Valonhankinta
Valonhankinta, literally "light acquisition" in Finnish, refers to the process by which an imaging system or a biological photoreceptor gathers photons from a scene to generate a measurable signal. In photography and digital imaging, valonhankinta encompasses the optical path, sensor characteristics, and exposure settings that determine how much light is collected and how it is converted into an electrical signal.
The main factors that influence valonhankinta are the optics, including aperture size, lens transmittance, and any
In practice, valonhankinta involves balancing brightness, noise, and motion. Underexposure leads to dark images with high
In vision science, valonhankinta also describes the initial transduction of light by photoreceptors, where photons are
Related concepts include exposure, radiometry, imaging sensor, and photodetection.