It is recommended that in the printing process, the continuous reconciliation of halftone images is performed by adjusting the density of the dots. By mixing CMYK four-color dots, you can display an infinite number of colors. There are two main types of outlets currently used in the printing process: amplitude modulation (AM) and frequency modulation (FM).
AM outlets
AM sites are currently the most widely used network. Its density of dots is fixed, and the shades of color are expressed by adjusting the size of the dots, thus achieving the transition of tone. In printing, the use of AM sites requires consideration of network size, dot shape, dot angle, and cable accuracy.
Network size
The dot size is determined by the coverage of the dot, also known as the ink rate. Generally speaking, it is customary to use "succeeding" as a unit of measure. For example, a 10% coverage network is called a "10% outlet", an outlet with a 20% coverage is called a "20% outlet", and an outlet with a coverage of 0% is called For "absolute network", the coverage of 100% of the network is called "in the field."
The tone of printed matter is generally divided into three levels: bright tone, mid tone, and dark tone. The dot coverage of the highlighted part is about 10% to 30%; the coverage of the halftone part is about 40% to 60%; and the dark part is 70% to 90%. The net and field parts are additionally divided.
Dot shape
The dot shape in printing is not only a kind of circular shape that everyone imagines. It can be divided into three types: square, round, and rhombus with the shape shown by dots at the 50% inking rate.
Square dots are shaped like chessboards with 50% coverage. Its granules are relatively sharp, and its ability to express levels is strong. Suitable for lines, graphics and some hard-coded images.
In the case of a circular dot, either in the bright tone or in the middle tone, the dots are independent and only partially connected. Therefore, the performance level for the mining level is poor, and it is rarely used in four-color printing.
The diamond-shaped dots integrate the hard-tone of the square dots and the soft-adjustment of the circular dots. The color transition is natural, which is suitable for the performance of general images and photos.
Network point of view
In the printing plate making, the choice of dot angle has a crucial role. Choosing the wrong dot angle will cause interference fringes. The common dot angles are 90 degrees, 15 degrees, 45 degrees, and 75 degrees. The 45-degree network has the best performance, is stable and does not appear dull; the 15 degree and 75 degree angle stability is worse, but the visual effect is not rigid; the 90 degree angle is the most stable, but the visual effect is too rigid There is no beauty.
If two or more types of dots are put together, there will be mutual interference. When the interference is serious enough to affect the appearance of the image, the so-called “rhizard pattern†appears. In general, when the angle difference between the two types of dots is 30 degrees and 60 degrees, the overall interference fringe is still more beautiful; the dot angle difference of 45 degrees is next; when the angle difference between the two dots is 15 degrees and 75 degrees When the interference fringes can damage the image.
AM outlets
AM sites are currently the most widely used network. Its density of dots is fixed, and the shades of color are expressed by adjusting the size of the dots, thus achieving the transition of tone. In printing, the use of AM sites requires consideration of network size, dot shape, dot angle, and cable accuracy.
Network size
The dot size is determined by the coverage of the dot, also known as the ink rate. Generally speaking, it is customary to use "succeeding" as a unit of measure. For example, a 10% coverage network is called a "10% outlet", an outlet with a 20% coverage is called a "20% outlet", and an outlet with a coverage of 0% is called For "absolute network", the coverage of 100% of the network is called "in the field."
The tone of printed matter is generally divided into three levels: bright tone, mid tone, and dark tone. The dot coverage of the highlighted part is about 10% to 30%; the coverage of the halftone part is about 40% to 60%; and the dark part is 70% to 90%. The net and field parts are additionally divided.
Dot shape
The dot shape in printing is not only a kind of circular shape that everyone imagines. It can be divided into three types: square, round, and rhombus with the shape shown by dots at the 50% inking rate.
Square dots are shaped like chessboards with 50% coverage. Its granules are relatively sharp, and its ability to express levels is strong. Suitable for lines, graphics and some hard-coded images.
In the case of a circular dot, either in the bright tone or in the middle tone, the dots are independent and only partially connected. Therefore, the performance level for the mining level is poor, and it is rarely used in four-color printing.
The diamond-shaped dots integrate the hard-tone of the square dots and the soft-adjustment of the circular dots. The color transition is natural, which is suitable for the performance of general images and photos.
Network point of view
In the printing plate making, the choice of dot angle has a crucial role. Choosing the wrong dot angle will cause interference fringes. The common dot angles are 90 degrees, 15 degrees, 45 degrees, and 75 degrees. The 45-degree network has the best performance, is stable and does not appear dull; the 15 degree and 75 degree angle stability is worse, but the visual effect is not rigid; the 90 degree angle is the most stable, but the visual effect is too rigid There is no beauty.
If two or more types of dots are put together, there will be mutual interference. When the interference is serious enough to affect the appearance of the image, the so-called “rhizard pattern†appears. In general, when the angle difference between the two types of dots is 30 degrees and 60 degrees, the overall interference fringe is still more beautiful; the dot angle difference of 45 degrees is next; when the angle difference between the two dots is 15 degrees and 75 degrees When the interference fringes can damage the image.
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