anchor.diff:  string2filter("background", Arg) ->
       {background,Arg};
   string2filter("lossless", []) ->
  -    {lossless}.
  +    {lossless};
  +string2filter("removebg", []) ->
  +    {removebg, 5};
  +string2filter("removebg", Arg) ->
  +    {removebg, list_to_integer(Arg)}.
   
   
   % simple ceil for positive numbers
  
positive.code:             Pix > ?PIX50 -> 50;
              true -> 100 - round(50 * (Pix - ?PIX100) / (?PIX50 - ?PIX100))
            end,
      {Width,Height, ["-quality ",integer_to_list(Q)]}.
  
  %% @spec fetch_crop(Filters) -> {Crop, Filters}
  %% @doc Split the filters into size/crop and image manipulation filters.
  
negative.code: out_mime("image/gif", _) ->
      %% gif is gif, daar kan je gif op innemen
      {"image/gif", ".gif"};
  out_mime(_Mime, Options) ->
  	case lists:member("lossless", Options) orelse proplists:is_defined(lossless, Options) of
  		false -> {"image/jpeg", ".jpg"};
  		true  -> {"image/png", ".png"}
  	end.
  
  
  %% @spec filter2arg(Filter, Width, Height) -> 
  