Abstract: A digital impositioning apparatus performs impositioning using file output of electronic data instead of film output. An impositioning portion 12 creates imposition data for each page based on arrangement information. Here, in order to conform to the type of a printer 31, the impositioning portion 12 rewrites as required the arrangement information by an instruction from a terminal 21 to create suitable imposition data. A joining portion 13 positions the above imposition data so as to be optimally arranged on a printing plate. This positioning can be performed as being checked on a screen of the terminal 21. The print information adding portion 14 reads from outside and arranges accessories required for printing. A dot generating portion 17 converts a rasterized file after the above data processing from raster style data for each page to dot data organizing a plurality of pages, in consideration of dot gain adjustment from a control peroration 15.

Abstract: A method for manufacturing electric masks characterized by a step of setting a cutout area of the original picture adhered to an input drum by using a color scanner comprising CRT monitor and coordinate input device, a step of roughly scanning the picture in this cutout area at coarser pitch than the scanning pitch in duplicating and recording process, a step of averaging the picture signal obtained by this rough scanning into coarse sampling data, a step of writing this coarse sampling data into the background memory of CRT monitor, a step of displaying thus written coarse sampling data on the CRT monitor as a picture, a step of writing the contour of desired electric mask on the display image by using the coordinate input device while observing this display image and displaying on the control memory, a step of making an electric mask by painting out the contour and writing the electric mask data obtained at this time into the control memory, and a step of reading out the electric mask data written in the co

Abstract: A light ray emitted by a light source and which is to be modulated by an acoustic-optical modulator element is stabilized by its intensity being detected before it enters the acoustic-optical modulator element and being used to produce correction signals. The correction signals are used to amplitude-modulate a high-frequency carrier in reverse phase to the change of intensity of the light ray, to produce corrected carrier signals. Then the corrected carrier signals are further amplitude-modulated by control signals to produce modulator signals which are used to modulate the light ray in the acoustic-optical modulator element.