# Image Representation - image is composed of discrete pixels - **image size**:: *total number of pixel in vertical line* x *total number of pixels in horizental line* ```ad-attension it does not specify the size of the image ```ad-ex A 640 x 480 image would measure 6 inches by 5 inches when presented (e.g., displayed or printed) at 96 pixels per inch. On the other hand, it would measure 1.6 inches by 1.2 inches at 400 pixels per inch. ```