In the color printing process, the percentage of the final dot is often a large percentage of dots of the color film, which is usually referred to as dot gain. Dot enlargement has a great influence on the color and gradation of the product. In the case of fixed printing conditions, different dot shapes and line numbers are selected. When color separation is set and printing is performed, the condition of the original is fully taken into consideration (eg, The balance of length and color) and the dot changes in the process after color separation, and correct compensation, can get a satisfactory replica.
Dot shapes are numerous, but dot types commonly used in color separation and color desktop systems are square, circular, and chain-shaped. The increase in the tone value of the dot shape in the proofing (or printing) process is different, which means that the longer the perimeter of the dot, the larger the dot enlargement; the smaller the perimeter, the less the expansion. The same amount of ink spreads onto the substrate. The smaller the spreading area, the smaller the dot expansion. Square-shaped outlets expanded to round-type outlets at 50% of outlets, with the largest expansion of outlets. Below 78%, the expansion of outlets was minimal, but it was not conducive to the dark tone of performance. More than 78% of circular outlets were the most likely to absorb ink. The anti-circular outlets (understood as the shape of the blank part after circular overprinting) had the longest perimeter, forming a lap at 22%, with the largest network expansion. Smaller outlets show larger outlets, which is conducive to medium and dark tone levels. The use of counter-circles and circular nets for color separation, standard grayscale scales for hanging nets, and high-optical compression for counter-circular dots, with a good middling tone. In printing, high light areas (ie, small outlets) are subject to change in printing pressure or exposure to a large number of printing plates, resulting in high light areas that are susceptible to ink (ie, the loss of small outlets). Small outlets need to be solid, blackness is high, and printing exposure is high. To be correct, the printing pressure should be adjusted well. Small outlets have good ink properties, which will greatly increase the original high-capacity capabilities of the printed products and reduce the loss of the high-light areas. When the outlets overlap, they should be consistent with the tonality of the manuscript, and the dot expansion should be as small as possible. Dark spots 80%-97% of the outlets should not be too early, too much ink, to ensure the transfer rate of ink transfer process, control network expansion. The use of technologies such as FM network, make the network as far as possible to achieve the ideal network standards.
The number of screens for four-color prints is based on the surface properties of the paper used in the print. The number of coated lines on the coated paper can be higher, and the number of lines on the offset paper is lower. The thin network line has a much larger value than the coarse network line. It is more obvious than the increase value at the beginning of different network points. The increase value of the FM network point is larger than the amplitude modulation. The dot gain value is the upper tone value of the printed matter minus the corresponding gradation value on the color separation sheet. Correct compensation in plate separation and printing is to ensure and improve product quality.
With the same number of outlets, the percentage of outlets with different percentages of outlets is: 10% to 50% of outlets. With the increase in the percentage of original outlets, the percentage of print outlets will increase gradually, the expansion rate of outlets will also increase, and the ratio of square outlets will increase. There is a large increase in the number of circular dots. From 50% to 90% of outlets, with the increase of the percentage of original outlets, the percentage of printing outlets has gradually decreased, and the reduction of square outlets has been larger than that of round outlets. From 10% to 90% of the outlets, as the percentage of the original outlets increases, the percentage of the outlets of the outlets gradually decreases, and the square outlets have a larger reduction than the round outlets.
The rule that the percentage of outlets is the same and the number of outlets is different is that the higher the number of outlets, the greater the percentage expansion of the outlets of the products, and the greater the expansion rate of the outlets, and the larger the square outlets than the round outlets. The smaller the percentage of outlets and the higher the number of outlets, the larger the percentage expansion of printing outlets, and the greater the expansion rate of outlets, and the larger the square outlets than circular outlets. The higher the number of dot lines, the larger the percentage of area where printing dots expand, and the larger dot size of square dots than round dots. The smaller the percentage of outlets is, the higher the number of outlets is, and the greater the percentage of printing outlets is, the larger the square-shaped outlets are than the round outlets.
