One way to measure and determine the density of printed dot spots is to use a densitometer to measure the dot density of dots, and then convert it into a percentage of dot area. This method is more scientific and accurate;
Another method is to use a magnifying glass to visually measure the ratio of the dot area to the blank area. If between two dots (including black dots or white dots) can fill in three dots of the same size, this dot size is called " 10%." If you can fill in two equally sized dots, it is called "20%." If you can fill in a half of the same size, it is called "30%." If you can fill in 1.25 equally-sized mesh points, it is called "40%." The black and white half of the network is "50%", and 50% of the Internet points is just the opposite of what was previously stated. This method is relatively intuitive and convenient, but due to experience, the error is large.
Dot shape
There are many shapes of dots, such as circles, ovals, squares, chains (diamonds), crosses, diamonds, lines, spreads, and other special shapes; the most commonly used dot shapes are round, square, and In the chain, the following describes the characteristics and properties of these types of dots:
1, circular outlets
When circular screens display the screen level, high-profile and mid-tone dots are all juxtaposed. Only when dark tone begins to appear edge-over phenomenon, when the percentage of dots is approximately 78%, the perimeter of circular dots is the longest. When the dot gain rate was the largest, outlets began to appear overlapping, and the density caused by the overlap rose suddenly. A “jump†will appear when the tone level is expressed. Thus, the wave breaks the continuity of the tone curve, resulting in a loss of gradation in the tone region.
The high and middle levels of circular dots can be well preserved, while dark dots are easy to merge.
There are many circular outlets in actual use, but some improvements have been made to the outlets in actual use. Many prints use the “Euclidean†shape (in Photoshop software, they are still called “Euclidean†outlets). The shape ")" dot is a square at 50% of the area rate, and the bright tone is a circle. Although the dark tone dot is also a circle, it is different from the pure circle dot in dark tone, and its dot gain is improved.
2, square outlets
The outlets are square, and the perimeter of the outlets is the largest at 50% of the outlets, and they begin to produce laps. At this time, the outlets gain the most and are prone to skipping.
Square outlets have a strong ability to reflect levels, and have richer screen tones. However, the middle tone is not soft, the level of transition is poor, and the performance is not good.
3, chain outlets
Chain-shaped dots are also known as diamond dots, and the dots are particularly marked as chains. Therefore, chain-shaped dots, diamond-shaped dots are different in long-axis diagonal and short-axis diagonal, and they are diamond-shaped. When the long axis begins to take a corner, the short axis has no angle. When the short axis begins to take a corner, the long axis has already taken a corner. Therefore, the comparison of a chain-shaped dot with a square dot is equivalent to decomposing one leap from the dot to two jumps. The percentage of dots on the long axis is about 35%, and the percentage of dots on the short axis is about 65%. The level of jumping is not so obvious.
The chain-shaped dot screens are particularly soft and reflect a rich hierarchy.
The tempo jump caused by the lap of the network can be overcome in principle by adjusting the adjustment parameters of the RIP. However, the amplitude of the hop has a lot of factors. There is randomness within a certain range, and the position of the hop can only give a range. It is difficult to pinpoint precisely. Even with careful presupposition, it is difficult to offset all the defects; therefore, the gradation jump caused by the overlap of the dots can hardly be eliminated in actual production, and can only be mutually influenced by the shape of the dots and the characteristics of the images produced. Collaborate to reduce its impact.
The combination of outlets has always been a concern in the industry in recent years. A number of powerful companies have competed to launch their own outlets or through their own software and equipment to improve the quality of printed matter and maintain their industry. leading position. The combination of the use of various shapes of dots, frequency conversion dots and other technologies all make the original image suitable for its characteristics more reproducible.
Another method is to use a magnifying glass to visually measure the ratio of the dot area to the blank area. If between two dots (including black dots or white dots) can fill in three dots of the same size, this dot size is called " 10%." If you can fill in two equally sized dots, it is called "20%." If you can fill in a half of the same size, it is called "30%." If you can fill in 1.25 equally-sized mesh points, it is called "40%." The black and white half of the network is "50%", and 50% of the Internet points is just the opposite of what was previously stated. This method is relatively intuitive and convenient, but due to experience, the error is large.
Dot shape
There are many shapes of dots, such as circles, ovals, squares, chains (diamonds), crosses, diamonds, lines, spreads, and other special shapes; the most commonly used dot shapes are round, square, and In the chain, the following describes the characteristics and properties of these types of dots:
1, circular outlets
When circular screens display the screen level, high-profile and mid-tone dots are all juxtaposed. Only when dark tone begins to appear edge-over phenomenon, when the percentage of dots is approximately 78%, the perimeter of circular dots is the longest. When the dot gain rate was the largest, outlets began to appear overlapping, and the density caused by the overlap rose suddenly. A “jump†will appear when the tone level is expressed. Thus, the wave breaks the continuity of the tone curve, resulting in a loss of gradation in the tone region.
The high and middle levels of circular dots can be well preserved, while dark dots are easy to merge.
There are many circular outlets in actual use, but some improvements have been made to the outlets in actual use. Many prints use the “Euclidean†shape (in Photoshop software, they are still called “Euclidean†outlets). The shape ")" dot is a square at 50% of the area rate, and the bright tone is a circle. Although the dark tone dot is also a circle, it is different from the pure circle dot in dark tone, and its dot gain is improved.
2, square outlets
The outlets are square, and the perimeter of the outlets is the largest at 50% of the outlets, and they begin to produce laps. At this time, the outlets gain the most and are prone to skipping.
Square outlets have a strong ability to reflect levels, and have richer screen tones. However, the middle tone is not soft, the level of transition is poor, and the performance is not good.
3, chain outlets
Chain-shaped dots are also known as diamond dots, and the dots are particularly marked as chains. Therefore, chain-shaped dots, diamond-shaped dots are different in long-axis diagonal and short-axis diagonal, and they are diamond-shaped. When the long axis begins to take a corner, the short axis has no angle. When the short axis begins to take a corner, the long axis has already taken a corner. Therefore, the comparison of a chain-shaped dot with a square dot is equivalent to decomposing one leap from the dot to two jumps. The percentage of dots on the long axis is about 35%, and the percentage of dots on the short axis is about 65%. The level of jumping is not so obvious.
The chain-shaped dot screens are particularly soft and reflect a rich hierarchy.
The tempo jump caused by the lap of the network can be overcome in principle by adjusting the adjustment parameters of the RIP. However, the amplitude of the hop has a lot of factors. There is randomness within a certain range, and the position of the hop can only give a range. It is difficult to pinpoint precisely. Even with careful presupposition, it is difficult to offset all the defects; therefore, the gradation jump caused by the overlap of the dots can hardly be eliminated in actual production, and can only be mutually influenced by the shape of the dots and the characteristics of the images produced. Collaborate to reduce its impact.
The combination of outlets has always been a concern in the industry in recent years. A number of powerful companies have competed to launch their own outlets or through their own software and equipment to improve the quality of printed matter and maintain their industry. leading position. The combination of the use of various shapes of dots, frequency conversion dots and other technologies all make the original image suitable for its characteristics more reproducible.
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