p8lect3 - DigitalPhotographyI(PGY1800C Page1...

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Digital Photography I   (PGY1800C)   Page 1            Light is the photographer's basic raw material.   Light is the  visible portion of the electromagnetic spectrum.   Beyond this  visible spectrum are wavelengths not seen by the human eye but are  recordable on specialized films and sensors, such as infrared, ultra-  violet, and x-ray.  At the far ends of the electromagnetic spectrum are  radio waves with frequencies measured in miles and high energy  waves like gamma measured in millionths of a millimeter,  nanometers.  Visible light is a very small portion of the total spectrum. Electromagnetic Spectrum UV      IR I--------------------------------//----------------I x-ray                     Visible (Light)     microwave             gamma                                                 radio        (.00000000004 in.)                                     (6 miles) Visible (Light) Blue             Green               Red
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I--------------|-----------------|-----------------I 400           500               600               700nm (nanometer =  millionth/mm) Page 2 The visible spectrum can be broken down into three broad  bands of color;  red green, and blue,  the  additive   primaries  of light.  Seen together, in roughly equal amounts, we refer to it as  "white  light" .   Each pair of additive primaries blended together creates  secondary  colors referred to as  subtractive primaries .  Blending  these subtractive colors together creates black. Additive primaries
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p8lect3 - DigitalPhotographyI(PGY1800C Page1...

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