Imagesetter VS platesetter
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Imagesetter and platesetter are the two protagonists in the DTP work environment. They are often misrepresented as photo-aligning machines, which is obviously inappropriate, because the full name of the imagesetter is a phototypesetting machine, and its English is phototy, pesetting machine, phototypesetter, photosetter, filmsetter, etc. If the Chinese person mentions the imagesetter, when the translator does not think of imagesetter, it is easy to translate it into photosetter to pass the past, which will cause misunderstanding. In addition, the photo-receiving machine has a clear concept, that is, relying on the word template to make the text is taken on the film or the photographic paper, and then taken to the printing plate. Therefore, the translation of the imagesetter into an image imagesetter is obviously a mistake of reducing its efficient function to the level of the imagesetter.
The etymology of imagesetter is indeed from the typesetter that uses the electronic imagesetter to arrange text. Symmetrical, it is derived from the combination of text, graphics, images and other collections, and becomes a new type of output device, and forms a unique supply and demand market. Some people call it an image output machine, which is not suitable, because the word output machine is a general concept, the output itself does not indicate the process, only the results of the operation, and many similar devices can be called output machines. For example, printer, copier, etc., and the meaning of the setter and the output machine do not correspond, and the reduction is poor.
Structurally and mechanically, imagesetter is completely different from typesetter. It can not only process text, but also process images, photos, etc.; not only the exposure and transmission mechanism has been greatly improved, but also the dot generation technology has been improved accordingly.
Specifically, the typesetter should be translated into a text typesetting machine, which exposes the photosensitive material by a planar transmission method, and has the disadvantage of poor registration accuracy in the process of performing exposure while moving the photosensitive material on one side, and can only be used for black and white characters. deal with. However, imagesetter has evolved to output four-color separation films. The solution is that the inner side of the inner drum is exposed when it is in a stopped state, so that the sleeve is not inaccurate. Later, the imagesetter of the external roller method was introduced. The photosensitive material was rolled on the outside of the roller to receive the exposure, and the high-precision four-color color separation film was output, and the accuracy and stability were improved. Not only does it have a lot of changes in its internal structure, but it can also be seen from its new features and appearance that it is quite different from the imagesetter.
According to the above situation, the understanding of the imagesetter should be: the equipment for obtaining high-precision film imaging using the document data obtained by the page description language. Taking into account its technical connotation, taking care of the correspondence between Chinese and foreign languages, it is considered appropriate to translate imagesetter into "image integration machine". Because the term "integration" has been widely adopted in electronic physics, it has the meaning of bringing together text, graphics, images, photos, and so on. The connotation of the setter device, that is, a collection of images with different tones, can be fully expressed on the high-precision film to generate a complete image, and it is convenient to restore from Chinese to English.
In another protagonist in the DTP work environment, the platesetter is not a synthesizer for plates and photosetter. Translating it into a plateetter is obviously not in line with the facts. Imagine having a printing plate, but also what to do according to the machine? The photo-aligning machine is used for the production of the bottom plate. In principle, it is not directly related to the printing plate. From the Chinese standard, it is not appropriate to use the printing plate to modify the photo-aligning machine. In addition, the platesetter is completely different from the imagesetter in terms of structure or appearance, and its position and position in the DTP working environment are also independent of the imagesetter. In fact, the platesetter is a relative of the imagesetter. In terms of mechanism, it is divided into an internal scanning mode, an external scanning mode, a planar scanning mode, and an inkjet method. The film used in Imagesetter was replaced with a plate on the platesetter.
Material, the plate here is based on paper-based or polyester-based, that is, directly on the paper-based plate or polyester-based plate to form a layout including text, graphics, images, printing resistance is 1 to 20,000 impressions.
The process of imaging on the plate is based on the relationship between infrared light-sensitive or ultraviolet light-sensitive direct imaging. It should be translated into a plate-based imager. The finished product it obtained is a version, so that it can get rid of the concept of backward imagesetter.
Europe and the United States have already advocated the integration of DTP and CEPS technology, and Japan has followed suit. The CEPS mentioned here refers to the color electronic prepress engineering system (ColorElectronic prepressSystem)
Let's briefly introduce the technical integration effect of the two.
CEPS is an electronic plate making system with high image processing capabilities. By incorporating CEPS into the DTP operating environment, image quality can be greatly improved. After the fusion of the two, it is to work effectively. First, in the case of CEPS, a high-quality image is decomposed using a plate-making scanner for revision. Then give the low resolution data to the user, please arrange it for the layout. The designed data is transferred to CEPS to convert low resolution images into high resolution images. Since image processing is a relationship processed on CEPS, it is necessary to re-edit the processing on CEPS when using the splicing data.
In order to carry out the fusion work in accordance with the above, it is necessary to adjust the size of the photo to some extent at the time of color separation. At this time, it should be noted in the operation that once the image is corrected by the application software other than the layout software, the original image cannot be replaced, that is, the low resolution data is used to draw the layout, and the layout software can be enlarged and reduced. Shift, etc.
However, since the change of the image magnification causes deterioration of the image, it is desirable to control it within the range of 80% to 120%. If you need to go beyond this range to zoom in and out, you need to re-separate the color. In addition, in the image conversion, if the file name is not identical to the original data and file name, it cannot be converted, so the file name cannot be changed arbitrarily.
At the time of receipt, the low-resolution image files used must be saved in the same folder as the files. The following diagram may be used to illustrate the technical environment of DTP and CEPS fusion, as well as to clarify the role and position of the imagesetter and platesetter in this environment, so that we can choose a proper title for them.