As we’ve talked in the previous topics about sensors and pixels, each photo is composed of a number of pixels. Each of these pixels have a certain level of brightness, ranging from 0 (black) to 255 (white). A histogram is a graphical representation of these levels of brightness for the entire photo.
Posts Tagged ‘pixels’
All the pixels in a photo have certain level of brightness ranging from black to white. These values of the pixels serve as the input for the computer monitor. Due to technical limitations, CRT monitors output these values in a nonlinear way: Output = Input ^ Gamma
The dynamic range of any sensor used in digital cameras is defined by the largest possible signal divided by the smallest possible signal it can generate. The largest signal represents the maximum amount of light that can be converted by the sensor into a unique digital value that represents a pixel into a photo. The [...]
In digital computers world bits are the smallest pieces of information that can be stored. One bit of information has a value of either “0″ or “1″. This values correspond with the two states of a switch: “on” and “off”. The electronic switches used in computers are called transistors.
Sensors are linear devices. If you double the amount of light, the sensor output will double, as long as the pixels are not full. If a pixel reaches full capacity, the output will be constant or clipped. Human vision is non-linear. If we double the light, the effect will be larger in low light conditions [...]