unit Ugetcor;

interface

uses
  SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls,
  Forms, Dialogs, StdCtrls, ExtCtrls, Buttons;

type
  Tgetcol = class(TForm)
    Panel1: TPanel;
    Label1: TLabel;
    Label2: TLabel;
    procedure FormClick(Sender: TObject);
    procedure FormMouseMove(Sender: TObject; Shift: TShiftState; X,
      Y: Integer);
    procedure Panel1Click(Sender: TObject);
    procedure FormDblClick(Sender: TObject);
    procedure FormResize(Sender: TObject);
  private
    tx,ty : integer;
    procedure WMEraseBkng(var MSg:TWMEraseBkgnd);message WM_ERASEBKGND;
  public
    { Public declarations }
  end;

var
  getcol: Tgetcol;
implementation

{$R *.DFM}
const
  Digits : array[0..$F] of Char = '0123456789ABCDEF';

function HexB(B : Byte) : string;
  {-Return hex string for byte}
begin
  HexB[0] := #2;
  HexB[1] := Digits[B shr 4];
  HexB[2] := Digits[B and $F];
end;

procedure Tgetcol.WMEraseBkng(var MSg:TWMEraseBkgnd);
begin
     Msg.Result:=1;
end;

procedure Tgetcol.FormClick(Sender: TObject);
var t : tcolor;
r,g,b : byte;
begin
t := canvas.pixels[tx,ty];
r := getRvalue(t);
g := getGvalue(t);
B := getBvalue(t);
LABEL2.COLOR := T;
LABEL1.CAPTION := '$00' + HEXB(R) + HEXB(G) + HEXB(B);
end;

procedure Tgetcol.FormMouseMove(Sender: TObject; Shift: TShiftState; X,
  Y: Integer);
begin
tx := x;
ty := y;
end;

procedure Tgetcol.Panel1Click(Sender: TObject);
begin
CLOSE;
end;

procedure Tgetcol.FormDblClick(Sender: TObject);
begin
close;
end;

procedure Tgetcol.FormResize(Sender: TObject);
begin
panel1.top := height - panel1.height -1;
panel1.left := width - panel1.width -1;
panel1.visible := true;
end;

end.

只需要将其加入你的任意一个工程文件中，便可运行！！