The Science of Photography

August 29, 2008

Ever wondered how does digital photography work? Here’s a quick ‘science/physics’ on the mechanisms of digital photography to help you better understand and APPRECIATE the wonders of technology. Oh no, don’t you groan now, it’s not gonna be boring! :)

Okay, in principal, digital photography works very much the same way as traditional film photography.

Light passes through the lens onto a light-sensitive material called digital photo-sensor (DPS) this is also the equivalent of the traditional film.

The sensor is an array of millions of light-sensitive cells of photodiodes which respond to the light falling on it when the camera opens its shutter.

A corresponding signal is then created in which it is ‘digitized’ (aka given a number value) so that the computer, in your camera, can read it.

In essence, the sensor in your camera acts like it is painting your photograph by numbers.

Imagine taking a piece of white paper divided into a grid of several million squares. Each square has a number and if no light reached that particular square, the number would be zero and the square would be black. Once the computer reads every square, you will have an accurate black and white picture of the original scene you have taken with your camera!

And that’s! Thats basically how digital photography works in a nutshell. Don’t wanna bore you too much with the details but stay tuned for more quick lessons on photography.

We learn something new everyday huh :) Ciao!

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