Updated blur, randomize, and exchange plugins (not sure if they should go

into stable, they break PDB interfaces)

-Yosh

ChangeLog

+Thu Jul  2 11:03:12 PDT 1998 Manish Singh <yosh@gimp.org>
+
+	* updated blur, randomize, and exchange plugins (not sure if
+	they should go into stable, they break PDB interfaces)
+
 Thu Jul  2 01:45:24 EEST 1998  Lauri Alanko <nether@gimp.org>
 
 	* app/Makefile.am:

plug-ins/blur/blur.c

@@ -2,7 +2,7 @@
  * This is a plugin for the GIMP v 0.99.8 or later.  Documentation is
  * available at http://www.rru.com/~meo/gimp/ .
  *
- * Copyright (C) 1997 Miles O'Neal  <meo@rru.com>  http://www.rru.com/~meo/
+ * Copyright (C) 1997-98 Miles O'Neal  <meo@rru.com>  http://www.rru.com/~meo/
  * Blur code Copyright (C) 1995 Spencer Kimball and Peter Mattis
  * GUI based on GTK code from:
  *    alienmap (Copyright (C) 1996, 1997 Daniel Cotting)
@@ -30,10 +30,10 @@
 /****************************************************************************
  * Blur:
  *
- * blur version 2.0 (6 Feb 1998, MEO)
+ * blur version 2.0 (1 May 1998, MEO)
  * history
- *     2.0 -  6 Feb 1998 MEO
- *         based on randomize 1.5
+ *     2.0 -  1 May 1998 MEO
+ *         based on randomize 1.7
  *
  * Please send any patches or suggestions to the author: meo@rru.com .
  * 
@@ -87,16 +87,16 @@
 
 typedef struct {
     gdouble blur_pct;     /* likelihood of randomization (as %age) */
+    gdouble blur_rcount;  /* repeat count */
     gint seed_type;       /* seed init. type - current time or user value */
     gint blur_seed;       /* seed value for rand() function */
-    gdouble blur_rcount;  /* repeat count */
 } BlurVals;
 
 static BlurVals pivals = {
     50.0,
+    1.0,
     SEED_TIME,
     0,
-    1.0,
 };
 
 typedef struct {
@@ -176,6 +176,8 @@ query()
         { PARAM_DRAWABLE, "drawable", "Input drawable" },
         { PARAM_FLOAT, "blur_pct", "Randomization percentage (1 - 100)" },
         { PARAM_FLOAT, "blur_rcount", "Repeat count(1 - 100)" },
+        { PARAM_INT32, "seed_type", "Seed type (10 = current time, 11 = seed value)" },
+        { PARAM_INT32, "blur_seed", "Seed value (used only if seed type is 11)" },
     };
     static int nargs = sizeof(args) / sizeof (args[0]);
 
@@ -183,7 +185,7 @@ query()
     static int nreturn_vals = 0;
 
