Image reading device, image forming apparatus, method for controlling image reading, and non-transitory computer-readable medium

A method for controlling image reading performed by an image reading device, the image reading device comprising:

• an image reading unit configured to, in a process of reciprocating relative to a fixed document, read a document image using one or a plurality of reading colors, and when a plurality of reading colors are used, read the document image while successively switching the reading colors in a process of moving;
• and a moving unit configured to move the image reading unit, the method comprising:
• changing moving speeds of the image reading unit in an outgoing path and a return path based on a number “N” (where N is a positive integer) of the reading colors by the image reading unit;
• and
• changing reading color numbers of the image reading unit in the outgoing path and the return path based on the number “N” of the reading colors.

A non-transitory computer-readable medium comprising computer readable program codes, performed by an image reading device, the image reading device comprising:

• an image reading unit configured to, in a process of reciprocating relative to a fixed document, read a document image using one or a plurality of reading colors, and when a plurality of reading colors are used, read the document image while successively switching the reading colors in a process of moving;
• and a moving unit configured to move the image reading unit, the program codes when executed causing the image reading device to execute:
• changing moving speeds of the image reading unit in an outgoing path and a return path based on a number “N” (where N is a positive integer) of the reading colors by the image reading unit;
• and
• changing reading color numbers of the image reading unit in the outgoing path and the return path based on the number “N” of the reading colors.