Patent ID: 8228342

Claim:
An image display device for displaying an image, comprising: an image display unit that displays a graph image based on image data inputted therein, the displayed graph image including: a plurality of graph component elements, each of the plurality of graph component elements including pixels having a gray-scale value that is different than gray-scale values of pixels in other graph component elements of the plurality of graph component elements, and an explanatory region, the explanatory region including a plurality of markers, each of the plurality of markers corresponding to and identifying a separate graph component element of the plurality of graph component elements, each of the plurality of markers having a gray-scale value corresponding to a gray-scale value of the corresponding graph component element; a superimposing unit that superimposes a pointer image on the displayed image, the pointer image being movable over the displayed image; a position receiving unit that receives designation of a position of the pointer image on the displayed image; and a highlighting unit that highlights a first graph component element of the plurality of graph component elements corresponding to a first marker of the plurality of markers, the first marker being located at the designated position of the pointer image.