Created attachment 23651 [details]
An example document with Type3 fonts

(Tested with poppler 0.8.7 and 0.10.4.)

Splash backend anti-aliases Type3 fonts even if explicitly asked not to do so:

$ pdftoppm -aa no type3.pdf | ppmhist
   r     g     b   	 lum 	 count
 ----- ----- ----- 	-----	-------
   255   255   255	  255	  24481
     0     0     0	    0	    768
    64    64    64	   64	    550
   191   191   191	  191	    104
   127   127   127	  127	     90
   239   239   239	  239	     80
    16    16    16	   16	     74
    48    48    48	   48	     48
   159   159   159	  159	     44
    96    96    96	   96	     43
   207   207   207	  207	     42
   175   175   175	  175	     41
    32    32    32	   32	     32
    80    80    80	   80	     31
   223   223   223	  223	     31
   112   112   112	  112	     30
    51    51    51	   51	     24
   143   143   143	  143	     21
   106   106   106	  106	      4
   102   102   102	  102	      4
    76    76    76	   76	      4
   115   115   115	  115	      3
    89    89    89	   89	      3
   212   212   212	  212	      3
   178   178   178	  178	      3
   229   229   229	  229	      3
   234   234   234	  234	      2
   204   204   204	  204	      2
    25    25    25	   25	      2
    13    13    13	   13	      2
   217   217   217	  217	      2
   153   153   153	  153	      1
    85    85    85	   85	      1
   242   242   242	  242	      1
    17    17    17	   17	      1
   170   170   170	  170	      1
   166   166   166	  166	      1
   140   140   140	  140	      1
    42    42    42	   42	      1
    38    38    38	   38	      1