BMP > RTF

function BitmapToRTF(pict: TBitmap): string; 
var 
  bi, bb, rtf: string; 
  bis, bbs: Cardinal; 
  achar: ShortString; 
  hexpict: string; 
  I: Integer; 
begin 
  GetDIBSizes(pict.Handle, bis, bbs); 
  SetLength(bi, bis); 
  SetLength(bb, bbs); 
  GetDIB(pict.Handle, pict.Palette, PChar(bi)^, PChar(bb)^); 
  rtf := '{\rtf1 {\pict\dibitmap0 '; 
  SetLength(hexpict, (Length(bb) + Length(bi)) * 2); 
  I := 2; 
  for bis := 1 to Length(bi) do 
  begin 
    achar := IntToHex(Integer(bi[bis]), 2); 
    hexpict[I - 1] := achar[1]; 
    hexpict[I] := achar[2]; 
    Inc(I, 2); 
  end; 
  for bbs := 1 to Length(bb) do 
  begin 
    achar := IntToHex(Integer(bb[bbs]), 2); 
    hexpict[I - 1] := achar[1]; 
    hexpict[I] := achar[2]; 
    Inc(I, 2); 
  end; 
  rtf := rtf + hexpict + ' }}'; 
  Result := rtf; 
end; 

Взято с сайта https://www.swissdelphicenter.ch/en/tipsindex.php