1. An imaging photo sensor comprising: a plurality of photo pixel sites arranged in an array comprising a photo sensor and a neutral density filter filtering the photo sensor, each neutral density filter having a density value, the density values being graduated over a range of densities; the sensor being linearly movable, wherein when the sensor is moved across an image, each point in the image is exposed to at least one pixel site having each of the graduated density values and each of the photo pixel sites of the array is exposed to a same light input during a time span of exposure, such that the image is captured at a defined range of exposure values.