Abstract: In a data processing method, all information on a figure to be drawn, as vector-graphic data representing said figure, is transmitted to a drawing apparatus. The vector-graphic data is processed to form an image, as raster-graphic data representing the figure, and the run length data is extracted from the image. The run length data is grouped to become grouped run length data, and outline vector-graphic data, that is having a smaller data amount than that of the vector-graphic data, and that is based on an outline of the figure represented by the grouped run length data, is created. In another data processing method, the drawing data is processed in a workstation such as a CAD system, and the resulting outline vector graphic data is transmitted to the drawing apparatus.

Abstract: In a data processing method, all information on a figure to be drawn, as vector-graphic data representing said figure, is transmitted to a drawing apparatus. The vector-graphic data is processed to form an image, as raster-graphic data representing the figure, and the run length data is extracted from the image. The run length data is grouped to become grouped run length data, and outline vector-graphic data, that is having a smaller data amount than that of the vector-graphic data, and that is based on an outline of the figure represented by the grouped run length data, is created. In another data processing method, the drawing data is processed in a workstation such as a CAD system, and the resulting outline vector graphic data is transmitted to the drawing apparatus.

Abstract: Disclosed is a multi-beam image forming system, which has a light emitting unit including a plurality of light sources emitting a plurality of beams, and a table carrying a photosensitive film on which an image is formed with the plurality of beams. A sensor is provided on the table, and light amount of each of the light sources is detected by moving the table and the light source relative to each other. Further, based on the detected light amount of each of the light sources, compensation values are determined. The compensation values are used when the light sources are driven so that the light amount on the photosensitive film accurately corresponds to an image data.