1. An image processing apparatus comprising: an image area designating device for designating an area to be extracted of an original image displayed on a display screen; color changing means for changing the color of an area, excluding the area to be extracted which has been designated by said image area designating device, of the displayed original image into a particular color; and storage controlling means for storing pixel data representing pixels having colors excluding the particular color obtained by the change in said color changing means in the displayed original image and coordinate data representing positions of the pixels in the displayed original image with the pixel data and the coordinate data correlated with each other.