Duotone refers to an image with various shades of a hue mapped in an vector or wedge through a color space. The colorant, the gradient curve, and the number of colorants used define the slice through the color space. The image is printed with two or more analogue colorants. The colorants may be custom formulated or selected from a named color system. Typically two colorants are placed on a subs...

The human color constancy uses spatial comparisons. The relationships among neighboring pixels are far more important than the absolute differences between the colorimetric values of an original and its gamut-limited reproduction. If all the pixels in an image have a reproduction error in the same direction (red, green, blue, lightness, hue, chroma), then our color constancy mechanism helps to ...

In earlier papers, NIST proposed a standard illumination source and optical filter targets with which to assess the state-of-the-art of display measurement. The Display Measurement Assessment Transfer Standard (DMATS) was designed to present the display metrologist with a rectangular array of targets such as color filters, polarizers, and grilles, back-lighted by uniform illumination, to be mea...

A psychophysical evaluation was performed to test the quality of several color gamut mapping algorithms. The task was to determine which mapping strategy produced the best matches to the original image. Observer preference was not considered. The algorithms consisted of both devicedependent and image-dependent mappings. Three types of lightness scaling functions (linear compression, chroma weig...

We treat image-to-device gamut mapping as a multi-criteria optimization problem. Our approach leads to a parameterized mathematical optimization problem that allows to constrain the degree to which objectives like contrast preservation, hue preservation, saturation preservation and the continuity of the mapping can be violated while maximizing the device gamut exploitation. We demonstrate the f...

As captured imagery grows in resolution to gigapixels, increases in dynamic range beyond what can be displayed, and encompasses wider fields of view, there is a need for the viewer of such imagery to take on many of the roles traditionally relegated to the camera. Fully exploring such imagery requires a software camera. One such software camera is HD View. We discuss the need for the evolution ...

Visual attention retargeting attempts to modify an image such that the viewer’s attention is directed to specific regions. Goals include highlighting a particular object or hiding possible problems in the image. In this work, we show that we can pose the visual retargeting problem in terms of gamut mapping. In short, visual attention retargeting can be achieved by performing gamut extension in ...

Colorimetry is limited to image data from a single pixel. Measures of errors between an “original” and a “reproduction” are usually described as the distance between the two values of a pixel in a colorimetric three-dimensional space. Human color constancy uses spatial comparisons between different parts of the image. The relationships among neighboring pixels are far more important than the ab...