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void main()
{
float4 c0 = Sample();
float4 tmp = float4(0.0, 0.0, 0.0, 0.0);
tmp += c0 - SampleOffset(int2( 2, 2));
tmp += c0 - SampleOffset(int2(-2, -2));
tmp += c0 - SampleOffset(int2( 2, -2));
tmp += c0 - SampleOffset(int2(-2, 2));
float grey = ((0.222 * tmp.r) + (0.707 * tmp.g) + (0.071 * tmp.b));
// get rid of the bottom line, as it is incorrect.
if (GetCoordinates().y*GetResolution().y < 163.0)
tmp = float4(1.0, 1.0, 1.0, 1.0);
c0 = c0 + 1.0 - grey * 7.0;
SetOutput(float4(c0.r, c0.g, c0.b, 1.0));
}
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