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ImaDes := TBitmap.Create; 
ImaDes.Height := 19 ;
ImaDes.Width := 50;

// versuche mit diesem Befehl das untergrund Transparent zu bekommen, 
ImaDes.Canvas.Brush.Style := bsclear; 

ImaDes.Canvas.Font.Color := clblack;
ImaDes.Canvas.Font.Style := [];
ImaDes.Canvas.Font.Size  := iSize;

ImaDes.Canvas.TextOut(0,0,'Mein Text');					

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var bmp:TBitmap;
begin
  bmp:=TBitmap.create;
  bmp.width:=100;
  bmp.height:=20;
  bmp.Canvas.TextOut(0,0,'Test');
  bmp.TransparentColor:=bmp.Canvas.Pixels[0,0];
  bmp.Transparent:=true;
  canvas.Draw(0,0,bmp);
  bmp.free;
end;					

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procedure TForm1.Button4Click(Sender: TObject);
var bmp:TBitmap;
    c:TCanvas;
begin
  bmp:=TBitmap.create;
  bmp.width:=100;
  bmp.height:=20;
  bmp.canvas.pen.color:=clred;
  bmp.Canvas.Pen.width:=2;
  bmp.Canvas.Brush.Style:=bsClear;
  bmp.Canvas.TextOut(1,1,'Test');
  bmp.TransparentColor:=bmp.Canvas.Pixels[0,0];
  bmp.Transparent:=true;
  c:=TCanvas.Create;
  c.Handle:=GetDC(richedit1.Handle);
  c.Draw(4,4,bmp);
  c.free;
  bmp.free;
end;					

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  RichEdit1.Color := clGreen;					

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unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    RichEdit1: TRichEdit;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Déclarations privées }
  public
    { Déclarations publiques }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);

 var bmp:TBitmap;
    c:TCanvas;
begin
  bmp:=TBitmap.create;
  bmp.width:=100;
  bmp.height:=20;
  bmp.canvas.pen.color:=clred;
  bmp.Canvas.Pen.width:=2;
  bmp.Canvas.Brush.Style:=bsClear;
  bmp.Canvas.TextOut(1,1,'Test');
  bmp.TransparentColor:=bmp.Canvas.Pixels[0,0];
  bmp.Transparent:=true;
  c:=TCanvas.Create;
  c.Handle:=GetDC(richedit1.Handle);
  c.Draw(4,4,bmp);
  c.free;
  bmp.free;
end;

end.