Disclosed are methods and devices for processing a raster image so that the white color filled in the raster image during building the raster image can be differentiated from that contained in the figure objects presented in the page, which will be inserted into the raster image later. The method comprises building the raster image and filling the raster image with a white color; and transferring the white color in a figure object described in a page and inserting the figure object into the raster image. In this way, the white color filled in the raster image during building the raster image can be differentiated from that contained in the figure objects presented in the page, which will be inserted into the raster image later.