Image processing apparatus and image forming apparatus and image processing method and image forming method
AssigneesKabushiki Kaisha Toshiba, Toshiba Tec Kabushiki Kaisha
InventorsShunichi Megawa, Sunao Tabata
Life of this patent
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Abstract
A trapping means judges that the gradated region is dark if compared with the uniform region and expands the uniform region to cause colors to overlap when the density average value Da of the gradated region is greater than the density value Du of the uniform region but judges that the gradated region is light if compared with the uniform region and expands the gradated region when the density average value Da of the gradated region is smaller than the density value Du of the uniform region.
Claims17
An image forming apparatus, comprising:
- image developing means for generating first image data for a plurality of color form plates and identification data representing attributes of their pixels;
- trapping means for performing a trapping processing operation with reference to the first image data and the identification data supplied from the image developing means and outputting second image data;
- image processing means for performing an image processing operation based on the second image data output from the trapping means and the identification data supplied from the image developing means;
- and
- image outputting means for outputting image data processed by the image processing means.
An image processing apparatus for receiving as input first image data for a plurality of color form plates and identification data representing attributes of their pixels as generated by image developing means and performs an image processing operation, the apparatus comprising:
- a density value computing section which computes density values of a gradated region with reference to a predetermined region of the first image data and its identification data supplied from the image developing means;
- an extracting section which extracts a density of a uniform region with reference to the predetermined region of the first image data and its identification data supplied from the image developing means;
- an image synthesizing section which outputs second image data based on the density values computed by the density value computing section, the density of the uniform region extracted by the extracting section and the first image data and its identification data supplied from the image developing means;
- and
- an image processing section which performs an image processing operation based on the second image data output from the image synthesizing section and the identification data supplied from the image developing means, wherein
- the density value computing section computes a density average value of the gradated region with reference to the predetermined region of the first image data and that of its identification data supplied from the image developing means;
- and
- the image synthesizing section outputs second image data based on the density average value of the gradated region computed by the density value computing section, the density of the uniform region extracted by the extracting section and the first image data and its identification data supplied from the image developing means.
An image processing method of receiving as input first image data for a plurality of color form plates generated by image developing means and identification data representing attributes of their pixels, the method comprising:
- computing density values of a gradated region with reference to a predetermined region of the first image data and its identification data supplied from the image developing means;
- extracting a density of a uniform region with reference to the predetermined region of the first image data and its identification data supplied from the image developing means;
- outputting second image data based on the computed density values, the extracted density of the uniform region and the first image data and its identification data supplied from the image developing means;
- and
- performing an image processing operation based on the output second image data and the identification data supplied from the image developing means.
Dependencies are inferred from the claim text.