Patent ID: 8432586

Claim:
An image reading apparatus which includes a multi color line sensor and a monochrome line sensor, a parameter for reading by the multi color line sensor being different from a parameter for reading by the monochrome line sensor, said image reading apparatus comprising: a prediction unit configured to predict, prior to an input of an original reading start instruction, whether to read an original image in a monochrome reading mode in which the image reading apparatus reads the original image in use of the monochrome line sensor or a multi color reading mode in which the image reading apparatus reads the original image in use of the multi color line sensor; a setting unit configured to set, prior to the input of the original reading start instruction, the parameter for reading the original by the multi color line sensor without waiting for the input of the original reading start instruction in a case where said prediction unit predicts the multi color reading mode, and to set the parameter for reading the original by the monochrome line sensor without waiting for the input of the original reading start instruction in a case where said prediction unit predicts the monochrome reading mode; a determination unit configured to determine whether a reading mode predicted by the prediction unit matches a reading mode designated for reading the original in response to the input of the original reading start instruction; and a change unit configured to change the parameter set by the setting unit to the parameter corresponding to the reading mode designated for reading the original if the reading mode predicted by the prediction unit does not match the reading mode designated for reading the original.