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Photons, Electrons and Gray Levels

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Photons, Electrons and Gray Levels

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The digital image created by a scientific camera shows the level of light that falls on every pixel as an intensity value, this value is known as a gray level. With no light, the pixel is almost completely black, and when saturated the pixel is white. Everything in between is therefore a level of gray, hence a ‘gray level’. The bit-depth of the scientific camera is a representation of the maximum number of gray levels that the camera is capable of displaying. For example, an 8-bit camera is capable of displaying 256 gray levels, a 12-bit camera 4096 gray levels, and a 16-bit camera 65,535 gray levels.

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