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procedure schneide_bloecke_aus_level_block();
  var
    img: TBmp;
    Schnitt: Trect;
begin
  img := TBmp.Create(Form1);
  img.Parent := Form1;
  img.Name := 'test';
  img.Width := 75;
  img.Height := 75;
  img.Left := 500;
  img.Top:= 500;
  img.Visible := true;
  img.Picture.Bitmap.Canvas.CopyRect(Rect(0, 0, 75, 75), TBmp(Form1.FindComponent('Block')).Picture.Bitmap.Canvas, Schnitt);
  Form1.FindComponent('test').Assign(img);
end;                    

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procedure schneide_bloecke_aus_level_block(AParent:TWinControl;Const Name:String;theBounds:Trect;Source:Timage;SourceRect:Trect);
  var
    Img:TImage;
    paintrect: Trect;
begin
  paintrect := rect(0,0,theBounds.Right - theBounds.Left,theBounds.Bottom - theBounds.top);
  img := Timage.Create(AParent);
  with img do
    begin
     Parent := AParent;
     Name := 'test';
     boundsrect := theBounds;
     Canvas.FillRect(paintrect);
    end;

  img.Picture.Bitmap.Canvas.CopyRect(Paintrect,Source.Picture.Bitmap.Canvas  , SourceRect);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
     schneide_bloecke_aus_level_block(Form1,'test',Rect(500,500,575,575),Image1,Rect(0,0,75,75));
end