Index: modules/video_filter/adjust.c
===================================================================
--- modules/video_filter/adjust.c	(revision 13784)
+++ modules/video_filter/adjust.c	(working copy)
@@ -57,6 +57,8 @@
  * Module descriptor
  *****************************************************************************/
 
+#define THRES_TEXT N_("Enable threshold")
+#define THRES_LONGTEXT N_("Show black and white pixels with brightness as threshold value")
 #define CONT_TEXT N_("Image contrast (0-2)")
 #define CONT_LONGTEXT N_("Set the image contrast, between 0 and 2. Defaults to 1")
 #define HUE_TEXT N_("Image hue (0-360)")
@@ -76,6 +78,7 @@
     set_subcategory( SUBCAT_VIDEO_VFILTER );
     set_capability( "video filter", 0 );
 
+    add_bool( "threshold", 0, NULL, THRES_TEXT, THRES_LONGTEXT, VLC_FALSE );
     add_float_with_range( "contrast", 1.0, 0.0, 2.0, NULL, CONT_TEXT, CONT_LONGTEXT, VLC_FALSE );
     add_float_with_range( "brightness", 1.0, 0.0, 2.0, NULL, LUM_TEXT, LUM_LONGTEXT, VLC_FALSE );
     add_integer_with_range( "hue", 0, 0, 360, NULL, HUE_TEXT, HUE_LONGTEXT, VLC_FALSE );
@@ -133,7 +136,8 @@
     p_vout->pf_render = Render;
     p_vout->pf_display = NULL;
     p_vout->pf_control = Control;
-    
+
+	var_Create( p_vout, "threshold", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
     var_Create( p_vout, "contrast", VLC_VAR_FLOAT | VLC_VAR_DOINHERIT );
     var_Create( p_vout, "brightness", VLC_VAR_FLOAT | VLC_VAR_DOINHERIT );
     var_Create( p_vout, "hue", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
@@ -242,6 +246,7 @@
     uint8_t *p_in, *p_in_v, *p_in_end, *p_line_end;
     uint8_t *p_out, *p_out_v;
 
+    vlc_bool_t b_thres;
     double  f_hue;
     double  f_gamma;
     int32_t i_cont, i_lum;
@@ -264,10 +269,19 @@
     vout_LinkPicture( p_vout->p_sys->p_vout, p_outpic );
 
     /* Getvariables */
+    var_Get( p_vout, "threshold", &val );
+    b_thres = (vlc_bool_t) ( val.b_bool );
     var_Get( p_vout, "contrast", &val );
     i_cont = (int) ( val.f_float * 255 );
     var_Get( p_vout, "brightness", &val );
-    i_lum = (int) (( val.f_float - 1.0 ) * 255 );
+    /*
+     * This to avoid default value setting to zero, making all screen
+     * white (in threshold mode).
+     */
+    if( b_thres != VLC_TRUE )
+        i_lum = (int) (( val.f_float - 1.0 ) * 255 );
+	else
+	    i_lum = (int) ( val.f_float * 128 );
     var_Get( p_vout, "hue", &val );
     f_hue = (float) ( val.i_int * M_PI / 180 );
     var_Get( p_vout, "saturation", &val );
@@ -275,22 +289,45 @@
     var_Get( p_vout, "gamma", &val );
     f_gamma = 1.0 / val.f_float;
 
-    /* Contrast is a fast but kludged function, so I put this gap to be
-     * cleaner :) */
-    i_lum += 128 - i_cont / 2;
+    /*
+     * Threshold mode drops out everything about contrast and gamma.
+     * Also luma behaviour is slightly modified.
+     */
+    if( b_thres != VLC_TRUE ) {
 
-    /* Fill the gamma lookup table */
-    for( i = 0 ; i < 256 ; i++ )
-    {
-      pi_gamma[ i ] = clip( pow(i / 255.0, f_gamma) * 255.0);
-    }
+		/* Contrast is a fast but kludged function, so I put this gap to be
+		 * cleaner :) */
+		i_lum += 128 - i_cont / 2;
 
-    /* Fill the luma lookup table */
-    for( i = 0 ; i < 256 ; i++ )
-    {
-        pi_luma[ i ] = pi_gamma[clip( i_lum + i_cont * i / 256)];
-    }
+		/* Fill the gamma lookup table */
+		for( i = 0 ; i < 256 ; i++ )
+		{
+		  pi_gamma[ i ] = clip( pow(i / 255.0, f_gamma) * 255.0);
+		}
 
+		/* Fill the luma lookup table */
+		for( i = 0 ; i < 256 ; i++ )
+		{
+			pi_luma[ i ] = pi_gamma[clip( i_lum + i_cont * i / 256)];
+		}
+	}
+	else
+	{
+		/*
+		 * We get luma as threshold value: the higher it is, the darker is
+		 * the image. Should I reverse this?
+		 */
+		for( i = 0 ; i < 256 ; i++ )
+		{
+			pi_luma[ i ] = (i < i_lum) ? 0 : 255;
+		}
+
+		/*
+		 * Desaturates image to avoid that strange yellow halo...
+		 */
+		i_sat = 0;
+	}
+
     /*
      * Do the Y plane
      */