The sinusoidal plate-making and printing sinusoidal plates are used to photograph the stencils to be copied as a negative image negative film and dried on a glass plate coated with a photosensitive resin. The printing of the Feiluo printing can be achieved with a real copy effect, which is unmatched by other printing methods. The process of production process is: manuscript - photography - revision - printing - printing. According to their own work practices, they are introduced as follows:
First, the copy of black-and-white monochrome photos is the use of cameras to shoot negatives. There are the following requirements for making negative plates in the reproduction:
(1) Since the light gray tone and the bright tone or the background color contrast in the drawing are small, the photographic film should be selected as a special hard SP film. This kind of film has a large contrast, which helps to open up the contrast between bright and shallow layers. Do not use lens aperture too large. Copy the original large works, F32 aperture is more appropriate, photo film negative film density value of 0.2-0.4 is the best.
(2) The middle tones should have a rich hierarchy and be the subject of a work. Its hue and level directly affect the overall visual effect. The middle tone should be selected PA film. It has a certain degree of latitude and a rich level of expression. When copying the original large works, it is more appropriate to choose the aperture of the lens to be F22, and it is best to control the density of the negative film at 0.5 to 0.8.
(3) The reduction of darkness reflects the overall charm and momentum of a painting, which is a vivid representation. In the process of photographing, the level of dark tone is not prominent, the contrast is too small, and SP film is used to select the film to increase the contrast of the dark tone level. The photographs of the original large works were combined using F22 and F16 apertures, which not only produced a dark tone level, but also made it have a certain contrast. Its density value is controlled at 0.8-1.2.
In the reproduction of the monochrome draft, the use of multiple blocks of spot colors is required for some works with more gradation and richness in order to achieve the same purpose of copying the original works. We often use this method when we copy ancient paintings.
2. Color copying of color originals requires color separations and spot color versions of various colors to be produced by the color separation of the filter to meet the needs of various originals.
(1) The shooting of a color manuscript should be preceded by a distinction between its color and color, in order to determine the different density values ​​of various colors on the film. When taking a picture of the basic color, it is necessary to use a color filter opposite to the picture color for photographing, but it is difficult for the color filter to filter the opposite color, and the reverse color needs to be solved by repair. Take a color manuscript and choose a neutral or hard film. The density value on the color separation sheet depends on the shade of the original color, and it is generally controlled to be 0.2-0.8.
(2) Copying of transmitted originals. Since the size of the reversal sheet is small and the camera is limited by the magnification and contrast, continuous color separation amplification can be adopted.
3. Development and selection of developing solution The correctness of the gradation reduction on the photographic film depends on the developer performance, temperature and developing time. Increase the development humidity, lengthen the development time, increase the contrast of the film, and increase the density value; reduce the development temperature, reduce the development time, and reduce the contrast and density of the film. In the copy photography, the CL-1000 display and fixer were selected, the potion temperature was controlled at 30 degrees Celsius, and the development time was 30-90 seconds. The development time is 30-90 seconds. Developers should not be used for more than one month. Manual development must be replaced with new ones each time.
4. Handling and storage of negative film When a satisfactory film is obtained, whether it can be used for long-term preservation, including how to solve moldy and yellowing problems, should be taken seriously. Molding is caused by the wet storage space. It can be placed in a ventilated and dry place. The yellowing is caused by the short fixing and rinsing time. Potassium cyanide thinning solution can be used for treatment. The formula is as follows:
Water 100ml
Potassium cyanide 1g
Use 1 part of original solution, 4 parts of clear water.
Second, the revised version of the photographic image taken by the film, due to the film itself and the process defects, in the reproduction of black and white manuscripts, the density of some parts on the negative film is not enough, some parts of the density value is high, need to be corrected; color manuscript Color separation of the Yin picture often appears lack of basic color, the opposite color is too much, also need to be amended, the general method of correction is: on the one hand with the red ink method to improve the negative film ... ... Currently, the coating used in the revision is Acid red solution prepared by adding water. For larger density values, thicker, darker acid paints should be used to avoid undesired grayscale or chromaticity during the printing process. Shaiban requires a density of more than 2.0 to achieve the required light blocking rate, so that the non-graphic part of the printing plate is not sensitive. For a negative film with a low density, the acid red coating solution can be lightly coated. If the density requirement is not reached once, it can be done twice or three times until it matches the required density value. If there are excessive repairs during the trimming process, the cotton can be scrubbed with water or soaked in clean water, and the final density of the repaired parts can meet the plate-making requirements. The transmission densitometer can be used for measurement.
The connection of monochrome or color tones is crucial. If the interface coating is more real, the interface will show a clear and unnatural feeling in the printed matter. Therefore, when coating the acidic red coating solution, the interface part should be slowly transitioned to form a natural transition density value and make the reproduced product color tone accurate. natural.