     const char *blurb = "Apply a 3x3 blurring convolution kernel to the specified drawable.";
-    const char *help = "This function randomly blurs the specified drawable, using a 3x3 blur.  The type and percentage are user selectable.  Blurring is not supported for indexed images.";
+    const char *help = "This plug-in randomly blurs the specified drawable, using a 3x3 blur.  You control the percentage of the pixels that are blurred and the number of times blurring is applied.  Indexed images are not supported.";
     const char *author = "Miles O'Neal  <meo@rru.com>  http://www.rru.com/~meo/";
     const char *copyrights = "Miles O'Neal, Spencer Kimball, Peter Mattis, Torsten Martinsen, Brian Degenhardt, Federico Mena Quintero, Stephen Norris, Daniel Cotting";
     const char *copyright_date = "1995-1998";
@@ -266,18 +268,24 @@ run(char *name, int nparams, GParam *param, int *nreturn_vals,
  */
             case RUN_NONINTERACTIVE:
                 if ((strcmp(name, "plug_in_blur_randomize") == 0) &&
-                  (nparams == 5)) {
+                  (nparams == 7)) {
                     pivals.blur_pct = (gdouble)param[3].data.d_float;
                     pivals.blur_pct = (gdouble)MIN(100.0, pivals.blur_pct);
                     pivals.blur_pct = (gdouble)MAX(1.0, pivals.blur_pct);
                     pivals.blur_rcount = (gdouble)param[4].data.d_float;
                     pivals.blur_rcount = (gdouble)MIN(100.0,pivals.blur_rcount);
                     pivals.blur_rcount = (gdouble)MAX(1.0, pivals.blur_rcount);
+                    pivals.seed_type = (gint) param[5].data.d_int32;
+                    pivals.seed_type = (gint) MIN(SEED_USER, param[5].data.d_int32);
+                    pivals.seed_type = (gint) MAX(SEED_TIME, param[5].data.d_int32);
+                    pivals.blur_seed = (gint) param[6].data.d_int32;
                     status = STATUS_SUCCESS;
                 } else if ((strcmp(name, PLUG_IN_NAME) == 0) &&
                   (nparams == 3)) {
                     pivals.blur_pct = (gdouble) 100.0;
                     pivals.blur_rcount = (gdouble) 1.0;
+                    pivals.seed_type = SEED_TIME;
+                    pivals.blur_seed = 0;
                     status = STATUS_SUCCESS;
                 } else {
                     status = STATUS_CALLING_ERROR;
@@ -570,7 +578,6 @@ blur_dialog()
 
     gtk_init(&argc, &argv);
     gtk_rc_parse(gimp_gtkrc());
-
 /*
  *  Open a new dialog, label it and set up its
  *  destroy callback.

plug-ins/common/blur.c

@@ -2,7 +2,7 @@
  * This is a plugin for the GIMP v 0.99.8 or later.  Documentation is
  * available at http://www.rru.com/~meo/gimp/ .
  *
- * Copyright (C) 1997 Miles O'Neal  <meo@rru.com>  http://www.rru.com/~meo/
+ * Copyright (C) 1997-98 Miles O'Neal  <meo@rru.com>  http://www.rru.com/~meo/
  * Blur code Copyright (C) 1995 Spencer Kimball and Peter Mattis
  * GUI based on GTK code from:
  *    alienmap (Copyright (C) 1996, 1997 Daniel Cotting)
@@ -30,10 +30,10 @@
 /****************************************************************************
  * Blur:
  *
- * blur version 2.0 (6 Feb 1998, MEO)
+ * blur version 2.0 (1 May 1998, MEO)
  * history
- *     2.0 -  6 Feb 1998 MEO
- *         based on randomize 1.5
+ *     2.0 -  1 May 1998 MEO
+ *         based on randomize 1.7
  *
  * Please send any patches or suggestions to the author: meo@rru.com .
  * 
@@ -87,16 +87,16 @@
 
 typedef struct {
     gdouble blur_pct;     /* likelihood of randomization (as %age) */
+    gdouble blur_rcount;  /* repeat count */
     gint seed_type;       /* seed init. type - current time or user value */
     gint blur_seed;       /* seed value for rand() function */
-    gdouble blur_rcount;  /* repeat count */
 } BlurVals;
 
 static BlurVals pivals = {
     50.0,
+    1.0,
     SEED_TIME,
     0,
-    1.0,
 };
 
 typedef struct {
@@ -176,6 +176,8 @@ query()
         { PARAM_DRAWABLE, "drawable", "Input drawable" },
         { PARAM_FLOAT, "blur_pct", "Randomization percentage (1 - 100)" },
         { PARAM_FLOAT, "blur_rcount", "Repeat count(1 - 100)" },
+        { PARAM_INT32, "seed_type", "Seed type (10 = current time, 11 = seed value)" },
+        { PARAM_INT32, "blur_seed", "Seed value (used only if seed type is 11)" },
     };
     static int nargs = sizeof(args) / sizeof (args[0]);
 
