Expansion of outlets (center)

Specific use is as follows:
1. The GATF digital signal bar assumes that the coarse net does not change and the dot does not expand. Observe the difference in density between the digits and the ground color with the naked eye.
2. In the original version, the area of ​​1-7 digital dots was successively reduced by 3%-5%, and 7-9 was decremented by more than 5%. The area of ​​No. 0 dot was the largest, and that of No. 9 dot was the smallest.
3. Since it is assumed that the coarse wire does not expand at all, the dot gain is determined based on the same digital and background density.
Example 1: Digital 5 has the same background density. At this time, from the beginning of data 2, the digital transfer has three levels of printing dots (a reference with 2 as the fixed dot does not expand, and the transfer is reduced by 3%-5% for 3 levels). Digital 5 has expanded its network by 9%-15%.
Example 2: The number of GATF signal bars is 1, which is the same as the background color density. Digital 2 is used as a reference and the transfer is made in one stage. The dot size is reduced by 3%-5%.
Using data 2 as a reference, 2 used to be a narrowing of outlets, followed by an expansion of outlets.
The star's dot control emits 36 black and white wedge lines of equal width outward from the center of the circle, with a small whiteness at the center of the circle.
Stars are based on the size of the central white point to determine the size of the dot expansion.
The central white spot is large, indicating that the dot expansion is small.
The large white center point indicates that the outlets have been enlarged.
As a testing tool for testing dot gains, the role of the star is to be able to identify the type of dot gain.
1. The white spot in the center of the star sign is oval, indicating that the outlets have directional expansion. When the center white dot of the star sign shows "→0 ←", this type of ellipse indicates that the net point is expanded to the left and right, which is called horizontal expansion; the dot network shows that the "O" is called an up and down expansion network. Or called vertical expansion.
2. If there is ghosting at the center of the star, the small white point in the middle will not only become smaller, but also appear as an "8" or "∞" shape, which indicates that the dot ghosts and ghosts will appear.
In summary, the feature of the GATF data signal strip is that it can provide a data. Dot gains give a quantitative amount, and stars can identify the types of dot gains. Both have their own uses and benefits, and they can be used to complement each other.
Fourth, the test strip control network expansion In the printing and printing process, test strips control the expansion of the printing outlets, Bruner test strip, respectively, speaking, the most widely used.
The composition of the Bruner test strip:

50% 50% 75% 75% Fine Thickness

Fine: Indicates a fine dot: Indicates that the bold dot Brunner test strip remains unchanged and does not expand as a reference.
The calculation of outlet expansion is based on the comparison segment with the coarse network cable as a reference. The coarse and fine mesh of the Bruner test strip are respectively 30 lines/inch and 150 lines/inch. Therefore, the 30-line/inch coarse network segment is ignored and the 30-line/inch coarse network is not expanded.
2, using the density and dot area of ​​the characteristic curve according to DR = tg1/1-a
a=1-10 -DR
The density value is equal to the area difference.
When testing with the Bruner test strip, use a density meter to measure the coarse mesh first, then measure the fine mesh, and then use the fine mesh-rough mesh = dot gain value.
Brunner's calculation method for dot gain 1. Select 50% of the test points for dot gain = (fine net density - coarse net density) × 100% = D fine - D thick (where: D denotes density) (to be continued)