A non-transitory computer-readable medium having instructions to control a computer, which is configured to display a webpage including a webpage image based on webpage data, to perform a method of image forming control, the method including: receiving an instruction to select an area on the display screen as a selection area; storing selection area webpage data; storing first image data having a first format generated based on the selection area webpage data; storing image data having the first format representing the webpage image in the selection area, as a second image data; detecting an image absence area, wherein a content of the first image data display is absent from that of the second image data; generating correspondence image data corresponding to the image absence area; compositing the correspondence image data into the image absence area to produce composite image data; and outputting the composite image data.