   don't laugh at me.what is gamma?
  see subjetct. 
  Gamma is a greek letter. Gamma is used to denote constants or variables in many different contexts. Even within a limited scope such as game programming, gamma can be used to denote a large number of things. If I had to guess what you''re talking about I''d assume you''re asking about "gamma correction". Which is adjusting input signals to account for different intensity to voltage response curves in monitors. ;  In simplest terms, gamma is the ratio of the numerical value of a pixel to its actual screen brightness. A higher gamma means a brighter pixel.   John BoltonPage 44 StudiosCurrent project: NHL Faceoff 2005 PS2 ;  at sea. ;  In simplistic terms, if you change your monitor''s brightness setting, you can make your screen very dark or extremely light.  This is the basic idea behind gama -- higher gama yeilds lighter scenes, while lower gama yeilds darker scenes. ;  Yeah, I would like to know this too. If I''m developing a game and I want to include ''Gamma correction'' in it''s options, how do I have to modify every pixel that''s going to the screen? What mathematical formula is used here? ;  I believe in most graphics APIs there is a specific option to set the general screen gamma. Eg. Direct Draw had some object for it I remember, and the newer Direct 3D could have either some special function for it or as some render state. OpenGL I''d assume to have some function for this purpose as well. ;  dose higher gamma means higher RGB? ;  no, it just means the screen physically puts out more light for the same RGB color. ;  OK, I did a little searching and found this formula for anyone interested:newcolorvalue = oldcolorvalue ^ gammawhere color values are from [0, 1]. For colors from [0, 255] this becomes:newcolorvalue = 255 * ((oldcolorvalue / 255) ^ gamma)For gamma = 1 the color stays unchanged, for gamma > 1 it is brighter and for gamma < 1 it is darker. 