma manipulation.For these two applications the gamut-limiting process is only advisable when the limiting is applied to the lightness dimension, rather than the chroma dimension.

Subject Areas :
Views 3
Downloads 0
 articleview.views 3
 articleview.downloads 0
  Cite this article 

Judith Dijk, Piet W. Verbeek, "Lightness filtering in color images with respect to the gamutin Proc. IS&T CGIV 2006 3rd European Conf. on Colour in Graphics, Imaging, and Vision,  2006,  pp 330 - 335,  https://doi.org/10.2352/CGIV.2006.3.1.art00068

 Copy citation
  Copyright statement 
Copyright © Society for Imaging Science and Technology 2006
72010351
Conference on Colour in Graphics, Imaging, and Vision
conf colour graph imag vis
2158-6330
Society of Imaging Science and Technology
7003 Kilworth Lane, Springfield, VA 22151, USA