Image reading apparatus and image reading method

An image reading method in an image reading apparatus including a plurality of light sources in the same direction as a main scanning direction of an original to read the original, comprising the steps of:

• designating a reading mode through a display operation unit;
• detecting an original size;
• determining the detected original size and identifying an original existing region on the basis of the original size before reading of the original;
• determining an original width and original length to be read, on the basis of the identified original existing region;
• determining a lighting width and an exposure width of the light sources in accordance with the original width and 10 the original length;
• and
• reading an image in accordance with the determined lighting width and exposure width.

An image reading method in an image reading apparatus including a plurality of light sources in the same direction as a main scanning direction of an original, comprising the steps of;

• reading the original by irradiation of the light sources;
• outputting reading information corresponding to the original read by the reading step;
• identifying an original existing region where the original exists;
• and
• controlling the light sources corresponding to the original existing region identified by the identifying step.