Multiple color coordinate systems are usually involved in color image applications or systems. Forward and backward transformations are used to switch between color coordinate systems. The out of gamut problem emerges when the color coordinate systems’ gamut is different. Conventional approaches, including clipping R, G, B values and clipping luminance value are not ideal as they both produce s...

We have developed an HDTV that adopts semiconductor lasers involving three primary colors, red, green and blue for the light source. The adoption of a laser light source helped us realize a HDTV with a dramatically wide color gamut, namely 190% the color gamut of ITR-U BT.709. In addition, we have also developed an LSI that can deal with an extended color space xvYCC, which is a new internation...

Artists often want to change the colors of an image to achieve a particular aesthetic goal. For example, they might limit colors to a warm or cool color scheme to create an image with a certain mood or feeling. Gamut masking is a technique that artists use to limit the set of colors they can paint with. They draw a mask over a color wheel and only use the hues within the mask. However, creating...

This paper proposes a color decomposition method for a multi-primary display (MPD) using a 3-dimensional look-uptable (3D-LUT) in linearized LAB space. The proposed method decomposes the conventional three primary colors into multi-primary control values for a display device under the constraints of tristimulus matching. To reproduce images on an MPD, the color signals are estimated from a devi...

S. H. Kwok The Hong Kong University of Science and Technology Department of Information and Systems Management Clear Water Bay, Kowloon, Hong Kong Abstract. Out-of-gamut problems exist in color image processing and color reproduction in different devices. Extensive research has been done on transforming out-of-gamut colors to the inside of the output device’s color gamut for color reproduction....

A color correction method for balancing the color appearances, among a group of images, about a specified object or scene, such as panoramic images and object movies, is developed and tested in this paper. In order to increase the running speed of color correction and reduce the out-of-gamut color pixels, we introduce the selection of principal regions. The average color values of principal reg...

This paper describes a method for constructing a lookup table relating a three-dimensional CMY coordinate system to CMYK colorant amounts in a way that maximizes the utilization of the printer gamut volume. The method is based on an assumption, satisfied by most printers, that adding a black colorant to any combination of CMY colorants does not result in a color with more chroma. Therefore the ...

Several tools and techniques for the visualization of color gamuts have been presented in the past. We present a short survey on the topic, and conclude that tools with the possibility for interactive color adjustment in some color space are almost absent. Therefore, a new tool which combines the known techniques with the possibility of interactive gamut mapping is presented along with suggesti...

Color gamut refers to the range of colors that can be reproduced by an imaging system. The definition of gamut is quite clear for displays and for hard-copy printing. Color image science experts disagree, however, on the definition – or even applicability of the concept – of gamut for cameras. I argue that there is no such concept as “capture gamut.” At the conclusion of this note I’ll outline ...