Abstract The present invention is directed to a method of processing a color video signal in which printing color separation data is formed from a color video signal and a printing original plate (4) is made by using the printing color separation data. This color video signal processing method is comprised of the steps of reading out a reference color test chart (4) by a printing scanner (6) and producing scanner four color separation data of the reference color test chart (4) by the printing scanner (6), taking a picture of the reference color test chart (4) radiated by a standard light source (5) by a video camera (1, 2), producing camera four color separation data from a color video signal output from the video camera (1, 2), comparing the scanner four color separation data with the camera four color separation data and allowing a level difference therebetween to be stored in a memory as correcting data which is used to correct the camera four color separation data, and correcting the four color separation data by the correcting data stored in the memory to thereby produce four color separation data when the four color separation data for making the printing original plate (4) are generated from a color video signal of the video camera (1, 2). Therefore, a printing original plate (4) having satisfactory color reproducibility can be produced by utilizing the video camera (1, 2).
A method of processing a color video signal in which printing color separation data is formed (12) from a color video signal and a printing original plate is made (3) by using said printing color separation data, comprising the steps of: (a) reading out a reference color test chart (4) by a printing scanner (6) and producing (7) scanner four color separation data of said reference color test chart (4) by said printing scanner (6); (b) taking a picture of said reference color test chart (4) radiated by a standard light source (5) by a video camera (1, 2); (c) producing (12) camera four color separation data from a color video signal output from said video camera (1, 2); (d) comparing (13) said scanner four color separation data with said camera four color separation data and allowing (14) a level difference therebetween to be stored in a memory as correcting data which is used to correct said camera four color separation data; and (e) correcting said four color separation data by said correcting data stored in said memory to thereby produce four-color separation data when said four color separation data for making said printing original plate are generated from a color video signal of said video camera (1, 2).
Claim 2
Dependent Claim
19 words
The method according to claim 1, wherein said color test chart is a transparent type color test chart (4).
Claim 3
Dependent Claim
42 words
The method according to claim 1 or 2, wherein a color separation data signal of three primary colors is generated from said video camera (1, 2) and said four color separation data are obtained (12) from said three primary color data signal.
Claim 4
Independent Claim
227 words
A system of processing a color video signal in which printing color separation data is formed from a color video signal and a printing original plate is made by using said printing color separation data, comprising: (1) a printing scanner (6) for reading out a reference color test chart (4) and outputting four color separation data which are used to make a printing original plate; (2) a video camera (1, 2) for taking a picture of said reference color test chart (4) radiated by a standard light source (5) to thereby output a color video signal; (3) four color separation data generating means (11, 12) for generating four color separation data from said color video signal output from said video camera (1, 2); (4) comparing means (13) for comparing said four color separation data from said printing scanner (6) with said four color separation data generated from said color video signal; and (5) correcting data generating means (14, 15) for generating correcting data on the basis of a difference information obtained from said comparing means (13), wherein said color video signal from said color video camera (1, 2) is corrected by using said correcting data to thereby produce four color separation data when said four color separation data for making said printing original plate are generated from a color video signal of said video camera (1, 2).
Claim 5
Dependent Claim
19 words
The system according to claim 4, wherein said color test chart is a transparent type color test chart (4).
Claim 6
Dependent Claim
41 words
The system according to claim 4 or 5, wherein a color separation data signal of three primary colors is generated from said video camera (1, 2) and said four color separation data are obtained from said three primary color data signal.
Claim 7
Independent Claim
27 words
The system according to anyone of claims 4 to 6, wherein said correcting data generating means (14, 15) is composed of a memory having a conversion table.
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