How Digital Cameras Work
The lens forms the image
The image is flashed on a sensor
In a film cameras the image is flashed on film. The
picture area of 35mm film is about 24mm by 36mm in size.
A sensor in a digital camera is often smaller than the
picture area of a 35mm camera, sometimes much smaller. The
lenses for digital cameras have correspondingly shorter focal
lengths.
The sensor captures the image as a
raw digital file. A variety
of technologies are used to determine the color value for
each pixel.
Depending on the camera settings, the image is converted
to a specific size in pixels, compressed and then written
to memory.
Eventually, you transfer your images to a computer or
printer.
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