1. An information processing device comprising: an identifying unit configured to identify a first object expressed by pixel data and a second object expressed by vector data from target image data including drawing information for each object; a generation unit configured to perform rasterization based on first drawing information indicating the drawing information of the first object and second drawing information indicating the drawing information of the second object to generate combined image data, into which the first object and the second object are combined; and a contour extraction unit configured to extract a contour from the combined image data.