The printing process is inseparable from the illumination source, and the same print will show different colors under different light sources. Therefore, it is necessary to analyze the printing and copying environment and standardize the lighting source used in each part of the printing and copying process to achieve the goal of faithful reproduction. The printing and copying environment referred to in the text includes design room, photo-alignment room, punching dark room, imposition room, printing room, CTP workshop, printing and post-press workshop.
1. Prepress design room
Design is the first process of printing and copying. Usually, the customer sends the manuscript to the design room, where he communicates with the designer, especially the color. In order to communicate well with customers, the designers generally use the pre-prepared chromatograms to ask the customer to identify them on site; after the first draft is completed, the designer will also let the customers watch the screen effects, make comments, modify the site, and sign the seal. In the middle, the customer and the designer should observe the color under the same light source and require the light source of the design room to be close to the natural light. Conditional companies can install standard light sources in the design room or use incandescent mixed fluorescent lamps instead.
2. Phototype room
In general, the photo studio is divided into two parts: the bright room and the dark room. The bright room is used for the hairline operation, and the dark room is used for the film printing.
In the operation of receiving document and computer photo, the color is only distinguishing CMYK four-color film, and it is not necessary to quantitatively evaluate the color. Therefore, it is only necessary to use sufficient light source for the light source of the bright room. Generally, a common fluorescent lamp can be used.
The light source of the darkroom is related to the photographic characteristics of the film used for illuminating. If the film for phototype is a color-blind film that is sensitive to blue-violet light, the light source for a darkroom is a light source that does not contain blue-violet light, which is generally a red light source. You can buy a red light bulb directly or use a red lampshade with an ordinary incandescent bulb cover.
3. Platemaking
The plate-making process is divided into two working environments: the large version and the printing version. The layout environment requirements are basically the same as the lighting room. Since it is only required to distinguish CMYK four-color film, it is not necessary to quantitatively evaluate the color, so the brightness of the light source can be used for basic illumination, and the factory often uses fluorescent tubes.
The printing room should consider the sensitization range and sensitization index of the plate. At present, the most used plate in the printing factory is the positive-type PS plate. The plate film is sensitive to ultraviolet rays; since the natural light contains ultraviolet components, the plate will be exposed (2 minutes to make the plate film sensitive), fluorescent lamp times (30 minutes), the yellow light is the safest (more than 1 hour). Therefore, when choosing a light source in the printing room, the yellow light incandescent lamp should be preferred; fluorescent light can also be used, but the time when the plate is exposed to light should not be too long.
4. CTP workshop
The CTP workshop is generally divided into three parts according to the function: the hair discharge room, the loading and unloading room, and the plate making room.
The hair-distribution room is the place where the layout documents are electronically enlarged and issued. The lighting requirements are the same as those of the general photo-explanatory room, and ordinary fluorescent lamps can be used.
The plate-receiving room is a place for collecting and sorting plates. For photosensitive plates, the surface of the plate is exposed to light for a long time, and there is still the ability to continue to expose. Therefore, the plate-making room should fully consider the plate when selecting the illumination source. Photosensitive wavelength range. Generally, ordinary light sources, such as fluorescent lamps, can be used, but it should be noted that the printed plates should be placed in the shade at a time to avoid long-time illumination. For the thermal CTP plate-making room, the illumination source can be free.
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