diff --git a/rtengine/camconst.json b/rtengine/camconst.json
index 295826826..5c00bfe21 100755
--- a/rtengine/camconst.json
+++ b/rtengine/camconst.json
@@ -320,6 +320,11 @@ than measure white levels). If you experience a black level issue it's more
 likely due to a format parsing bug which should be fixed in DCRaw and/or
 RawTherapee's raw format parser.
 
+How does a black level issue look? If the image has a color cast and is
+possibly duller than normal it's likely that black levels are off. The color
+cast is typically stronger in darker colors but it can be hard to see, it's
+more often experienced as a cast over the whole image.
+
 */
 {"camera_constants": [
 
diff --git a/rtengine/dcraw.cc b/rtengine/dcraw.cc
index ea2e8b708..add80ba15 100644
--- a/rtengine/dcraw.cc
+++ b/rtengine/dcraw.cc
@@ -5278,6 +5278,7 @@ guess_cfa_pc:
 	break;
       case 61450:
 	blrr = blrc = 2;
+        if (filters == UINT_MAX) filters = 0x94949494; /* RT: Fuji X100 fix for dcraw 9.19 to get proper black level parsing, hopefully works for other Fuji cameras too! */
       case 50714:			/* BlackLevel */
 	black = getreal(type);
 	if ((unsigned)(filters+1) < 1000) break;
diff --git a/rtengine/dcraw.patch b/rtengine/dcraw.patch
old mode 100644
new mode 100755
index 688623980..13727dbf0
--- a/rtengine/dcraw.patch
+++ b/rtengine/dcraw.patch
@@ -1,5 +1,5 @@
---- dcraw.c	2013-08-12 09:32:14.000000000 +0200
-+++ dcraw.cc	2013-11-03 10:34:08.000000000 +0100
+--- dcraw.c	2013-11-07 16:47:20.881721251 +0100
++++ dcraw.cc	2013-11-18 11:32:46.856425587 +0100
 @@ -1,3 +1,15 @@
 +/*RT*/#include <glib.h>
 +/*RT*/#include <glib/gstdio.h>
@@ -700,7 +700,15 @@
  
    if (tiff_nifds >= sizeof tiff_ifd / sizeof tiff_ifd[0])
      return 1;
-@@ -5737,12 +5368,13 @@
+@@ -5647,6 +5278,7 @@
+ 	break;
+       case 61450:
+ 	blrr = blrc = 2;
++        if (filters == UINT_MAX) filters = 0x94949494; /* RT: Fuji X100 fix for dcraw 9.19 to get proper black level parsing, hopefully works for other Fuji cameras too! */
+       case 50714:			/* BlackLevel */
+ 	black = getreal(type);
+ 	if ((unsigned)(filters+1) < 1000) break;
+@@ -5737,12 +5369,13 @@
      fread (buf, sony_length, 1, ifp);
      sony_decrypt (buf, sony_length/4, 1, sony_key);
      sfp = ifp;
@@ -720,7 +728,7 @@
      ifp = sfp;
      free (buf);
    }
-@@ -5766,6 +5398,7 @@
+@@ -5766,6 +5399,7 @@
  int CLASS parse_tiff (int base)
  {
    int doff;
@@ -728,7 +736,7 @@
  
    fseek (ifp, base, SEEK_SET);
    order = get2();
-@@ -5843,7 +5476,7 @@
+@@ -5843,7 +5477,7 @@
  	  case  8: load_raw = &CLASS eight_bit_load_raw;	break;
  	  case 12: if (tiff_ifd[raw].phint == 2)
  		     load_flags = 6;
@@ -737,7 +745,7 @@
  	  case 14: load_flags = 0;
  	  case 16: load_raw = &CLASS unpacked_load_raw;
  		   if (!strncmp(make,"OLYMPUS",7) &&
-@@ -5959,7 +5592,7 @@
+@@ -5959,7 +5593,7 @@
  {
    const char *file, *ext;
    char *jname, *jfile, *jext;
@@ -746,7 +754,7 @@
  
