Patent ID: 8705051

Claim:
An image forming apparatus for generating tile images which correspond respectively to small areas into which a page is divided and forming an image based on the tile images, comprising: a detection unit configured to detect in the page, a range comprising consecutive tile images which have identical image contents based on flags each indicating that an image content of a tile image is identical to an image content of a preceding tile image; a referring unit configured to refer to color information of an end tile image which is generated at an end portion of the consecutive tile images of the range detected by the detection unit and to not refer to color information of other tile images of the consecutive tile images of the range detected by the detection unit; and a first determination unit configured to determine, in a case where the referred to color information, which is referred to by the referring unit, of the end tile image in each range detected by the detection unit indicates white, that the information of the other tile images of the consecutive tile images in each range detected by the detection unit indicate white and determine that the page is blank.