"Dirty" software parameter settings and its actual effect

"Perfection" makes the digitalization of the film into the process simple and successful, which undoubtedly brings confidence to the current CTP towards real practicality. We carried out repeated debugging when scanning large-format scanner ESCOSCAN1724 film "repair dirty", and gained a little practical experience, and that the key to "repair dirty" technology is to adapt to the different conditions of film cleanliness and dot pattern, call different filters And adjust the parameters to bring out the best results. Below we will make an introduction from the different performance and parameter settings of each filter.

(1) Autoclean filter features and its parameter settings. Mainly used for the removal of text visceral spots under a blank background.

The "Radius" parameter determines the size of the removed dirt, the appropriate value is 3-4, the maximum is 6, when the size of the text is significantly larger than the size of the dirty point, the pixel loss in the text will be minimal;

"Threshold": 1% to 100% of the range, preferably set to 50%, when the black pixel value is greater than 50% will produce more black pixels, the effect of the final text thickening, dot Expanding, when it is less than 50%, the opposite is true.

(2) dustfilter filter characteristics and its parameter settings. The main advantage of the removal of text viscera is more than Autoclean's detailed parameter settings. The biggest advantage is that the removal of dirty points also ensures the shape and size of the mesh.

"Radius" parameter value of 1 - 10, usually should be set to a lower value, but greater than the dirty point radius, avoiding the filter effect is too heavy, so that the network is destroyed;

“Interactive Threshold”: When this item is checked, the following high/low thresholds will turn white, and the high thresholds will turn black, but the inter-area network points will remain unchanged;

"Recovery points": This function is used to reconstruct the data that you do not want to delete during the filter processing. This function checks which data is modified by comparing the data using the filter area. Once you find the black pixels around the changed black Pixels, then the black pixels will be expanded to reconstruct, such as the edge of the dot, the outline of the text, and so on. Because the dust filter is operated at the level of the pixel, the filter settings should refer to the scan resolution and number of screen lines, dot size, and the number of pixels per mesh.

(3) Dotclean filter features and its parameter settings. The filter is the core technology of the entire dirtying software. It is mainly used to clear the dirty points in the amplitude modulation net point, and to restore the dot point according to the shape and size of the dot. The parameter settings should be based on the resolution used during scanning. Make adjustments.

"Size" parameter: related to the size of the dirty point, should be slightly larger than the radius of the dirty point, the time required for the filter processing and the "size" is proportional to the relationship, the larger the size, the longer the processing time, the general dirty point 5-10 seconds , big may take 50 seconds;

"Effect": A relative value that controls the degree of effect of the filter.

"Recovery Shape": This is a key parameter setting. When using the built-in Moire filter and the value is 0 when scanning film, Dotclean will rebuild the Moire you removed during scanning. Effect; and when you want to remove a large number of dirty points in the dot area, the value of 0 is very good;

"Restricted Area": ​​When selected, Dotclean will not consider map points outside the constituency when analyzing it;

"High-precision reproduction": When selected, the "repair" software will analyze the 4th pixel with the default settings to obtain a higher accuracy, dedicated to the dot reproduction of the low dot percentage area, such as when only a few dots per dot For a pixel, the filter processing time will be longer.

(4) Rexample filter features and its parameter settings. This filter is used to change the output size of the scanned image, either as a long or wide change, or as a scaling. This technology is less practical, because the density of the large original screens for film scanning should not be arbitrarily changed to prevent the screen from being deformed or distanced from the number of screens of the full-length back-end screen, and also to prevent turtles from being photographed. Pattern or hit the net and other phenomena.

Of course, Perfection Professional Software (Perfection) is still being constantly improved and adjusted. Attention should be paid to its shortcomings during use. For example, Dotclean cannot be used for dirty text or lines, especially when dealing with dots. In areas with text, the text must be circled. Otherwise, the text will be misunderstood as dirty and processed to produce text distortion or text plus white nets. In spite of this, "perfect repair of dirty professional software" due to its outstanding technical expertise, has been combined with the film processing related to the 51-year maturity, the quality of the digital processing of the attached screen film into the full-page output can be reliably guaranteed. The convergence of a technology has filled the gaps in the CTP area and has brought profound effects to the overall development of the CTP.