Image processing method and device for performing grayscale conversion, and image processing program

摘要

Disclosed are an image processing method and device and an image processing program that are able to perform gradation conversion—that achieves a favorable saturation reproduction when exchanging and reproducing images between devices or between color spaces having different dynamic ranges—by element of having: a first gradation conversion that, when converting gradation characteristics of image data of an image, converts first gradation characteristics using a one-dimensional first lookup table corresponding to the RGB pixel data of the image; and a second gradation conversion that converts the RGB pixel data of the image to chromaticity data and luminescence data or lightness data, and that converts second gradation characteristics of the converted luminescence data or lightness data using a one-dimensional second lookup table corresponding to the luminescence data or lightness data; and then weighting the first gradation conversion and the second gradation conversion.

主权项

1. An image processing method adapted to convert grayscale characteristics of image data of an image, comprising:
first grayscale conversion which performs first grayscale characteristics conversion using a first lookup table of one-dimensional type corresponding to RGB pixel data of the image; and second grayscale conversion which converts the RGB pixel data of the image into luminance data or lightness data and chromaticity data, and performs second grayscale characteristics conversion on the thus converted luminance data or lightness data using a second lookup table of one-dimensional type corresponding to the luminance data or lightness data, wherein weighting to the first grayscale conversion and the second grayscale conversion is performed.