In this paper, a perceptual color difference is presented as an alternative color difference metric for complex images instead of the conventional color difference equations. This color difference is derived based on Mahalanobis distance by using covariance matrices for differences of each color attributes. The covariance matrices for each class of images can be obtained by psychophysical exper...

Implementations of multi-primary displays for home cinema, mobile screens and soft proofing are described and analyzed. The design flexibility gained by using extra primaries is discussed for each, and the different considerations are highlighted. We show that in all cases the multi-primary displays suit the requirements of the application better than RGB displays. Introduction Our imaging need...

F bstract. Image compression schemes facilitate the transmission nd storage of data in an efficient form by reducing redundant image ata in the case of limited transmission bandwidth or storage space. owever, due to the irreversible nature of lossy compression, these chemes also introduce various types of color artifacts into the reonstructed image at a high compression ratio. Consequently, a h...

Current color-printing technologies may use three or more inks, e.g., CMY, CMYK, CMYKcm, CMYKGO, CMYKRGB. When the number of inks exceeds three, there is the usual color-management one-to-many mapping problem. Because the spectral properties of many modern inks are optimized for maximum color gamut and in some cases, black ink may not be used for pictorial images, many prints have poor color co...

of the reproduction’s. Therefore, if the lightness values of the maximum chroma in the two gamuts are not located at the center of the lightness axis of the two media, the parametric GMA will produce a different color change in the bright and dark regions. In this condition, if linear compression or soft-clipping compression is applied to the lightness mapping, the lightness value difference be...

In recent years, various color difference formulas were developed for the CIELAB space, such as CMC, CIE94 and CIEDE2000. Although these formulas have achieved greater accuracy in perceptual measurement between colors, many applications cannot take advantage of this greater precision, because the Euclidean distances in CIELAB are not isometric in accordance with these new formulas. Thus, applic...

The color handling characteristics of computer monitors and other display devices can significantly alter the way an image is perceived by the human eye. Modern cameras and software applications can create vibrant color scenes, and can specify the color range (or gamut) of the scene with an embedded ICC profile [1]. During presentation, differences in the color gamut of the image and the displa...

Color images have a gamut that typically spans three dimensions. Nevertheless, several important applications, such as the creation of grayscale images for printing and the re-coloring of images for color-deficient viewers, require a reduction of gamut dimension. This paper describes a technique for preserving visual detail while reducing gamut dimension. The technique is derived by focusing on...

In this paper, a color difference is defined instead of the conventional color differences to evaluate gamut-mapping techniques for electronic endoscope images reproduced on CRT under environmental illuminant. This color difference is defined from Mahalanobis distance by using covariance matrices for differences of metric lightness, chroma and hue angle. The covariance matrices for endoscope im...