From the course: Photography Foundations: Black and White
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How a camera's image sensor captures an image - Photoshop Tutorial
From the course: Photography Foundations: Black and White
How a camera's image sensor captures an image
In the back of your camera, directly behind the lens, is a small computer chip that has an area of light- sensitive material on it. This is the camera's image sensor, and it's what actually captures light and makes an image. It's the digital equivalent of a piece of film, or the back of your eyeball. The surface of the image sensor is divided into a grid, with one cell for each pixel that the sensor can capture. So if you have a 10-megapixel camera, the sensor is divided into a grid of 10 million cells. Each one of these cells contains a type of metal in it that emits electrons when struck by light. The more light that strikes an area, the more electrons that get emitted. By reading the voltage at each one of these cells, and these cells are called photosites, by reading the voltage, we can find out exactly how much light has struck each pixel. In other words, we can capture an image. Now here is the kicker. There is no color in this image. All that the sensor detects is how much…
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