As long as we select different platemaking technologies according to different manuscripts, control the size of outlets, the proportion of outlets, and the change of outlets (ie, the expansion of outlets), according to the suitability of printing, proper printing, and the correct dot compensation, we can grasp the law of dot expansion. , we can guarantee and improve the quality of printing and improve the economic efficiency of enterprises.
Dot shapes are numerous, but dot types commonly used in color separation and color desktop systems are square, circular, and chain-shaped. The increase in the tone value of the dot shape in the proofing (or printing) process is different, which means that the longer the perimeter of the dot, the larger the dot enlargement; the smaller the perimeter, the less the expansion. The same amount of ink spreads onto the substrate. The smaller the spreading area, the smaller the dot expansion. Square-shaped outlets expanded to round-type outlets at 50% of outlets, with the largest expansion of outlets. Below 78%, the expansion of outlets was minimal, but it was not conducive to the dark tone of performance. More than 78% of circular outlets were the most likely to absorb ink. The anti-circular outlets (understood as the shape of the blank part after circular overprinting) had the longest perimeter, forming a lap at 22%, with the largest network expansion. Smaller outlets show larger outlets, which is conducive to medium and dark tone levels. The use of counter-circles and circular nets for color separation, standard grayscale scales for hanging nets, and high-optical compression for counter-circular dots, with a good middling tone. In printing, high light areas (ie, small outlets) are subject to change in printing pressure or exposure to a large number of printing plates, resulting in high light areas that are susceptible to ink (ie, the loss of small outlets). Small outlets need to be solid, blackness is high, and printing exposure is high. To be correct, the printing pressure should be adjusted well. Small outlets have good ink properties, which will greatly increase the original high-capacity capabilities of the printed products and reduce the loss of the high-light areas. When the outlets overlap, they should be consistent with the tonality of the manuscript, and the dot expansion should be as small as possible. Dark spots 80%-97% of the outlets should not be too early, too much ink, to ensure the transfer rate of ink transfer process, control network expansion. The use of technologies such as FM network, make the network as far as possible to achieve the ideal network standards.
The number of screens for four-color prints is based on the surface properties of the paper used in the print. The number of coated lines on the coated paper can be higher, and the number of lines on the offset paper is lower. The thin network line has a much larger value than the coarse network line. It is more obvious than the increase value at the beginning of different network points. The increase value of the FM network point is larger than the amplitude modulation. The dot gain value is the upper tone value of the printed matter minus the corresponding gradation value on the color separation sheet. Correct compensation in plate separation and printing is to ensure and improve product quality.
With the same number of outlets, the percentage of outlets with different percentages of outlets is: 10% to 50% of outlets. With the increase in the percentage of original outlets, the percentage of print outlets will increase gradually, the expansion rate of outlets will also increase, and the ratio of square outlets will increase. There is a large increase in the number of circular dots. From 50% to 90% of outlets, with the increase of the percentage of original outlets, the percentage of printing outlets has gradually decreased, and the reduction of square outlets has been larger than that of round outlets. From 10% to 90% of the outlets, as the percentage of the original outlets increases, the percentage of the outlets of the outlets gradually decreases, and the square outlets have a larger reduction than the round outlets.
The rule that the percentage of outlets is the same and the number of outlets is different is that the higher the number of outlets, the greater the percentage expansion of the outlets of the products, and the greater the expansion rate of the outlets, and the larger the square outlets than the round outlets. The smaller the percentage of outlets and the higher the number of outlets, the larger the percentage expansion of printing outlets, and the greater the expansion rate of outlets, and the larger the square outlets than circular outlets. The higher the number of dot lines, the larger the percentage of area where printing dots expand, and the larger dot size of square dots than round dots. The smaller the percentage of outlets is, the higher the number of outlets is, and the greater the percentage of printing outlets is, the larger the square-shaped outlets are than the round outlets.
As long as we select different platemaking technologies according to different manuscripts, control the size of outlets, the proportion of outlets, and the change of outlets (ie, the expansion of outlets), according to the suitability of printing, proper printing, and the correct dot compensation, we can grasp the law of dot expansion. , we can guarantee and improve the quality of printing and improve the economic efficiency of enterprises.