@@ -183,7 +185,7 @@ query()
     static int nreturn_vals = 0;
 
     const char *blurb = "Apply a 3x3 blurring convolution kernel to the specified drawable.";
-    const char *help = "This function randomly blurs the specified drawable, using a 3x3 blur.  The type and percentage are user selectable.  Blurring is not supported for indexed images.";
+    const char *help = "This plug-in randomly blurs the specified drawable, using a 3x3 blur.  You control the percentage of the pixels that are blurred and the number of times blurring is applied.  Indexed images are not supported.";
     const char *author = "Miles O'Neal  <meo@rru.com>  http://www.rru.com/~meo/";
     const char *copyrights = "Miles O'Neal, Spencer Kimball, Peter Mattis, Torsten Martinsen, Brian Degenhardt, Federico Mena Quintero, Stephen Norris, Daniel Cotting";
     const char *copyright_date = "1995-1998";
@@ -266,18 +268,24 @@ run(char *name, int nparams, GParam *param, int *nreturn_vals,
  */
             case RUN_NONINTERACTIVE:
                 if ((strcmp(name, "plug_in_blur_randomize") == 0) &&
-                  (nparams == 5)) {
+                  (nparams == 7)) {
                     pivals.blur_pct = (gdouble)param[3].data.d_float;
                     pivals.blur_pct = (gdouble)MIN(100.0, pivals.blur_pct);
                     pivals.blur_pct = (gdouble)MAX(1.0, pivals.blur_pct);
                     pivals.blur_rcount = (gdouble)param[4].data.d_float;
                     pivals.blur_rcount = (gdouble)MIN(100.0,pivals.blur_rcount);
                     pivals.blur_rcount = (gdouble)MAX(1.0, pivals.blur_rcount);
+                    pivals.seed_type = (gint) param[5].data.d_int32;
+                    pivals.seed_type = (gint) MIN(SEED_USER, param[5].data.d_int32);
+                    pivals.seed_type = (gint) MAX(SEED_TIME, param[5].data.d_int32);
+                    pivals.blur_seed = (gint) param[6].data.d_int32;
                     status = STATUS_SUCCESS;
                 } else if ((strcmp(name, PLUG_IN_NAME) == 0) &&
                   (nparams == 3)) {
                     pivals.blur_pct = (gdouble) 100.0;
                     pivals.blur_rcount = (gdouble) 1.0;
+                    pivals.seed_type = SEED_TIME;
+                    pivals.blur_seed = 0;
                     status = STATUS_SUCCESS;
                 } else {
                     status = STATUS_CALLING_ERROR;
@@ -570,7 +578,6 @@ blur_dialog()
 
     gtk_init(&argc, &argv);
     gtk_rc_parse(gimp_gtkrc());
-
 /*
  *  Open a new dialog, label it and set up its
  *  destroy callback.

plug-ins/common/exchange.c

@@ -26,10 +26,7 @@
  * Author: robert@experimental.net
  * 
  * TODO:
- *	- preview (working on it already :)
- *	- threshold for each channel (not hard to implement, but really
- *	  needs a preview window)
- *
+ *		- locken van scales met elkaar
  */
 
 #include <stdio.h>
@@ -40,11 +37,14 @@
 /* big scales */
 #define	SCALE_WIDTH	225
 
+/* preview width/height */
+#define PREVIEW_SIZE	128
+
 /* datastructure to store parameters in */
 typedef struct
 {
 	guchar	fromred, fromgreen, fromblue, tored, togreen, toblue;
-	guchar	threshold;
+	guchar	red_threshold, green_threshold, blue_threshold;
 	gint32	image;
 	gint32	drawable;
 }	myParams;
@@ -53,15 +53,24 @@ typedef struct
 static void	query();
 static void	run(char *, int, GParam *, int *, GParam **);
 static int	doDialog();
-static void	exchange(GDrawable *);
+static void	exchange();
+static void	real_exchange(gint, gint, gint, gint, int);
 static void	doLabelAndScale(char *, GtkWidget *, guchar *);
+static void	update_preview();
 
 static void	ok_callback(GtkWidget *, gpointer);
+static void	lock_callback(GtkWidget *, gpointer);
 static void	scale_callback(GtkAdjustment *, gpointer);
 
