An image processing apparatus that performs rendering processing for forming an image by a scan line method, including: a span processing unit configured to generate span data corresponding to a span demarcated by a contour of an object existing on a scan line; an elimination unit configured to perform elimination processing of an object unnecessary for drawing in the span for the generated span data; and a generation unit configured to generate a bitmap image in units of pages by using pixel data necessary for drawing of each span based on the span data after the elimination processing, wherein the generation unit generates, in a case where a part of a specific image object within a page is eliminated by the elimination processing, the pixel data necessary for drawing of each span is generated by acquiring the pixel data corresponding to the part from a FIFO memory and then discarding the acquired pixel data corresponding to the part in accordance with instructions to read and discard the part included in the span data after the elimination processing.