Image processing apparatus
AssigneeSeiko Epson Corporation
InventorsKenji Fukasawa, Makoto Fujino, Yoshihiro Nakami
Life of this patent
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Abstract
CPU 150 performs a matrix operation on image data GD, and then increases the effective digit place number of the color values of the image data GD to increase the tone number of the image data GD from 8-bit tone to 18-bit tone. CPU 150 performs a gamma correction process, a matrix operation N−1M, and an inverse gamma correction process, and then restores the tone number of the image data GD to the original 8-bit tone, and performs automatic quality adjustment. As a result, the 8-bit tone of the original image data GD is preserved throughout image processing, and reproductive color number of the image data GD is preserved as well.
Claims28
An image processing apparatus for performing image processing of image data, said image processing apparatus comprising:
- a color converter for converting by use of a matrix operation image data of a first color system in a first color coordinate system, said first color system capable of representing a first color number, to image data of a second color system in a second color coordinate system, said second color system capable of representing a second color number more numerous than the first color number, while preserving the first color number;
- an image processor for performing image processing on the converted image data in the second color system;
- and
- a reproductive color number reducer for reducing the reproductive color number of image data subjected to the image processing.
An image processing apparatus for performing image processing on image data, said image processing apparatus comprising:
- a first image processor for modifying a color value of the image data represented by an integral value having first effective digits into a first value having a greater place number than the place number of the first effective digits;
- a tone number reduction preventer for preventing reduction of tone number of the image data accompanying modification of color value by the first image processor;
- and
- a second image processor for modifying the color values of image data having the first value from the first value to a second value reflected in image output results.
An image processing apparatus for performing image processing on image data, said image processing apparatus comprising:
- a first color space converter for increasing the tone number of the image data from a first tone number to a second tone number, as well as converting the color space of image data from the YCbCr color space to the sRGB color space;
- a gamma corrector for performing gamma correction on the color space-converted image data;
- a second color space converter for converting the color space of gamma-corrected image data from the RGB color space to a wRGB color space having a wider defined range than the sRGB color space;
- and
- a tone number reducer for restoring tone number of the color space-converted image data from the second tone number to the first tone number.
A computer-readable medium having recorded thereon an image processing program for performing image processing on image data, wherein the image processing program realizes by means of a computer:
- a function for converting by means of a matrix operation image data of a first color system in a first color coordinate system, said first color system capable of representing a first color number, to image data of a second color system in a second color coordinate system, said second color system capable of representing a second color number more numerous than the first color number, while preserving the first color number;
- a function for performing image processing on the converted image data in the second color system;
- and
- a function for reducing the reproductive color number of image data subjected to the image processing.
A computer-readable medium having recorded thereon an image processing program for performing image processing on image data, wherein the image processing program realizes by means of a computer:
- a first image processing function for converting a color value of the image data represented by an integral value having first effective digits into a first value having a greater place number than the place number of the first effective digits;
- a function for preventing reduction of tone number of the image data accompanying modification of color value by the first image processing function;
- and
- a second image processing function for modifying a color value of image data having the first value from the first value to a second value that is reflected in image output results.
A computer-readable medium having recorded thereon an image processing program for performing image processing on image data, wherein the image processing program realizes by means of a computer:
- a first color space converting function for increasing the tone number of the image data from a first tone number to a second tone number, as well as converting the color space of image data from the YCbCr color space to the sRGB color space;
- a gamma correcting function for performing gamma correction on the color space-converted image data,;
- a second color space converting function for converting the color space of gamma-corrected image data from the sRGB color space to a wRGB color space having a wider defined range than the sRGB color space;
- and
- a tone number reducing function for restoring the tone number of the color space-converted image data from the second tone number to the first tone number.
Dependencies are inferred from the claim text.