 /* some global variables */
+GDrawable	*drw;
 myParams	xargs = { 0, 0, 0, 0, 0, 0, 0, 0, 0 };
 int		running = 0;
+GPixelRgn	origregion;
+GtkWidget	*preview;
+gint		sel_x1, sel_y1, sel_x2, sel_y2;
+gint		prev_width, prev_height, sel_width, sel_height;
+gint		lock_thres = 0;
 
 /* lets declare what we want to do */
 GPlugInInfo PLUG_IN_INFO =
@@ -90,14 +99,16 @@ void	query()
 		{ PARAM_INT8, "tored", "Red value (to)" },
 		{ PARAM_INT8, "togreen", "Green value (to)" },
 		{ PARAM_INT8, "toblue", "Blue value (to)" },
-		{ PARAM_INT8, "threshold", "Threshold" },
+		{ PARAM_INT8, "red_threshold", "Red threshold" },
+		{ PARAM_INT8, "green_threshold", "Green threshold" },
+		{ PARAM_INT8, "blue_threshold", "Blue threshold" },
 	};
 	static GParamDef *return_vals = NULL;
 	static int nargs = sizeof(args) / sizeof(args[0]);
 	static int nreturn_vals = 0;
 
 	gimp_install_procedure("plug_in_exchange",
-			       "Color exchange",
+			       "Color Exchange",
 			       "Exchange one color with another, optionally setting a threshold to convert from one shade to another",
 			       "robert@experimental.net",
 			       "robert@experimental.net",
@@ -115,7 +126,6 @@ void	run(char *name, int nparams, GParam *param, int *nreturn_vals, GParam **ret
 {
 	static GParam	values[1];
 	GRunModeType	runmode;
-	GDrawable 	*drawable;
 	gint32  	imageID;
 	GStatusType 	status = STATUS_SUCCESS;
 
