Graphics 640,480,32,2
SetBuffer BackBuffer()
Image = LoadImage("Test.png")
Dim Buffer(ImageWidth(Image),ImageHeight(Image))
Dim Picture(ImageWidth(Image),ImageHeight(Image))
SetBuffer ImageBuffer(Image)
LockBuffer ImageBuffer(Image)
For X = 0 To ImageWidth(Image)
For Y = 0 To ImageHeight(Image)
Buffer(X,Y) = ReadPixelFast(X,Y)
Next
Next
For X = 0 To ImageWidth(Image) - 3
For Y = 0 To ImageHeight(Image)
BufferR1 = GetR(Buffer(X,Y))
BufferG1 = GetG(Buffer(X,Y))
BufferB1 = GetB(Buffer(X,Y))
BufferR2 = GetR(Buffer(X + 3,Y))
BufferG2 = GetG(Buffer(X + 3,Y))
BufferB2 = GetB(Buffer(X + 3,Y))
TempR = BufferR1 + 0.5 * (BufferR1 - BufferR2)
If TempR > 255 Then TempR = 255
If TempR < 0 Then TempR = 0
TempG = BufferG1 + 0.5 * (BufferG1 - BufferG2)
If TempG > 255 Then TempG = 255
If TempG < 0 Then TempG = 0
TempB = BufferB1 + 0.5 * (BufferB1 - BufferB2)
If TempB > 255 Then TempB = 255
If TempB < 0 Then TempB = 0
Picture(X,Y) = GetRGB(TempR,TempG,TempB)
Next
Next
For X = 0 To ImageWidth(Image) - 3
For Y = 0 To ImageHeight(Image)
WritePixelFast X,Y,Picture(X,Y)
Next
Next
For X = ImageWidth(Image) - 3 To ImageWidth(Image)
For Y = ImageHeight(Image) To ImageHeight(Image)
WritePixelFast X,Y,Buffer(X,Y)
Next
Next
UnlockBuffer ImageBuffer(Image)
Dim Buffer(0,0)
Dim Picture(0,0)
SetBuffer BackBuffer()
DrawImage Image,0,0 : Flip
WaitKey : FreeImage Image : End
Function GetR(RGB)
Return (RGB And $FF0000) / $10000
End Function
Function GetG(RGB)
Return (RGB And $FF00) / $100
End Function
Function GetB(RGB)
Return RGB And $FF
End Function
Function GetRGB(R,G,B)
Return R * $10000 + G * $100 + B
End Function
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