An image processing apparatus includes: a display control section that causes a display device to display an image indicating a state in which a figure indicating a color gamut, a dot indicating a designated color, and one or more axes each indicating a feature amount of a color are viewed in an identical three-dimensional color space from a predetermined viewpoint; and a receiving section that receives an instruction issued by a user. The display control section changes, in accordance with the instruction, the image upon changing the viewpoint.

A method of color mapping a video signal represented in a first color volume from color mapping data to be applied on a video signal represented in a second color volume is disclosed. The method comprises:—color mapping (14) said video signal represented in a first color volume from said first color volume into said second color volume in the case where said first and second color volumes are different; and—color mapping (16) said color mapped video signal based on said color mapping data.

The present principles relate to a method and device for gamut mapping from a first color gamut towards a second color gamut. The method comprises obtaining a preserved key color (prsv_color.sub.K0) and a hue alignment angle (⊖.sub.K0) of the key color (color.sub.K0) for each key color (color.sub.K0) of at least 3 key colors to define a preserved gamut and a rotated gamut; and performing a hue mapping of a current color (color) from the first color gamut towards the second color gamut wherein in case the current color (color) is in a preserved gamut defined by the preserved key color (prsv_color.sub.K0), the hue mapped current color is unchanged, and in case the current color is out of the preserved gamut, the hue mapped current color is calculated from the hue alignment angle (⊖.sub.K0) of two adjacent key colors of the current color (rotated gamut) and from the preserved area.

The disclosure relates to a color gamut mapping device that allows a gamma characteristic for each color to be tuned to match a target gamma curve through color gamut mapping, a tuning method thereof, and an image processor including the same. The color gamut mapping device controls a hue and saturation of an image signal to match a target color gamut using a hue parameter assigned to each of a plurality of hue axes and a saturation parameter assigned to correspond to each of a plurality of saturation control areas of each hue axis, and the color gamut mapping device changes the saturation of the image signal by changing the saturation parameter which is assigned to each hue axis and corresponds to the uppermost saturation control area so that a gamma characteristic for each color of the image signal is changed to match a target gamma curve for each color.

A method includes generating color correspondence information correlating L number of first reference color specification values in a first color space with L number of determined second color specification values in a second color space on a one-to-one basis. The L number of determined second color specification values includes (L−Q) number of unmodified second reference color specification values, (Q−N) number of modified second reference color specification values modified in a first modification process but not in the second modification process, and N number of remodified second reference color specification values which are modified in both the first modification process and the second modification process, where L is an integer greater than or equal to two, Q is an integer greater than or equal to one and smaller than or equal to L, and N is an integer greater than or equal to one and smaller than or equal to Q.

An image processing apparatus includes a controller configured to perform: setting characteristic information including first characteristic information and second characteristic information; and converting a target image data using the characteristic information. The first and second characteristic information correlate input values with output values in a specific color space. The input values includes a specific input value within a specific range. The specific input value is correlated with a first specific output value by the first characteristic information, and is correlated with a second specific output value by the second characteristic information. The first specific output value indicates that a colorant consumption quantity for the specific input value is changed from an original colorant consumption quantity by a first colorant quantity. The second specific output value indicates that the colorant consumption quantity is changed from the original colorant consumption quantity by a second colorant quantity different from the first colorant quantity.

Color data may be collected from a plurality of sources. A plurality of color map selection fields may be indexed at a table to a plurality of color maps. The plurality of color maps may be based on the collected color data. Each entry of the table may include an identifier to match one of the plurality of color maps to at least one permutation of the color map selection fields.

Disclosed is a color gamut matching method. The method includes: obtaining image data to be matched of a source terminal; establishing a preliminary matching relationship between the image data to be matched and image data to be output of a display terminal according to color gamut data coordinates of the source terminal and color gamut data coordinates of the display terminal; obtaining preliminary image data to be output of the display terminal according to the preliminary matching relationship; and accurately matching the preliminary image data to be output of the display terminal according to a 3D look-up table to obtain accurate image data to be displayed of the display terminal. Further disclosed are a color gamut matching device, a display terminal and a readable storage medium. The present disclosure can solve the color distortion of the display color gamut and improve the display effect of the display.

Image and video processing techniques are disclosed for processing components of a color space individually by determining limits for each component based on the relationship between each component in a color space. These limits may then be used to clip each component such that the component values are within the determined range for that component. In this manner, more efficient processing of images and/or video may be achieved.

An image reproduction system and methods for providing colorant data to an end device are disclosed. A method includes extracting general HSV value data for each pixel of an image from image data. For each pixel, the general HSV value data is transformed to generate universal perceived brightness, Bp, and universal perceived-chroma, Cp, value data. End-device colorant data associated with the general HSV value data is retrieved for each pixel and scaled using the Bp and Cp value data to obtain scaled end-device colorant data. The scaled end-device colorant data is transmitted to the end device.