CN1298799A

CN1298799A - Digital colour draft design before desktop printing

Info

Publication number: CN1298799A
Application number: CN 99114597
Authority: CN
Inventors: 蒋国华
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-12-06
Filing date: 1999-12-06
Publication date: 2001-06-13
Anticipated expiration: 2019-12-06
Also published as: CN1163361C

Abstract

The present invention relates to a colour digital code drafting technology of printing machine. It is characterized by that use computer to process CMYK colour pattern into colour divided postscript file corresponding to C, M, Y, K respectively and containing four colour plates or colour divided PDF grey scale file, then sent to printing machine to complete colour composite printing on same paper for four times under the control of printing driving program. Advantages: accurate colour restoring, able to produce monocolour printing draft after colour division treatment, and suitable for use on different printing machine, particulary for low-grade RGB printing machine.

Description

Digital colour draft design before desktop printing

The present invention relates to a kind of number that is used for colored prepress workflow technology of working out a draft.

At present, domestic and international employed color printer, mostly be the RGB mode greatly, though printhead has 4 looks, 6 looks, even 7 look, but internal interpretation all is RGB patterns, finish in a mode during printout, its shortcoming is that colour is too saturated, can not correctly reduce the color of CMYK image, and it is high, middle-grade color printer, adopt PostScript pattern or PostScript emulation to print, this can solve the colour reproduction problem of CMYK hard copy to a certain extent, but this printing type is to be based upon on the not full ripe at present CIE color management mode, the CMYK pattern is transferred to the Lab pattern of CIE in print procedure, ICC characteristic file by printer converts the data that printer is accepted to then, and its accuracy of printing color depends on the correctness of ICC characteristic file.Because the foundation of ICC characteristic file is relevant with the performance of the performance of each producer's printer itself, pad-ink, and the foundation of common ICC characteristic file only is to be based upon on the basis of tens color lump color corrections, the printer of general performance do not reach complete colour reproduction, so can not be applicable to the preceding digital colour draft design of seal.Existing proof press such as happy quick letter heat sublimation work out a draft the Approvd XP proof press of machine, Kodak, a small amount of several brands such as Po-laproof proof press of Polaroid company, its exquisite manufacture craft level, the color management system that carries are in addition to the meticulous correction of ICC characteristic file, color effect has almost reached and has been the printing degree that the circle accepted, but very important problem is, its equipment and software price are very high, generally all ten thousand dollars of 8-20, be not that each company all has this financial resources and buys, the ratio of performance to price is undesirable.

The purpose of this invention is to provide a kind of energy should be in basic, normal, high shelves printer, and can reach colour reproduction effect accurately, and can reduce the work out a draft colour print technology of (sample) cost of colour before the seal significantly.

The present invention uses the PostScript file (but common RIP is construed to four black and white pages corresponding to blue C, pinkish red M, yellow Y, black K) or the pdf document of color separation of color separation (to be made up of four continuous black and white pages usually, correspond respectively to blue C, pinkish red M, yellow Y, black K) as the source file of seal front desktop digital colour draft design (sample), on sheet-fed, print color proof compound or stack with four look stamping inks (blue C, pinkish red M, yellow Y, black K).The evident characteristic that unique printing type of use " color separation is compound again " is arranged.

The objective of the invention is to realize by following technical solution:

Colour print technology of the present invention comprises following processing step:

(1) at first with the CMYK color pattern by computer by group version file process become to contain 4 look versions respectively with the PostScript file or the PDF gray scale file of C, M, the corresponding color separation of Y, K;

(2) this PostScript file or PDF gray scale file are transported to color printer, by being organized in first look version page of the above-mentioned gray scale file of print driver control printer prints in the printer, promptly with corresponding first page of C (blue look);

(3) printer resets hard copy after under print driver control first page print being finished, and promptly returns original position;

(4) printer is printed second look version page of aforementioned gray scale file, more promptly with the corresponding page of M (magenta) under print driver control; (3) printer has been printed the hard copy that finishes with second page and has been resetted then set by step;

(5) printer is printed the 3rd the look version page of aforementioned gray scale file again under print driver control, and promptly with the corresponding page of Y (yellow), the hard copy after (3) printer finishes the 3rd page print then set by step resets;

(6) printer is printed the 4th the look version page of aforementioned gray scale file again under print driver control, and promptly with the corresponding page of K (black), after printing finished, hard copy formed the composite printing original text output of CMYK color pattern.

Advantage of the present invention is: 1. this technology is based upon on PostScript file or the pdf document printing basis, go out film with RIP to film setter identical uniformity is arranged, owing to adopt the pdf document of the gray scale of the PostScript gray scale file of same color separation or same color separation, overcome before the existing seal number and worked out a draft to go out film with phototypesetting and carry out the inconsistent shortcoming of printing color.2. this technology has been skipped existing color management method, only is the basic function of using the reducible linear gray image of printer (figure), has reached CMYK colour print reduction.3. this technology is followed the PostScript or the PDF industrial standard of Adobe company, with the PDF file of the PostScript of color separation or the color separation source file as color digital printing.4. this technology is preferentially used the gray scale file of the PDF of color separation, this document can form from being used in the PostScript file distillation of color separation that phototypesetting goes out C, M, Y, the K form of film, 5. for this technology, print 4 gray scale pages of the PDF file of the PostScript file of color separation or color separation, all can obtain the halftone dot image of the corresponding different depths, can obtain corresponding monochrome image original text as printing respectively, as change the printing ink of different colours, paper does not change, and just can obtain colored composite printing sample manuscript on former paper.6. because this printing technology is subjected to the influence of equipment less, make existing low-grade RGB printer adopt this technology also can produce comparatively ideal colour print effect.

Claims

1, digital colour draft design before desktop printing comprises following processing step:

(1) computer with the CMYK color pattern by group version file process become to contain 4 look versions respectively with the PostScript file or the PDF gray scale file of C, M, the corresponding color separation of Y, K;

(2) this PDF gray scale file is transported to color printer, by first look version page that is organized in the above-mentioned gray scale file of print driver control printer prints in the printer, promptly with corresponding first page of C (cyan);

(4) printer is under print driver control, second look version page printing aforementioned gray scale file again promptly with the corresponding page of M (magenta); (3) printer has been printed the hard copy that finishes with second page and has been resetted then set by step;

(5) printer is printed the 3rd the look version page of aforementioned gray scale file again under the control of print driver, promptly with the corresponding page of Y (yellow); Hard copy after (3) printer finishes the 3rd page print then set by step resets;

(6) printer is printed the 4th the look version page of aforementioned gray scale file again under print driver control, promptly with the corresponding page of K (black), prints the composite printing original text output that the back hard copy that finishes forms the CMYK color pattern.