Image reading unit, image processing apparatus, image forming apparatus, image processing method, and computer product

摘要

An image reading unit includes a document determining unit that generates both multi-value data of color components of RGB and binary data indicating black or white as a black component by scanning a document once with one reading unit for an image of a document, stores the multi-value data and the binary data in a storing unit, and determines whether the document is a monochrome document or a color document; and a data processing unit that, when the document determining unit determines that the document is a monochrome document, selects the binary data stored to process the binary data as valid data, and when the document determining unit determines that the document is a color document, selects the multi-value data stored to process the multi-value data as the valid data.