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doc/filters: add RGB geq example
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@ -4111,6 +4111,12 @@ Generate a quick emboss effect:
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@example
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format=gray,geq=lum_expr='(p(X,Y)+(256-p(X-4,Y-4)))/2'
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@end example
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@item
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Modify RGB components depending on pixel position:
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@example
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geq=r='X/W*r(X,Y)':g='(1-X/W)*g(X,Y)':b='(H-Y)/H*b(X,Y)'
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@end example
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@end itemize
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@section gradfun
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