@@ -128,19 +138,27 @@ void	run(char *name, int nparams, GParam *param, int *nreturn_vals, GParam **ret
 	switch (runmode = param[0].data.d_int32)
 	{
 		case RUN_INTERACTIVE:
-
-
-
-
 				/* retrieve stored arguments (if any) */
 				gimp_get_data("plug_in_exchange", &xargs);
 				/* initialize using foreground color */
 				gimp_palette_get_foreground(&xargs.fromred, &xargs.fromgreen, &xargs.fromblue);
 				if (!xargs.image && !xargs.drawable)
-					xargs.threshold = 0;
+					xargs.red_threshold = xargs.green_threshold = xargs.blue_threshold = 0;
 				/* and initialize some other things */
 				xargs.image = param[1].data.d_image;
 				xargs.drawable = param[2].data.d_drawable;
+				drw = gimp_drawable_get(param[2].data.d_drawable);
+				gimp_drawable_mask_bounds(drw->id, &sel_x1, &sel_y1, &sel_x2, &sel_y2);
+				sel_width = sel_x2 - sel_x1;
+				sel_height = sel_y2 - sel_y1;
+				if (sel_width > PREVIEW_SIZE)
+						prev_width = PREVIEW_SIZE;
+				else
+						prev_width = sel_width;
+				if (sel_height > PREVIEW_SIZE)
+						prev_height = PREVIEW_SIZE;
+				else
+						prev_height = sel_height;
 				if (!doDialog())
 					return;
 				break;
@@ -153,35 +171,32 @@ void	run(char *name, int nparams, GParam *param, int *nreturn_vals, GParam **ret
 				gimp_palette_get_foreground(&xargs.fromred, &xargs.fromgreen, &xargs.fromblue);
 				break;
 		case RUN_NONINTERACTIVE:
-		  if(nparams != 10)
-		    status = STATUS_EXECUTION_ERROR;
-		  if (status == STATUS_SUCCESS)
-		    {
-		      xargs.fromred = param[3].data.d_int8;
-		      xargs.fromgreen = param[4].data.d_int8;
-		      xargs.fromblue = param[5].data.d_int8;
-		      xargs.tored = param[6].data.d_int8;
-		      xargs.togreen = param[7].data.d_int8;
-		      xargs.toblue = param[8].data.d_int8;
-		      xargs.threshold = param[9].data.d_int32;
-		    }
-		  break;
-			
+				if (nparams != 10)
+					status = STATUS_EXECUTION_ERROR;
+				if (status == STATUS_SUCCESS)
+				{
+					xargs.fromred = param[3].data.d_int8;
+					xargs.fromgreen = param[4].data.d_int8;
+					xargs.fromblue = param[5].data.d_int8;
+					xargs.tored = param[6].data.d_int8;
+					xargs.togreen = param[7].data.d_int8;
+					xargs.toblue = param[8].data.d_int8;
+					xargs.red_threshold = param[9].data.d_int32;
+					xargs.green_threshold = param[10].data.d_int32;
+					xargs.blue_threshold = param[11].data.d_int32;
+				}
+				break;
 		default:	
 				break;
 	}
-
-	/*  Get the specified drawable  */
-	drawable = gimp_drawable_get(param[2].data.d_drawable);
 	imageID = param[1].data.d_image;
-
 	if (status == STATUS_SUCCESS)
 	{
-		if (gimp_drawable_color(drawable->id))
+		if (gimp_drawable_color(drw->id))
 		{
-			gimp_progress_init("Color exchange...");
-			gimp_tile_cache_ntiles(2 * (drawable->width / gimp_tile_width() + 1));
-			exchange(drawable);
+			gimp_progress_init("Color Exchange...");
+			gimp_tile_cache_ntiles(2 * (drw->width / gimp_tile_width() + 1));
+			exchange();
 			/* store our settings */
 			gimp_set_data("plug_in_exchange", &xargs, sizeof(myParams));
 			/* and flush */
@@ -191,106 +206,15 @@ void	run(char *name, int nparams, GParam *param, int *nreturn_vals, GParam **ret
 			status = STATUS_EXECUTION_ERROR;
 	}
 	values[0].data.d_status = status;
-	gimp_drawable_detach(drawable);
+	gimp_drawable_detach(drw);
 }
 