The gray lines in the drawing cannot be solved by the camera method. It is necessary to rely on the scraper to slowly scrape the required density to make it show the natural reduction effect. The thinning method can also be used for local treatment. . (To be continued)
First, the copy of black-and-white monochrome photos is the use of cameras to shoot negatives. There are the following requirements for making negative plates in the reproduction:
(1) Since the light gray tone and the bright tone or the background color contrast in the drawing are small, the photographic film should be selected as a special hard SP film. This kind of film has a large contrast, which helps to open up the contrast between bright and shallow layers. Do not use lens aperture too large. Copy the original large works, F32 aperture is more appropriate, photo film negative film density value of 0.2-0.4 is the best.
(2) The middle tones should have a rich hierarchy and be the subject of a work. Its hue and level directly affect the overall visual effect. The middle tone should be selected PA film. It has a certain degree of latitude and a rich level of expression. When copying the original large works, it is more appropriate to choose the aperture of the lens to be F22, and it is best to control the density of the negative film at 0.5 to 0.8.
(3) The reduction of darkness reflects the overall charm and momentum of a painting, which is a vivid representation. In the process of photographing, the level of dark tone is not prominent, the contrast is too small, and SP film is used to select the film to increase the contrast of the dark tone level. The photographs of the original large works were combined using F22 and F16 apertures, which not only produced a dark tone level, but also made it have a certain contrast. Its density value is controlled at 0.8-1.2.
In the reproduction of the monochrome draft, the use of multiple blocks of spot colors is required for some works with more gradation and richness in order to achieve the same purpose of copying the original works. We often use this method when we copy ancient paintings.
2. Color copying of color originals requires color separations and spot color versions of various colors to be produced by the color separation of the filter to meet the needs of various originals.
(1) The shooting of a color manuscript should be preceded by a distinction between its color and color, in order to determine the different density values ​​of various colors on the film. When taking a picture of the basic color, it is necessary to use a color filter opposite to the picture color for photographing, but it is difficult for the color filter to filter the opposite color, and the reverse color needs to be solved by repair. Take a color manuscript and choose a neutral or hard film. The density value on the color separation sheet depends on the shade of the original color, and it is generally controlled to be 0.2-0.8.
(2) Copying of transmitted originals. Since the size of the reversal sheet is small and the camera is limited by the magnification and contrast, continuous color separation amplification can be adopted.
3. Development and selection of developing solution The correctness of the gradation reduction on the photographic film depends on the developer performance, temperature and developing time. Increase the development humidity, lengthen the development time, increase the contrast of the film, and increase the density value; reduce the development temperature, reduce the development time, and reduce the contrast and density of the film. In the copy photography, the CL-1000 display and fixer were selected, the potion temperature was controlled at 30 degrees Celsius, and the development time was 30-90 seconds. The development time is 30-90 seconds. Developers should not be used for more than one month. Manual development must be replaced with new ones each time.
4. Handling and storage of negative film When a satisfactory film is obtained, whether it can be used for long-term preservation, including how to solve moldy and yellowing problems, should be taken seriously. Molding is caused by the wet storage space. It can be placed in a ventilated and dry place. The yellowing is caused by the short fixing and rinsing time. Potassium cyanide thinning solution can be used for treatment. The formula is as follows:
Water 100ml
Potassium cyanide 1g
Use 1 part of original solution, 4 parts of clear water.
Second, the revised version of the photographic image taken by the film, due to the film itself and the process defects, in the reproduction of black and white manuscripts, the density of some parts on the negative film is not enough, some parts of the density value is high, need to be corrected; color manuscript Color separation of the Yin picture often appears lack of basic color, the opposite color is too much, also need to be amended, the general method of correction is: on the one hand with the red ink method to improve the negative film ... ... Currently, the coating used in the revision is Acid red solution prepared by adding water. For larger density values, thicker, darker acid paints should be used to avoid undesired grayscale or chromaticity during the printing process. Shaiban requires a density of more than 2.0 to achieve the required light blocking rate, so that the non-graphic part of the printing plate is not sensitive. For a negative film with a low density, the acid red coating solution can be lightly coated. If the density requirement is not reached once, it can be done twice or three times until it matches the required density value. If there are excessive repairs during the trimming process, the cotton can be scrubbed with water or soaked in clean water, and the final density of the repaired parts can meet the plate-making requirements. The transmission densitometer can be used for measurement.
The connection of monochrome or color tones is crucial. If the interface coating is more real, the interface will show a clear and unnatural feeling in the printed matter. Therefore, when coating the acidic red coating solution, the interface part should be slowly transitioned to form a natural transition density value and make the reproduced product color tone accurate. natural.
The gray lines in the drawing cannot be solved by the camera method. It is necessary to rely on the scraper to slowly scrape the required density to make it show the natural reduction effect. The thinning method can also be used for local treatment. . (To be continued)
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