ReadPixelFast pb

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Walter

WritePixelFast seems to work but if I use ReadPixelFast instead of ReadPixel my sprite is purple block! Why?

Graphics(800,600,0,2)
SetBuffer BackBuffer()

img=LoadImage("sprite200x180.jpg")
img_buf=ImageBuffer(img)


While Not KeyHit(1)
	x=MouseX()
	y=MouseY()
	Cls
	LockBuffer()
	For j=0 To 179
		For i=0 To 199
			c=ReadPixel(i,j,img_buf)
			WritePixelFast(x+i,y+j,c)	
		Next
	Next
	UnlockBuffer()
	Flip()
Wend

FreeImage(img)