Abstract: A radiation image photographing system includes: a radiation generator installed on a round visit cart or a transportable radiation generator; and an FPD cassette including a plurality of radiation detecting elements arrayed two-dimensionally, wherein the radiation image photographing system performs videography by photographing a sequence of multiple radiation images using the FPD cassette, and the radiation image photographing system further includes: a calculation device configured to calculate remaining time before the photography of the sequence of multiple radiation images is finished; and a display device configured to display the calculated remaining time.

Abstract: A radiation generator capable of projecting radiation includes a light projection apparatus configured to project visible light that indicates, during projection of radiation from the radiation generator, a range including and broader than an irradiation field of radiation projected from the radiation generator.

Abstract: A radiation image photographing system includes: a radiation generator installed on a round visit cart or a transportable radiation generator; and an FPD cassette including a plurality of radiation detecting elements arrayed two-dimensionally, wherein the radiation image photographing system performs videography by photographing a sequence of multiple radiation images using the FPD cassette, and the radiation image photographing system further includes: a calculation device configured to calculate remaining time before the photography of the sequence of multiple radiation images is finished; and a display device configured to display the calculated remaining time.

Abstract: An area coverage modulation image B is formed by an image forming method by the use of an area coverage modulation image A being a group of pixels which have binary data indicating a recording pixel or a non-recording pixel. The method includes (1) a step of obtaining an area coverage ratio of recording pixels in a frame in a predetermined size arranged around each of target pixels of the area coverage modulation image A, wherein a quantity of the recording pixels in the frame is counted to obtain the area coverage ratio to an entire area of the frame, and (2) a step of changing at least either binary data or a color tone of each target pixel, according to the area coverage ratio, wherein the method performs the steps on the target pixels of the area coverage modulation image A to form the area coverage modulation image B.

Abstract: An image forming method includes a first process for outputting a first image from a first output device, using a group of 1 bit data of respective dots of an area coverage modulation image, and a second process for outputting another image from another output device with an output method different from an output method for the first output device, using the group, wherein the second process includes a halftone-dot percentage adjusting step of adjusting a halftone-dot percentage of a halftone-dot included in the area coverage modulation image, and a color adjusting step of adjusting a color of each dot of the halftone-dot, the other image being approximated to the first image.

Abstract: A proof formed with a halftone-dot gradation image having a halftone dot, the halftone dot including a set of pixels, and the proof has pixels disposed along a periphery of the halftone dot boundary, wherein the pixels disposed have a lower density than that of the set of pixels included in the halftone dot.

Abstract: Disclosed are optical beam scanning apparatus and method of the internal drum scanning system, in which optical beams from a light source are made incident on optical beam rotating means such as a trapezoidal prism, and outgoing beams are focussed on the inner face of a cylinder through rotary optical means such as a rotary reflecting element. In the scanning apparatus and method of the present invention, by rotating the trapezoidal prism on the same revolution axis as that of the rotary reflecting element at a revolution speed corresponding to 1/2 of the revolution speed of the rotary reflecting element, beams going out from the trapezoidal prism can be rotated at the same speed as the revolution speed of the rotary reflecting element. According to the present invention having the above structure, even when a plurality of beams are used, crossing of the beams on the inner face of the cylinder can be prevented, and multiple beam scanning becomes possible and recording can be performed at a high speed.