Well the "pen" will be attached to a cradle which will be attached to a belt/string witch in turn is attached to a 2 pulley, now if the cradel is suspended in front of the canvas which is standing vertically, by changing the length of the 2 belts/strings the cradle holding th pen will be able to be transported to almost anywhere below the pulleys. right? if i know how big the image is in pixels and the pass an array of binary 1 or 0 will that make the image smaller in size? since i only need black or white?