Method of effecting gradation and color correction of a composite image
First Claim
1. A method of correcting the gradation of a composite image of a human subject image and a computer graphic image to be printed, comprising the steps of:
- making a gradation correction of image signals of a human subject image with a gradation correcting table data;
making a gradation correction of image signals of a computer graphic image with a gradation correcting table data which is different from said gradation correcting data for said human subject image; and
composing said image signals of said human subject image and computer graphic image as video signals at one of before and after said correction of gradation of said human subject image and computer graphic image.
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Accused Products
Abstract
A method of making color and gradation correction performs color and gradation correction differently for a human subject image and a computer graphic image before or after composing these images. A gradation correction is carried out by the use of linear table data written in a look-up table for computer graphic images and non-linear table data for human subject images. A color correction circuit for transforming image data by the use of a matrix calculation comprises three look-up table memories and an adder for adding together outputs from the look-up table memories for each color to be color corrected. In these three look-up table memories, different table data are written in, according to the kinds of human subject image and computer graphic image. There are provided a plurality of different table data for human subject images and computer graphic images, respectively and suitable table data are selected according to a human subject image and a computer graphic image to be composed.
58 Citations
14 Claims
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1. A method of correcting the gradation of a composite image of a human subject image and a computer graphic image to be printed, comprising the steps of:
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making a gradation correction of image signals of a human subject image with a gradation correcting table data; making a gradation correction of image signals of a computer graphic image with a gradation correcting table data which is different from said gradation correcting data for said human subject image; and composing said image signals of said human subject image and computer graphic image as video signals at one of before and after said correction of gradation of said human subject image and computer graphic image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of correcting the color balance of a composite image of a human subject image and a computer graphic image, comprising the steps of:
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electrically composing a human subject image and a computer graphic image at one of before and after making a correction of color and gradation of said human subject image and said computer graphic image; and making a color correction of said human subject and computer graphic images by the use of the following color correction matrix formula with different coefficient matrices for said human subject and computer graphic images;
##EQU7## where R, G, B;
image signal for red, green, blue after color correctionRO, GO, BO;
image signal for red, green, blue before color correctiona1, a2, a3, b1, b2, b3, c1, c2, c3;
are coefficients. - View Dependent Claims (13, 14)
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Specification