diff --git a/rtengine/dcraw.cc b/rtengine/dcraw.cc
index 3f5f24bb5..ca75eec21 100644
--- a/rtengine/dcraw.cc
+++ b/rtengine/dcraw.cc
@@ -2434,6 +2434,7 @@ void CLASS sony_arw2_load_raw()
   }
   free (data);
   maximum = curve[0x7ff << 1]; // RT: fix maximum.
+  maximum = 16300; // RT: conservative white level tested on various ARW2 cameras. This constant was set in 2013-12-17, may need re-evaluation in the future.
 }
 
 void CLASS samsung_load_raw()
diff --git a/rtengine/dcraw.patch b/rtengine/dcraw.patch
index 5fb069f00..da8ff4f14 100755
--- a/rtengine/dcraw.patch
+++ b/rtengine/dcraw.patch
@@ -1,5 +1,5 @@
 --- dcraw.c	2013-11-07 16:47:20.881721251 +0100
-+++ dcraw.cc	2013-12-16 15:36:08.177247923 +0100
++++ dcraw.cc	2013-12-17 15:35:08.487517380 +0100
 @@ -1,3 +1,15 @@
 +/*RT*/#include <glib.h>
 +/*RT*/#include <glib/gstdio.h>
@@ -274,7 +274,7 @@
    merror (data, "sony_arw2_load_raw()");
    for (row=0; row < height; row++) {
      fread (data, 1, raw_width, ifp);
-@@ -2464,11 +2428,12 @@
+@@ -2464,11 +2428,13 @@
  	  bit += 7;
  	}
        for (i=0; i < 16; i++, col+=2)
@@ -285,10 +285,11 @@
    }
    free (data);
 +  maximum = curve[0x7ff << 1]; // RT: fix maximum.
++  maximum = 16300; // RT: conservative white level tested on various ARW2 cameras. This constant was set in 2013-12-17, may need re-evaluation in the future.
  }
  
  void CLASS samsung_load_raw()
-@@ -2690,7 +2655,7 @@
+@@ -2690,7 +2656,7 @@
  
  void CLASS foveon_decoder (unsigned size, unsigned code)
  {
@@ -297,7 +298,7 @@
    struct decode *cur;
    int i, len;
  
-@@ -4002,240 +3967,9 @@
+@@ -4002,240 +3968,9 @@
  	image[row*width+col][c] = sum[c] / sum[c+4];
      }
  }
@@ -540,7 +541,7 @@
  
  void CLASS cielab (ushort rgb[3], short lab[3])
  {
-@@ -4496,112 +4230,7 @@
+@@ -4496,112 +4231,7 @@
  }
  #undef fcol
  
@@ -653,7 +654,7 @@
  #undef TS
  
  void CLASS median_filter()
-@@ -4771,7 +4400,7 @@
+@@ -4771,7 +4401,7 @@
    }
  }
  
@@ -662,7 +663,7 @@
  
  void CLASS parse_makernote (int base, int uptag)
  {
-@@ -5177,7 +4806,7 @@
+@@ -5177,7 +4807,7 @@
    { "","DCB2","Volare","Cantare","CMost","Valeo 6","Valeo 11","Valeo 22",
      "Valeo 11p","Valeo 17","","Aptus 17","Aptus 22","Aptus 75","Aptus 65",
      "Aptus 54S","Aptus 65S","Aptus 75S","AFi 5","AFi 6","AFi 7",
@@ -671,7 +672,7 @@
    float romm_cam[3][3];
  
    fseek (ifp, offset, SEEK_SET);
-@@ -5265,6 +4894,8 @@
+@@ -5265,6 +4895,8 @@
        wbi = -2;
      }
      if (tag == 2118) wbtemp = getint(type);
@@ -680,7 +681,7 @@
      if (tag == 2130 + wbi)
        FORC3 mul[c] = getreal(type);
      if (tag == 2140 + wbi && wbi >= 0)
-@@ -5284,8 +4915,8 @@
+@@ -5284,8 +4916,8 @@
    }
  }
  
@@ -691,7 +692,7 @@
  
  int CLASS parse_tiff_ifd (int base)
  {
-@@ -5299,7 +4930,7 @@
+@@ -5299,7 +4931,7 @@
    unsigned sony_curve[] = { 0,0,0,0,0,4095 };
    unsigned *buf, sony_offset=0, sony_length=0, sony_key=0;
    struct jhead jh;
@@ -700,7 +701,7 @@
  
    if (tiff_nifds >= sizeof tiff_ifd / sizeof tiff_ifd[0])
      return 1;
-@@ -5647,6 +5278,7 @@
+@@ -5647,6 +5279,7 @@
  	break;
        case 61450:
  	blrr = blrc = 2;
@@ -708,7 +709,7 @@
        case 50714:			/* BlackLevel */
  	black = getreal(type);
  	if ((unsigned)(filters+1) < 1000) break;
-@@ -5737,12 +5369,13 @@
+@@ -5737,12 +5370,13 @@
      fread (buf, sony_length, 1, ifp);
      sony_decrypt (buf, sony_length/4, 1, sony_key);
      sfp = ifp;
@@ -728,7 +729,7 @@
      ifp = sfp;
      free (buf);
    }
-@@ -5766,6 +5399,7 @@
+@@ -5766,6 +5400,7 @@
  int CLASS parse_tiff (int base)
  {
    int doff;
@@ -736,7 +737,7 @@
  
