The so-called traditional printing process must do color management, first of all without the use of new wide color gamut ink, new six-color, seven-color or special color printing. Instead, it manages and controls digital color characteristics in sections. The image input includes scanners, digital cameras, etc., using IT / 7-1 or 7-2 as input conditions for transmissive and reflective drafts. Instrument color correction, to achieve that the input image file can correctly capture colors and convert to correct RGB image file. Secondly, establish a mid-screen color correction, hang the sensor on the screen for measurement, start the color management program, and make the luminous color reproduction correction of the screen meet the specified number, but also pay attention to the interference control of the background light. If the same screen color correction is performed in the production factory, remote production equipment screens, and customer proofreading screens, such as X-Rite system calibration, then remote soft proofing can be done, which can be seen on the pre-press screen everywhere The same color image is presented, and the same color output certification operation is performed.
The output equipment includes digital printing, lithographic plate printing, pre-press proof printing and other different stages and methods of output. Today's digital printing, especially inkjet printing, the color gamut and color performance of the color gamut have exceeded the lithographic printing, Using the new generation IT8 / 7-4 color management system, with more than 1500 color grids for more correct color management, color density and chroma color gamut performance can fully meet customer needs, unless gold, silver and fluorescent colors. Therefore, color correction can be kept consistent once a day, but we should pay attention to the changes and responses of different printing media. Lithographic proofing is a print made before lithographic printing. The color correction of IT8 / 7-4 must comply with the actual color reproduction specifications of lithographic printing, including the use of PS version or CTP version, the conditions of the printing press, and the printing production conditions. 〠Ink conditions, media paper conditions, that is, changing the machine, different inks, different papers to different temperature, humidity and pressure conditions, you must make IT8 / 7-4 prints with different color reproduction, and then give back to the proofing for output Only in this way can we print out all kinds of proof colors that meet the customer's approval, otherwise the proofing will be like a wild horse. In the case of wide color density and color gamut, the listed proofs are signed and accepted by the client. However, the printing machine can not print it, and it cannot be produced smoothly.
The stability of the color of the entire batch of printed matter depends on accurate ink discharge, water supply of the printing press, ink supply temperature, humidity stability, offline measurement, online measurement such as Roland Eaqle Eve on-board measurement, to achieve accurate color and defect control goals. Maintain the correct color gamut compression from the front-end to color conversion RGB to CMYK, the stability of CTF plus printing, CTP publishing, the stability of printing materials and printing conditions, often recalibrate the color management characteristics file, so there is a The best pillar of the series.
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