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red,green,blue - specifies the source red,green,blue components.
dest_red#,dest_green#,dest_blue - specifies the destination red,green,blue components. |
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SetGamma allows you to modify the gamma tables.
Gamma can ONLY be used in fullscreen mode. After performing one or more SetGamma commands, you must call UpdateGamma in order for the changes to become effective. Note that the behaviour of this command in Blitz3D is different to BlitzPlus. Blitz3D will clamp out of range values, so that 300 is treated as 255. BlitzPlus allows values to "roll-over", so that 300 is treated as 44. See also: UpdateGamma. |
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;gamma demo - use left/right arrows to
;control display intensity ; ;hold down left-control for a 'red-out' effect! Graphics 640,480,16,1 SetBuffer BackBuffer() n=0 While Not KeyHit(1) If KeyDown(203) And n>0 Then n=n-1 If KeyDown(205) And n<255 Then n=n+1 If KeyDown(29) SetGammaRed(n) Else SetGammaIntensity(n) EndIf Cls SeedRnd 1234 For k=1 To 1000 Color Rnd(255),Rnd(255),Rnd(255) Rect Rnd(640),Rnd(480),Rnd(64),Rnd(64) Next Text 0,0,"Intensity offset="+n Flip Wend End ; bye! Function SetGammaRed( n ) For k=0 To 255 SetGamma k,k,k,k+n,0,0 Next UpdateGamma End Function Function SetGammaIntensity( n ) For k=0 To 255 SetGamma k,k,k,k+n,k+n,k+n Next UpdateGamma End Function |