diff --git a/backend/teco3.c b/backend/teco3.c
index 93cd55a3f..3db284af7 100644
--- a/backend/teco3.c
+++ b/backend/teco3.c
@@ -48,7 +48,7 @@
 
 /*--------------------------------------------------------------------------*/
 
-#define BUILD 0			/* 2002/04/21 */
+#define BUILD 1			/* 2002/08/06 */
 #define BACKEND_NAME teco3
 #define TECO_CONFIG_FILE "teco3.conf"
 
@@ -132,6 +132,14 @@ static const int dither_val[] = {
 
 /*--------------------------------------------------------------------------*/
 
+static const SANE_Range threshold_range = {
+  0,				/* minimum */
+  255,				/* maximum */
+  0				/* quantization */
+};
+
+/*--------------------------------------------------------------------------*/
+
 /* Define the supported scanners and their characteristics. */
 static const struct scanners_supported scanners[] = {
   {
@@ -501,14 +509,17 @@ teco_set_window (Teco_Scanner * dev)
   switch (dev->scan_mode)
     {
     case TECO_BW:
+      window[31] = dev->val[OPT_THRESHOLD].w;
       window[33] = 0x00;
       i = get_string_list_index (dither_list, dev->val[OPT_DITHER].s);
       window[36] = dither_val[i];
       break;
     case TECO_GRAYSCALE:
+	  window[31] = 0x80;
       window[33] = 0x02;
       break;
     case TECO_COLOR:
+	  window[31] = 0x80;
       window[33] = 0x05;
       break;
     }
@@ -517,7 +528,6 @@ teco_set_window (Teco_Scanner * dev)
   window[34] = dev->depth;
 
   /* Unknown - invariants */
-  window[31] = 0x80;
   window[37] = 0x80;
 
   switch (dev->def->tecoref)
@@ -1032,6 +1042,18 @@ teco_init_options (Teco_Scanner * dev)
   dev->opt[OPT_GAMMA_VECTOR_GRAY].constraint.range = &gamma_range;
   dev->val[OPT_GAMMA_VECTOR_GRAY].wa = dev->gamma_GRAY;
 
+  /* Threshold */
+  dev->opt[OPT_THRESHOLD].name = SANE_NAME_THRESHOLD;
+  dev->opt[OPT_THRESHOLD].title = SANE_TITLE_THRESHOLD;
+  dev->opt[OPT_THRESHOLD].desc = SANE_DESC_THRESHOLD;
+  dev->opt[OPT_THRESHOLD].type = SANE_TYPE_INT;
+  dev->opt[OPT_THRESHOLD].unit = SANE_UNIT_NONE;
+  dev->opt[OPT_THRESHOLD].size = sizeof (SANE_Int);
+  dev->opt[OPT_THRESHOLD].cap |= SANE_CAP_INACTIVE;
+  dev->opt[OPT_THRESHOLD].constraint_type = SANE_CONSTRAINT_RANGE;
+  dev->opt[OPT_THRESHOLD].constraint.range = &threshold_range;
+  dev->val[OPT_THRESHOLD].w = 128;
+
   /* preview */
   dev->opt[OPT_PREVIEW].name = SANE_NAME_PREVIEW;
   dev->opt[OPT_PREVIEW].title = SANE_TITLE_PREVIEW;
@@ -1678,6 +1700,7 @@ sane_control_option (SANE_Handle handle, SANE_Int option,
 	case OPT_TL_X:
 	case OPT_BR_X:
 	case OPT_CUSTOM_GAMMA:
+	case OPT_THRESHOLD:
 	case OPT_PREVIEW:
 	  *(SANE_Word *) val = dev->val[option].w;
 	  return SANE_STATUS_GOOD;
@@ -1724,6 +1747,7 @@ sane_control_option (SANE_Handle handle, SANE_Int option,
 	case OPT_BR_Y:
 	case OPT_TL_X:
 	case OPT_BR_X:
+	case OPT_THRESHOLD:
 	case OPT_RESOLUTION:
 	  if (info)
 	    {
@@ -1757,12 +1781,14 @@ sane_control_option (SANE_Handle handle, SANE_Int option,
 	  dev->opt[OPT_GAMMA_VECTOR_G].cap |= SANE_CAP_INACTIVE;
 	  dev->opt[OPT_GAMMA_VECTOR_B].cap |= SANE_CAP_INACTIVE;
 	  dev->opt[OPT_GAMMA_VECTOR_GRAY].cap |= SANE_CAP_INACTIVE;
+	  dev->opt[OPT_THRESHOLD].cap |= SANE_CAP_INACTIVE;
 
 	  if (strcmp (dev->val[OPT_MODE].s, BLACK_WHITE_STR) == 0)
 	    {
 	      dev->depth = 8;
 	      dev->scan_mode = TECO_BW;
 	      dev->opt[OPT_DITHER].cap &= ~SANE_CAP_INACTIVE;
+	      dev->opt[OPT_THRESHOLD].cap &= ~SANE_CAP_INACTIVE;
 	    }
 	  else if (strcmp (dev->val[OPT_MODE].s, GRAY_STR) == 0)
 	    {
diff --git a/backend/teco3.h b/backend/teco3.h
index 5b96dd486..59186a9c5 100644
--- a/backend/teco3.h
+++ b/backend/teco3.h
@@ -258,6 +258,7 @@ enum Teco_Option
   OPT_GAMMA_VECTOR_G,		/* Custom Green Gamma table */
   OPT_GAMMA_VECTOR_B,		/* Custom Blue Gamma table */
   OPT_GAMMA_VECTOR_GRAY,	/* Custom Grayscale Gamma table */
+  OPT_THRESHOLD,		/* Threshold */
   OPT_DITHER,
   OPT_PREVIEW,