Facsimile and static presentation processing – Natural color facsimile
Patent
1990-10-02
1994-12-27
Coles, Sr., Edward L.
Facsimile and static presentation processing
Natural color facsimile
358448, 358451, 3582611, 358524, H04N 146, H04N 1393, H04N 1419
Patent
active
053770234
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a pictorial image processing system utilizing a computer, and more particularly to a technology for processing pictorial image data on a memory and handling the processed data. Especially, this invention is concerned with a pictorial image processing system suitable for processing pictorial image in a screen tint portion of a printed matter.
BACKGROUND ART
Large of portions having a fixed color tone, so called screen tint portions, exist in color printed matters. The pre-press process of such screen tint portions are carried out by a special process different from the pre-press process of general color portions. Colors represented by a mixture of four colors of yellow (Y), magenta (M), cyan (C) and black (K) are given to respective screen tint portions. Such mixed colors are determined by numeric values expressed by dot percent rates (hereinafter called dot percent) in color separation used for respective colors at the time of printing. In the prior art, several kinds of masks for extracting the same dot percent regions and transparent films (screen tints) in which dots are provided at a desired dot percent rate are prepared to repeatedly expose light onto an exposure film to thereby carry out work for preparing a screen tint film.
In recent years, there have proposed technologies for preparing such a screen tint film by making use of a computer. For example, apparatus for preparing a screen tint film using a computer are disclosed in the specification of the Japanese Patent Application No. 213259/85, the specification of the Japanese Patent Application No. 270501/85, and the specification of the Japanese Patent Application No. 231365/87. In these apparatus, a contour line pictorial image described or depicted on a block copy is read by a scanner, etc. to carry out coloring process by a computer on the basis of the pictorial image data thus read to directly prepare screen tint films for respective colors.
The above-described apparatus for preparing a screen tint film using a computer typically include a disk unit as an external storage unit to retain pictorial image data in the disk unit. In the case of carrying out a pictorial image processing, such as coloring, pictorial image data in the disk unit is read out into the main memory in the computer to implement a pictorial image processing, such as coloring, to the pictorial image data in the main memory. During implementation of such pictorial image processing, it is necessary to display a pictorial image subject to processing on a visual display. For affecting such display, a frame memory is provided to transfer pictorial image data required for display from the main memory to the frame memory to thereby display a necessary pictorial image.
Ordinarily, the pictorial image data include raster data comprising color values of respective pixels arranged in order of arrangement of the pixels, and runlength data indicating arrangement of pixels having the same color value. In the conventional apparatus, the main memory and the frame memory store pictorial image data in the form of raster data, and the disk unit stores pictorial image data in the form of runlength data. This is because since the frame memory is directly connected to the visual display, it is necessary to retain data in the form of raster data, whereas it is convenient to retain data in the disk unit for storing several pictorial images in the form of runlength data permitting the whole capacity of data to be less. In the main memory for transferring data to the frame memory, an approach is used to retain data in the form of raster data in the same manner as in the case of the frame memory. Accordingly, in the conventional apparatus, pictorial image data in the form of runlength data in the disk unit is converted to raster data and is then read out onto the main memory. The raster data on the main memory is transferred to the frame memory in the form of raster data as it is, thus displaying pictorial images.
However, such apparatus have the problem t
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Sano Shigehiro
Tsunashima Kazuya
Yanase Akio
Coles Sr. Edward L.
Dai Nippon Insatsu Kabushiki Kaisha
Lee Thomas D.
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