    fseek (ifp, base, SEEK_SET);
    order = get2();
-@@ -5843,7 +5477,7 @@
+@@ -5843,7 +5478,7 @@
  	  case  8: load_raw = &CLASS eight_bit_load_raw;	break;
  	  case 12: if (tiff_ifd[raw].phint == 2)
  		     load_flags = 6;
@@ -745,7 +746,7 @@
  	  case 14: load_flags = 0;
  	  case 16: load_raw = &CLASS unpacked_load_raw;
  		   if (!strncmp(make,"OLYMPUS",7) &&
-@@ -5959,7 +5593,7 @@
+@@ -5959,7 +5594,7 @@
  {
    const char *file, *ext;
    char *jname, *jfile, *jext;
@@ -754,7 +755,7 @@
  
    ext  = strrchr (ifname, '.');
    file = strrchr (ifname, '/');
-@@ -5981,13 +5615,14 @@
+@@ -5981,13 +5616,14 @@
    } else
      while (isdigit(*--jext)) {
        if (*jext != '9') {
@@ -771,7 +772,7 @@
        if (verbose)
  	fprintf (stderr,_("Reading metadata from %s ...\n"), jname);
        parse_tiff (12);
-@@ -6330,7 +5965,11 @@
+@@ -6330,7 +5966,11 @@
      order = get2();
      hlen  = get4();
      if (get4() == 0x48454150)		/* "HEAP" */
@@ -783,7 +784,7 @@
      if (parse_tiff (save+6)) apply_tiff();
      fseek (ifp, save+len, SEEK_SET);
    }
-@@ -6582,7 +6221,8 @@
+@@ -6582,7 +6222,8 @@
  {
    static const struct {
      const char *prefix;
@@ -793,7 +794,7 @@
    } table[] = {
      { "AgfaPhoto DC-833m", 0, 0,	/* DJC */
  	{ 11438,-3762,-1115,-2409,9914,2497,-1227,2295,5300 } },
-@@ -7383,6 +7023,27 @@
+@@ -7383,6 +7024,27 @@
        }
        break;
      }
@@ -821,7 +822,7 @@
  }
  
  void CLASS simple_coeff (int index)
-@@ -7682,13 +7343,20 @@
+@@ -7682,13 +7344,20 @@
    fread (head, 1, 32, ifp);
    fseek (ifp, 0, SEEK_END);
    flen = fsize = ftell(ifp);
@@ -844,7 +845,7 @@
        parse_ciff (hlen, flen-hlen, 0);
        load_raw = &CLASS canon_load_raw;
      } else if (parse_tiff(0)) apply_tiff();
-@@ -7734,6 +7402,7 @@
+@@ -7734,6 +7403,7 @@
      fseek (ifp, 100+28*(shot_select > 0), SEEK_SET);
      parse_tiff (data_offset = get4());
      parse_tiff (thumb_offset+12);
@@ -852,7 +853,7 @@
      apply_tiff();
    } else if (!memcmp (head,"RIFF",4)) {
      fseek (ifp, 0, SEEK_SET);
-@@ -7839,15 +7508,18 @@
+@@ -7839,15 +7509,18 @@
    if (make[0] == 0) parse_smal (0, flen);
    if (make[0] == 0) {
      parse_jpeg(0);
@@ -880,7 +881,7 @@
    }
  
    for (i=0; i < sizeof corp / sizeof *corp; i++)
-@@ -7878,7 +7550,7 @@
+@@ -7878,7 +7551,7 @@
    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")))
@@ -889,7 +890,7 @@
    if (width >= 4960 && !strncmp(model,"K-5",3))
      { left_margin = 10; width  = 4950; filters = 0x16161616; }
    if (width == 4736 && !strcmp(model,"K-7"))
-@@ -8026,7 +7698,7 @@
+@@ -8026,7 +7699,7 @@
      width -= 44;
    } else if (!strcmp(model,"D3200") ||
  	     !strcmp(model,"D600")  ||
@@ -898,7 +899,7 @@
      width -= 46;
    } else if (!strcmp(model,"D4")) {
      width -= 52;
-@@ -8630,195 +8302,8 @@
+@@ -8630,195 +8303,8 @@
    cmsCloseProfile (hInProfile);
  }
  #endif
@@ -1096,7 +1097,7 @@
  
  struct tiff_tag {
    ushort tag, type;
-@@ -8841,584 +8326,12 @@
+@@ -8841,584 +8327,12 @@
    unsigned gps[26];
    char desc[512], make[64], model[64], soft[32], date[20], artist[64];
  };