| 摘要 |
A color copying apparatus is capable of making copies without performing a prescan. Input image data of RGB format read from an image input unit is written in an image memory through the shading/gap correction unit and an input gamma correction unit. This input image data is supplied to a detection unit through a first color space conversion unit to distinguish color from monochrome in the input image data, and to detect the base color level and the like. Next, on the basis of these detection results, states of a second color space conversion unit, a selector, a frame-erase/base color removal unit and the like are set. Thus, the input image data is read out again from the image memory, and is supplied to an image output unit through the first color space conversion unit to an output gamma correction unit.
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