 /* do the exchanging */
 static
-void	exchange(GDrawable *drawable)
+void	exchange()
 {
-	GPixelRgn	srcPR, destPR;
-	guchar 		*src_row;
-	guchar 		*dest_row;
-	gint    	width, height;
-	gint    	x, y, bpp;
-	gint    	x1, y1, x2, y2;
-
-	/* 
-	 * Get the input area. This is the bounding box of the selection in
-	 * the image (or the entire image if there is no selection). Only
-	 * operating on the input area is simply an optimization. It doesn't
-	 * need to be done for correct operation. (It simply makes it go
-	 * faster, since fewer pixels need to be operated on).
-	 */
-	gimp_drawable_mask_bounds(drawable->id, &x1, &y1, &x2, &y2);
-
-        /* 
-         * Get the size of the input image. (This will/must be the same
-         * as the size of the output image.
-         */
-	width = drawable->width;
-	height = drawable->height;
-	bpp = drawable->bpp;
-
-	/* allocate row buffers */
-	src_row = (guchar *) malloc((x2 - x1) * bpp);
-	dest_row = (guchar *) malloc((x2 - x1) * bpp);
-
-	/* initialize the pixel regions */
-	gimp_pixel_rgn_init(&srcPR, drawable, 0, 0, width, height, FALSE, FALSE);
-	gimp_pixel_rgn_init(&destPR, drawable, 0, 0, width, height, TRUE, TRUE);
-
-	for (y = y1; y < y2; y++)
-	{
-		gimp_pixel_rgn_get_row(&srcPR, src_row, x1, y, (x2 - x1));
-		for (x = x1; x < x2; x++)
-		{
-			guchar	red, green, blue,
-				minred, mingreen, minblue,
-				maxred, maxgreen, maxblue;
-			int	rest, wanted = 0,
-				redx = 0, greenx = 0, bluex = 0;
-
-			/* get boundary values */
-			minred = MAX((int) xargs.fromred - xargs.threshold, 0);
-			mingreen = MAX((int) xargs.fromgreen - xargs.threshold, 0);
-			minblue = MAX((int) xargs.fromblue - xargs.threshold, 0);
-
-			maxred = MIN((int) xargs.fromred + xargs.threshold, 255);
-			maxgreen = MIN((int) xargs.fromgreen + xargs.threshold, 255);
-			maxblue = MIN((int) xargs.fromblue + xargs.threshold, 255);
-			
-			/* get current pixel values */
-			red = src_row[(x-x1) * bpp];
-			green = src_row[(x-x1) * bpp + 1];
-			blue = src_row[(x-x1) * bpp + 2];
-
-			/* 
-			 * check if we want this pixel (does it fall between
-			 * our boundary?)
-			 */
-			if (red >= minred && red <= maxred &&
-			    green >= mingreen && green <= maxgreen &&
-			    blue >= minblue && blue <= maxblue)
-			{
-				redx = red - xargs.fromred;
-				greenx = green - xargs.fromgreen;
-				bluex = blue - xargs.fromblue;
-				wanted = 1;
-			}
-
-			/* exchange if needed */
-			dest_row[(x-x1) * bpp] = wanted ? MAX(MIN(xargs.tored + redx, 255), 0) : src_row[(x-x1) * bpp];
-			dest_row[(x-x1) * bpp + 1] = wanted ? MAX(MIN(xargs.togreen + greenx, 255), 0) : src_row[(x-x1) * bpp + 1];
-			dest_row[(x-x1) * bpp + 2] = wanted ? MAX(MIN(xargs.toblue + bluex, 255), 0) : src_row[(x-x1) * bpp + 2];
-
-			/* copy rest (most likely alpha-channel) */
-			for (rest = 3; rest < bpp; rest++)
-				dest_row[(x-x1) * bpp + rest] = src_row[(x-x1) * bpp + rest];
-		}
-		/* store the dest */
-		gimp_pixel_rgn_set_row(&destPR, dest_row, x1, y, (x2 - x1));
-		/* and tell the user what we're doing */
-		if ((y % 10) == 0)
-			gimp_progress_update((double) y / (double) (y2 - y1));
-	}
-	/* update the processed region */
-	gimp_drawable_flush(drawable);
-	gimp_drawable_merge_shadow(drawable->id, TRUE);
-	gimp_drawable_update(drawable->id, x1, y1, (x2 - x1), (y2 - y1));
-	/* and clean up */
-	free(src_row);
-	free(dest_row);
+	/* do the real exchange */
+	real_exchange(-1, -1, -1, -1, 0);
 }
 
