{Максимальные значения }
Const
 HLSMAX = 240;
 RGBMAX = 255;
 UNDEFINED = (HLSMAX*2) div 3;
Var
 H, L, S : integer; { H-оттенок, L-яркость, S-насыщенность }
 R, G, B : integer; { цвета }
procedure RGBtoHLS;
Var
 cMax,cMin : integer;
 Rdelta,Gdelta,Bdelta : single;
Begin
  cMax := max( max(R,G), B);
  cMin := min( min(R,G), B);
  L := round( ( ((cMax+cMin)*HLSMAX) + RGBMAX )/(2*RGBMAX) );
  if (cMax = cMin) then begin
  S := 0; H := UNDEFINED;
  end else begin
  if (L <= (HLSMAX/2)) then
  S := round( ( ((cMax-cMin)*HLSMAX) + ((cMax+cMin)/2) ) / (cMax+cMin) )
  else
  S := round( ( ((cMax-cMin)*HLSMAX) + ((2*RGBMAX-cMax-cMin)/2) )
  / (2*RGBMAX-cMax-cMin) );
  Rdelta := ( ((cMax-R)*(HLSMAX/6)) + ((cMax-cMin)/2) ) / (cMax-cMin);
  Gdelta := ( ((cMax-G)*(HLSMAX/6)) + ((cMax-cMin)/2) ) / (cMax-cMin);
  Bdelta := ( ((cMax-B)*(HLSMAX/6)) + ((cMax-cMin)/2) ) / (cMax-cMin);
  if (R = cMax) then H := round(Bdelta - Gdelta)
  else if (G = cMax) then H := round( (HLSMAX/3) + Rdelta - Bdelta)
  else H := round( ((2*HLSMAX)/3) + Gdelta - Rdelta );
  if (H < 0) then H:=H + HLSMAX;
  if (H > HLSMAX) then H:= H - HLSMAX;
  end;
  if S<0 then S:=0; if S>HLSMAX then S:=HLSMAX;
  if L<0 then L:=0; if L>HLSMAX then L:=HLSMAX;
end;

procedure HLStoRGB;
Var
 Magic1,Magic2 : single;
 function HueToRGB(n1,n2,hue : single) : single;
 begin
  if (hue < 0) then hue := hue+HLSMAX;
  if (hue > HLSMAX) then hue:=hue -HLSMAX;
  if (hue < (HLSMAX/6)) then
  result:= ( n1 + (((n2-n1)*hue+(HLSMAX/12))/(HLSMAX/6)) )
  else
  if (hue < (HLSMAX/2)) then result:=n2 else
  if (hue < ((HLSMAX*2)/3)) then
  result:= ( n1 + (((n2-n1)*(((HLSMAX*2)/3)-hue)+(HLSMAX/12))/(HLSMAX/6)))
  else result:= ( n1 );
 end;
begin
  if (S = 0) then begin
  B:=round( (L*RGBMAX)/HLSMAX ); R:=B; G:=B;
  end else begin
  if (L <= (HLSMAX/2)) then Magic2 := (L*(HLSMAX + S) + (HLSMAX/2))/HLSMAX
  else Magic2 := L + S - ((L*S) + (HLSMAX/2))/HLSMAX;
  Magic1 := 2*L-Magic2;
  R := round( (HueToRGB(Magic1,Magic2,H+(HLSMAX/3))*RGBMAX + (HLSMAX/2))/HLSMAX );
  G := round( (HueToRGB(Magic1,Magic2,H)*RGBMAX + (HLSMAX/2)) / HLSMAX );
  B := round( (HueToRGB(Magic1,Magic2,H-(HLSMAX/3))*RGBMAX + (HLSMAX/2))/HLSMAX );
  end;
  if R<0 then R:=0; if R>RGBMAX then R:=RGBMAX;
  if G<0 then G:=0; if G>RGBMAX then G:=RGBMAX;
  if B<0 then B:=0; if B>RGBMAX then B:=RGBMAX;
end;