    ext  = strrchr (ifname, '.');
    file = strrchr (ifname, '/');
-@@ -5981,13 +5614,14 @@
+@@ -5981,13 +5615,14 @@
    } else
      while (isdigit(*--jext)) {
        if (*jext != '9') {
@@ -763,7 +771,7 @@
        if (verbose)
  	fprintf (stderr,_("Reading metadata from %s ...\n"), jname);
        parse_tiff (12);
-@@ -6330,7 +5964,11 @@
+@@ -6330,7 +5965,11 @@
      order = get2();
      hlen  = get4();
      if (get4() == 0x48454150)		/* "HEAP" */
@@ -775,7 +783,7 @@
      if (parse_tiff (save+6)) apply_tiff();
      fseek (ifp, save+len, SEEK_SET);
    }
-@@ -6582,7 +6220,8 @@
+@@ -6582,7 +6221,8 @@
  {
    static const struct {
      const char *prefix;
@@ -785,7 +793,7 @@
    } table[] = {
      { "AgfaPhoto DC-833m", 0, 0,	/* DJC */
  	{ 11438,-3762,-1115,-2409,9914,2497,-1227,2295,5300 } },
-@@ -7383,6 +7022,27 @@
+@@ -7383,6 +7023,27 @@
        }
        break;
      }
@@ -813,7 +821,7 @@
  }
  
  void CLASS simple_coeff (int index)
-@@ -7682,13 +7342,20 @@
+@@ -7682,13 +7343,20 @@
    fread (head, 1, 32, ifp);
    fseek (ifp, 0, SEEK_END);
    flen = fsize = ftell(ifp);
@@ -836,7 +844,7 @@
        parse_ciff (hlen, flen-hlen, 0);
        load_raw = &CLASS canon_load_raw;
      } else if (parse_tiff(0)) apply_tiff();
-@@ -7734,6 +7401,7 @@
+@@ -7734,6 +7402,7 @@
      fseek (ifp, 100+28*(shot_select > 0), SEEK_SET);
      parse_tiff (data_offset = get4());
      parse_tiff (thumb_offset+12);
@@ -844,7 +852,7 @@
      apply_tiff();
    } else if (!memcmp (head,"RIFF",4)) {
      fseek (ifp, 0, SEEK_SET);
-@@ -7839,15 +7507,18 @@
+@@ -7839,15 +7508,18 @@
    if (make[0] == 0) parse_smal (0, flen);
    if (make[0] == 0) {
      parse_jpeg(0);
@@ -872,7 +880,7 @@
    }
  
    for (i=0; i < sizeof corp / sizeof *corp; i++)
-@@ -7878,7 +7549,7 @@
+@@ -7878,7 +7550,7 @@
    if (height == 3136 && width == 4864)  /* Pentax K20D and Samsung GX20 */
      { height  = 3124;   width  = 4688; filters = 0x16161616; }
    if (width == 4352 && (!strcmp(model,"K-r") || !strcmp(model,"K-x")))
@@ -881,7 +889,7 @@
    if (width >= 4960 && !strncmp(model,"K-5",3))
      { left_margin = 10; width  = 4950; filters = 0x16161616; }
    if (width == 4736 && !strcmp(model,"K-7"))
-@@ -8026,7 +7697,7 @@
+@@ -8026,7 +7698,7 @@
      width -= 44;
    } else if (!strcmp(model,"D3200") ||
  	     !strcmp(model,"D600")  ||
@@ -890,7 +898,7 @@
      width -= 46;
    } else if (!strcmp(model,"D4")) {
      width -= 52;
-@@ -8630,195 +8301,8 @@
+@@ -8630,195 +8302,8 @@
    cmsCloseProfile (hInProfile);
  }
  #endif
@@ -1088,7 +1096,7 @@
  
  struct tiff_tag {
    ushort tag, type;
-@@ -8841,584 +8325,12 @@
+@@ -8841,584 +8326,12 @@
    unsigned gps[26];
    char desc[512], make[64], model[64], soft[32], date[20], artist[64];
  };