 /* show our dialog */
@@ -304,6 +228,8 @@ int	doDialog()
 	GtkWidget	*mainbox;
 	GtkWidget	*tobox;
 	GtkWidget	*frombox;
+	GtkWidget	*prevbox;
+	guchar 		*color_cube;
 	gchar		**argv;
 	gint		argc;
 	int		framenumber;
@@ -313,7 +239,18 @@ int	doDialog()
 	argv[0] = g_strdup("exchange");
 
 	gtk_init(&argc, &argv);
-	gtk_rc_parse(gimp_gtkrc());
+        gtk_rc_parse(gimp_gtkrc());
+
+	/* stuff for preview */
+	gtk_preview_set_gamma(gimp_gamma());
+	gtk_preview_set_install_cmap(gimp_install_cmap()); 
+	color_cube = gimp_color_cube();
+	gtk_preview_set_color_cube(color_cube[0], color_cube[1], color_cube[2], color_cube[3]); 
+	gtk_widget_set_default_visual(gtk_preview_get_visual());
+    gtk_widget_set_default_colormap(gtk_preview_get_cmap());
+	
+	/* load pixelregion */
+	gimp_pixel_rgn_init(&origregion, drw, 0, 0, PREVIEW_SIZE, PREVIEW_SIZE, FALSE, FALSE);
 
 	/* set up the dialog */
 	dialog = gtk_dialog_new();
@@ -336,9 +273,9 @@ int	doDialog()
 	
 	button = gtk_button_new_with_label("Cancel");
 	GTK_WIDGET_SET_FLAGS(button, GTK_CAN_DEFAULT);
-	gtk_signal_connect_object (GTK_OBJECT(button), "clicked",
-				   (GtkSignalFunc) gtk_widget_destroy,
-				   GTK_OBJECT(dialog));
+	gtk_signal_connect_object(GTK_OBJECT(button), "clicked",
+			   (GtkSignalFunc) gtk_widget_destroy,
+			   GTK_OBJECT(dialog));
 	gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->action_area),
 	                   button, TRUE, TRUE, 0);
 	gtk_widget_show(button); 
@@ -347,34 +284,66 @@ int	doDialog()
 	mainbox = gtk_vbox_new(FALSE, 5);
 	gtk_container_border_width(GTK_CONTAINER(mainbox), 10);
 	gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), mainbox, TRUE, TRUE, 0);
+
+	prevbox = gtk_hbox_new(FALSE, 5);
+	gtk_container_border_width(GTK_CONTAINER(prevbox), 0);
+	gtk_box_pack_start(GTK_BOX(mainbox), prevbox, TRUE, TRUE, 0);
+
 	frombox = gtk_hbox_new(FALSE, 5);
-	gtk_container_border_width(GTK_CONTAINER(frombox), 10);
+	gtk_container_border_width(GTK_CONTAINER(frombox), 0);
 	gtk_box_pack_start(GTK_BOX(mainbox), frombox, TRUE, TRUE, 0);
+
 	tobox = gtk_hbox_new(FALSE, 5);
-	gtk_container_border_width(GTK_CONTAINER(tobox), 10);
+	gtk_container_border_width(GTK_CONTAINER(tobox), 0);
 	gtk_box_pack_start(GTK_BOX(mainbox), tobox, TRUE, TRUE, 0);
 
