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GetPixel()
Return the colour of a pixel
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Syntax
GetPixel( <hDC>, <nX>, <nY> )   -->   nColour

Arguments
<hDC> specifies the device context for a window.

<nX>, <nY> specify the position of the pixel.

Returns
If successful, the return value is a colour value
(corresponding to colours produced by the RGB() macro).  If
an error is detected (such as an invalid <nX> or <nY>), -1 is
returned.

Description
This function retrieves the actual colour used for a single
pixel in a window.

Example
? "Red component", GetRValue( GetPixel( hDC, 100, 100 ) )