In example implementations, an apparatus is provided. The apparatus includes a light table, a camera, and a processor communicatively coupled to the light table and the camera. The light table is to emit light through an object on the light table. The camera is to capture an image of the light table. The processor is to receive an image of the light table without the object, receive an image of the light table with the object, and calculate a transmission value for each pixel of the object in the image of the light table with the object, wherein a mechanical property of the object is to be determined based on the transmission value of the object.