```
module blank(
  input[7:0]r1,
  input[7:0]g1,
  input[7:0]b1,
  input en1,
  output reg[7:0] r2,
  output reg[7:0] g2,
  output reg[7:0] b2,
  output en2
);

always @(*)
begin 
  if ( 48 < r2 < 255  &&  0 < g2 < 223  && 0  < b2 < 196 ) 
     r2 = 255;
     g2 = 255;
     b2 = 255;
  else   
     r2 = 0;
     g2 = 0;
     b2 = 0;
end
endmodule

```

This is used for a threshold, I want it to be able to detect human skin color and turn it to white and others to black.