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The subjective, psychological attribute of vision according to which an area appears to emit more or less light. It is a perceptual quality and is not directly proportional to the physical measure of light intensity.
read more about stimulus brightness ...The physical measure of light intensity related to brightness is Luminance, which is the photometric measure of light emitted or reflected from a surface in a given direction.
Brightness perception is generally non-linear. According to the Weber-Fechner Law, the perceived increase in brightness is proportional to the logarithm of the physical light increase.
Brightness is heavily influenced by surrounding objects. An object of a specific luminance will appear brighter if surrounded by a darker area and dimmer if surrounded by a brighter area (Simultaneous Contrast).
No. Brightness refers to the perceived light level (light-dark dimension), while saturation refers to the purity or richness of a color.
The minimum brightness detectable is the absolute threshold of light detection, typically measured in scotopic (dark adapted) conditions.
The pupil size controls the amount of light entering the eye. A large pupil allows more light in, increasing the subjective brightness of a scene.