Abstract: An image reading apparatus comprises: a first reading unit for reading a first surface image of a document; a second reading unit for reading a second surface image of the document; and a color conversion processing unit for generating a table used for correcting an error of a read color of an image read by the first reading unit and an image read by the second reading unit, and performing a color conversion to the image read by said first reading unit and/or the image read by said second reading unit using the table.

Abstract: Disclosed is an image reading apparatus which reads images in a front side and a back side of a document by passing the document through the image reading apparatus once including a first reading section to read the front side of the document, a second reading section to read the back side of the document and an image process section to calculate a first standard value for carrying out a first shading correction to the first reading section and a second standard value for carrying out a second shading correction to the second reading section, respectively, and to carry out the first shading correction to a first image data read by the first reading section based on the calculated first standard value and to carry out the second shading correction to a second image data read by the second reading section based on the calculated second standard value.