unit1.pas

image convert sample

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ExtCtrls;

type
  TForm1 = class(TForm)
    Image1: TImage;
    procedure FormCreate(Sender: TObject);
    procedure Image1MouseUp(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  bmp  :  TBitmap;
  clr2 :  TColor ;
implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  bmp := TBitmap.Create;

  Image1.Picture.LoadFromFile('test.bmp');
  self.DoubleBuffered :=true;
end;

procedure TForm1.Image1MouseUp(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  bmp.Width:=Image1.Width;
  bmp.Height:=Image1.Height;
  bmp.Canvas.StretchDraw(Rect(0,0,bmp.Width,bmp.Height),Image1.Picture.Bitmap);

   clr2:=bmp.Canvas.Pixels[X,Y];
  if clr2=clYellow then ShowMessage('Yellow');
  if clr2=clBlue then ShowMessage('clBlue');
  if clr2=clRed then ShowMessage('clRed');
  if clr2=clBlack then ShowMessage('clBlack');
  if clr2=clWhite then ShowMessage('clWhite');
  if clr2=clFuchsia then ShowMessage('clFuchsia');

end;

end.