The mystery of GCR achromatic structure in digital prepress production
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In the printing industry of modern China, commercial rotary printing has sprung up. The launch of commercial rotary machines is to raise commercial printing to a higher level. It adapts to the requirements of the modern printing market with its shorter production cycle, large batch size and high quality, fast and efficient characteristics. With the standardization of the working environment and machine operation, the quality control of prepress production plays a decisive role in the rotary printing. If the previous work is not in place, the prepress production is not suitable for commercial rotary printing, which will result in the delay of the genuine rate and the waste of paper, which will seriously affect the printing quality and timeliness of its products. To give full play to the advantages of commercial rotary printing, prepress production that meets actual needs is indispensable.
High-speed commercial rotary presses generally use web printing, the paper path is relatively long, the physical and optical properties of the paper surface are not very uniform, mainly rely on drying to accelerate ink drying, and the pre-press design has different requirements than lithographic offset printing and newsprint offset printing. .
GCR (short for Grey CompOnent Replacement) refers to the non-color value of the complex color area which is overprinted or mixed with the three primary color inks in color image reproduction, and can be replaced by the ink color ink which is equal to the weakest color among the three primary colors, and Get the same visual effect.
In the actual production process, sometimes the merchandise news (DM) of some hypermarkets is difficult to adjust, especially for large-scale dark adjustments or on-the-spot parts. The reason is that the Y, M, and C versions are too heavy to reach neutral. Gray balance, after many practices, found that the yellow, fine, and blue versions are deep, not only the ink color is difficult to print, easy to paste and is not conducive to registration.
In the front-end production, you must use GCR technology to increase the depth of the black version, replace the neutral gray with black, and reduce the amount of ink used by other colors. As long as the black version is normal, other color versions use fine fluctuations in the amount of ink. Colors are also easy to maintain, thanks to the skeleton of the black version. By reducing the amount of color ink, it is not only easy to achieve sample requirements, but also reduces production costs.