Digital Image Processing,3rd ed. Gonzalez Woods www.ImageProcessingPlace.com Chapter 6 Color Image Processing Basic quantities to describe the quality of light source: Radiance:Total amount of energy that flows from the light source (in W). Luminance:A measure of the amount ofenergy an observer perceives from the light source (in Im) Brightness:A subjective descriptor that embodies the achromatic notion of intensity and is practical impossible to measure. 1992-2008 R.C.Gonzalez R.E.WoodsDigital Image Processing, 3rd ed. www.ImageProcessingPlace.com © 1992–2008 R. C. Gonzalez & R. E. Woods Gonzalez & Woods Chapter 6 Color Image Processing  Basic quantities to describe the quality of light source:  Radiance: Total amount of energy that flows from the light source (in W).  Luminance: A measure of the amount of energy an observer perceives from the light source (in lm)  Brightness: A subjective descriptor that embodies the achromatic notion of intensity and is practical impossible to measure