A single photodetector behind the disk captured the image brightness at any given spot, which was converted into a radio signal and broadcast.
Tone reproduction is the relationship between scene luminance and the reproduced image brightness.
The main idea is to smooth image brightness between series of the same scene frames.
The purpose of detecting sharp changes in image brightness is to capture important events and changes in properties of the world.
It can be shown that under rather general assumptions for an image formation model, discontinuities in image brightness are likely to correspond to:
There is also a difference in image brightness.
Individual pairs of binoculars vary widely in terms of construction materials, smoothness of focus, image brightness, and overall size and weight.
The previously unexplained changes in image brightness and consistency are now blamed on poor processing (variable development times, insufficient agitation in the developing bath and insufficient fixing).
Drivers can select the level of image brightness to accommodate their eyes' adaptation to darkness (think of what happens when you turn on a light inside the car).
This eliminates vane diffraction and blockage, as well as secondary mirror scattering and absorption, thus improving image brightness and contrast.