Description method of two-dimension equal brightness color gamut

Abstract

The invention discloses a description method of a two-dimension equal brightness color gamut. The description method of the two-dimension equal brightness color gamut includes the following steps of picking out eight peaks of a cube according to the red green blue (RGB) value and the CIELAB value of all boundary points of the RGB cube, sequencing the eight peaks of the cube according to the L* value, judging the cubic sides where the eight peaks belong to and two adjacent surfaces which intersect the equal brightness color gamut, comparing the L* value of nine sample points of each side in order, processing two surfaces, corresponding to the side, of the RGB cube, calculating a certain amount of plane intersection points of the RGB cube, connecting all boundary intersection points of the equal brightness color gamut according to the sequence of hue angles on the RGB cube, obtaining accurate description of the equal brightness color gamut, converting the RGB value of all boundary points on the RGB cube into the CIELAB value, connecting all boundary points on an equal brightness plane in CIELAB space, and obtaining accurate description of boundaries of the equal brightness color gamut. The description method of the two-dimension equal brightness color gamut is simple and high in accuracy.

Description

technical field [0001] The invention belongs to the technical field of image color processing, and relates to a description method of a two-dimensional equal-brightness color gamut. Background technique [0002] The two-dimensional isoluminance color gamut refers to the color gamut range of an image or device under fixed brightness conditions, which is generally described in CIELAB space, specifying the color gamut boundary range of the a*b* plane under the condition of L* value. Describing an accurate two-dimensional isoluminance color gamut can help evaluate the color reproduction capabilities of color devices under certain brightness conditions, and it is also helpful to determine the appropriate output device for the same color image, such as certain overall tone For bright images, try to choose a device with a larger color gamut at a higher L* value, and for a darker image, choose a device with a relatively larger color gamut at a lower L* value, so the description of t...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a description method of two-dimensional equal-brightness color gamut, which solves the problems of large amount of calculation and easy introduction of wrong sample boundary points in the prior art

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