+	frame = gtk_frame_new("Preview");
+	gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_ETCHED_IN);
+	gtk_container_border_width(GTK_CONTAINER(frame), 0);
+	gtk_box_pack_start(GTK_BOX(prevbox), frame, TRUE, TRUE, 0);
+	gtk_widget_show(frame);
+
+	preview = gtk_preview_new(GTK_PREVIEW_COLOR);
+	gtk_preview_size(GTK_PREVIEW(preview), prev_width, prev_height);
+	gtk_container_add(GTK_CONTAINER(frame), preview);
+	update_preview();
+	gtk_widget_show(preview); 
+
 	/* and our scales */
 	for (framenumber = 0; framenumber < 2; framenumber++)
 	{
 		frame = gtk_frame_new(framenumber ? "To color" : "From color");
 		gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_ETCHED_IN);
-		gtk_container_border_width(GTK_CONTAINER(frame), 10);
+		gtk_container_border_width(GTK_CONTAINER(frame), 0);
 		gtk_box_pack_start(framenumber ? GTK_BOX(tobox) : GTK_BOX(frombox),
 		                   frame, TRUE, TRUE, 0);
 		gtk_widget_show(frame);
 		table = gtk_table_new(8, 2, FALSE);
-		gtk_container_border_width(GTK_CONTAINER(table), 10);
+		gtk_container_border_width(GTK_CONTAINER(table), 0);
 		gtk_container_add(GTK_CONTAINER(frame), table);
 		doLabelAndScale("Red", table, framenumber ? &xargs.tored : &xargs.fromred);
+		if (! framenumber)
+			doLabelAndScale("Red threshold", table, &xargs.red_threshold);
 		doLabelAndScale("Green", table, framenumber ? &xargs.togreen : &xargs.fromgreen);
+		if (! framenumber)
+			doLabelAndScale("Green threshold", table, &xargs.green_threshold);
 		doLabelAndScale("Blue", table, framenumber ? &xargs.toblue : &xargs.fromblue);
-		if (!framenumber)
-			doLabelAndScale("Threshold", table, &xargs.threshold);
+		if (! framenumber)
+			doLabelAndScale("Blue threshold", table, &xargs.blue_threshold);
+		if (! framenumber)
+		{
+			GtkWidget	*button;
+			
+			button = gtk_check_button_new_with_label("Lock thresholds");
+			gtk_table_attach(GTK_TABLE(table), button, 1, 2, 6, 7, GTK_FILL, 0, 0, 0);
+			gtk_signal_connect(GTK_OBJECT(button), "clicked", (GtkSignalFunc) lock_callback, dialog);
+			gtk_widget_show(button);
+		}
 		gtk_widget_show(table);
 	}
 
 	/* show everything */
+	gtk_widget_show(prevbox);
 	gtk_widget_show(tobox);
 	gtk_widget_show(frombox);
 	gtk_widget_show(mainbox);
@@ -395,7 +364,7 @@ void	doLabelAndScale(char *labelname, GtkWidget *table, guchar *dest)
 	idx++;
 	label = gtk_label_new(labelname);
 	gtk_misc_set_alignment(GTK_MISC(label), 0.0, 0.5);
-	gtk_table_attach(GTK_TABLE(table), label, 0, 1, idx, idx + 1, GTK_FILL, 0, 5, 0);
+	gtk_table_attach(GTK_TABLE(table), label, 0, 1, idx, idx + 1, GTK_FILL, 0, 0, 0);
 	scale_data = gtk_adjustment_new(*dest, 0.0, 255.0, 0.0, 0.0, 0.0);
 	scale = gtk_hscale_new(GTK_ADJUSTMENT(scale_data));
 	gtk_widget_set_usize(scale, SCALE_WIDTH, 0);
@@ -403,7 +372,7 @@ void	doLabelAndScale(char *labelname, GtkWidget *table, guchar *dest)
 	gtk_scale_set_digits(GTK_SCALE(scale), 0);
 	gtk_table_attach(GTK_TABLE(table), scale, 1, 2, idx, idx + 1, GTK_FILL, 0, 0, 0);
 	gtk_scale_set_value_pos(GTK_SCALE(scale), GTK_POS_TOP);
-	gtk_range_set_update_policy(GTK_RANGE(scale), GTK_UPDATE_DELAYED);
+	gtk_range_set_update_policy(GTK_RANGE(scale), GTK_UPDATE_DISCONTINUOUS);
 	gtk_signal_connect(GTK_OBJECT(scale_data), "value_changed",
 			   (GtkSignalFunc) scale_callback,
 			   dest);
@@ -418,10 +387,134 @@ void	ok_callback(GtkWidget *widget, gpointer data)
 	gtk_widget_destroy(GTK_WIDGET(data));
 }
 
+static
+void	lock_callback(GtkWidget *widget, gpointer data)
+{
+	lock_thres = 1 - lock_thres;
+}
+
 static
 void	scale_callback(GtkAdjustment *adj, gpointer data)
 {