I’ve never been able to grasp how it is possible to take photos or videos. I know in school we were taught about it but it never clicked.
In: Technology
Very simply traditional chemical photography is based on focusing light onto a film covered in tiny light sensitive crystal granules, when exposed to light the optical properties of the granules change. Early film formulations had a long exposure time meaning it took more time for the chemical reactions in the film to take place therefore people had to remain very still when being photographed or the image would be blurry.
Over time formulations with shorter exposure times were developed eventually allowing for motion pictures in which 24 images could be taken per second on a strip of film, colour photography worked by incorporating 3 layers of film sensitive to light at red, green & blue wavelengths.
Digital photography again very simply works by focusing an image onto a sensor with a matrix of light senstive components that are logged and reset multiple times a second in the case of digital video with the sensor data then being stored and processed electronically. Colour digital photography uses an RGB filter to focus light of different wavelenghts on different areas of the sensor grid which can then be combined with processing to create a colour image, higher-end cameras may use 3 separate photosensors for red, green & blue with light directed at each with a prism.
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