Several problems with the output and how to identify the number of outlets

What kind of light-sensitive material does laser photocopying use? What should pay attention to in the processing?

The use of photosensitive materials for laser photoprinting is generally full-color film, and is used more often in China by the "Huaguang" brand laser photo film. According to the requirements of the printing plate, the requirements of the film are that the word blackness is large and uniform, the strokes are clear, the background color is white and fog-free, there are no dirt spots on the film, there are no scratches on the film, and the blackness of the entire book film is the same. Therefore, we must first pay attention to the shelf life of the film in the flushing, and those who exceed the shelf life have a large degree of fog. Second, according to the film used to prepare the corresponding developer, in strict accordance with the order of preparation of their formulations, the developer should be clean, the development temperature can not be too high, it can not be too low (too high will produce fog, too low or too slow development Development time is too long, will increase the film base fog can not reach black level), the temperature is generally 25 ~ 35 °C. Finally, pay attention to the fixing is sufficient, otherwise it will affect the film quality and save time.

What are the highlights, midtones, and shadows?

Brightness refers to the part of the original or printed matter that reflects relatively strong light and the colors are compared. The density value is between 0.2 and 0.6, and less than 0.2, it belongs to the highlight or extremely bright part. Slight adjustment refers to the part of the original or printed material that reflects relatively weak light and has a darker color. The density value is greater than 1.05. The midtone is the portion of the original or printed matter that is between the bright and dark shades, with a density value of 0.6 to 1.05.


What are the functions of outlets and how do you use outlets to reflect the tones of prints?

The outlets are the basis of the printing and copying process, and they are the basic units that make up the graphic and text. The functions of the outlets are:

1. The tasks of coloring, lightness and saturation in the printing effect;

2. It is the smallest unit of fat and water repellent, and it is the basic element of image transmission.

3. In color synthesis is the organizer of image colors, layers, and outlines.

The dots on the printed matter are formed by electronic scanning. The amount of reflected light is proportional to the size of the dot. Huang, Pin, Qing, and Black four-color versions each use the different dots of 100% of o% to reflect the color content. For example, the yellow version is in the red area, and its dot ratio is between 90% and 100%. If it is orange, the yellow version is a smaller percentage.

Such as: Y100% + M100% = red. M100% ten C80% = red violet. Y50%+M100%= Orange. M100%+C50%=light purple. Y10%+M100%= Near Magenta. M100%+C10%=The percentage of different dots in rose red superimposes different colors.

The size of the dot not only represents the brightness and saturation of the color, but also represents the gradation and outline of the picture.

What are the differences between chain and square outlets in use? What are the differences in the perspectives of scenes and figures?

When the number of chain outlets is generally 70%, the gap between the outlets is the smallest and the expansion rate is the largest; when the outlets of square outlets are at 50%, the gap is the smallest and the expansion rate is the largest. Therefore, when making figures, since most of the faces are about half of the dots, it is best to use chain-type dots to avoid the expansion of 50 percent. When making scenery maps, you can use square points or chain points.

The 45° dot angle gives people the utmost comfort. Therefore, the general scenery chart based on blue-green, the best version of the Qing do 45 °; character map based on yellow-red, the best version of the magenta version to do 45 °, so that the version of the effect will be good .

How to identify the number of outlets?

There are two methods to identify the dot number: one is to use the density meter to measure the integral density of the dot, and then convert it into a percentage of dot area, such as: the dot density of the dot is 0.3, then the dot area is 50%. The method is more scientific and accurate; the other method is to use a magnifying glass to visually measure the ratio of the dot area to the blank area. This method is more intuitive and convenient, but due to experience, the error is large, specifically: if there is a gap between two dots Area can accommodate 3 outlets, which is 1 percent; 2 outlets, 2 percent; 1 outlet, 3 percent; 1 outlet, 4 percent; just 1 outlet. 5 points; and 6 points or more, it is to count the number of blank points between two blank points, that is, 6 points can accommodate 1 blank point, 7 points can accommodate 1 blank, 8 points can accommodate 2 blank points, 9 points can accommodate 3 blank points.


What is a moire and how can I avoid it?

Turtle refers to an unpleasant web pattern that appears in the proof or printing due to the improperly matched angle of the positive plate.

Avoid methods include:

1. The screen angle difference between strong red, green and black plates must be not less than 30° and the yellow plate is set at 90°;

2. Do not darken the light-colored ink when there is a light-colored version;

3. When using printed matter as originals, the screen angle chosen for each color version should be offset from the corresponding screen angle on the original. For example, the original version is 90° in yellow, magenta is 75°, cyan is 15°, and black is 45°. Can be used in yellow 45°, magenta 30°, cyan 60°, and black 90°.

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