diff --git a/app/tools/gimpposterizetool.c b/app/tools/gimpposterizetool.c
index 4f91a33f8b..ed8f2a99b7 100644
--- a/app/tools/gimpposterizetool.c
+++ b/app/tools/gimpposterizetool.c
@@ -20,21 +20,15 @@
 #include <gegl.h>
 #include <gtk/gtk.h>
 
-#include "libgimpmath/gimpmath.h"
-#include "libgimpconfig/gimpconfig.h"
 #include "libgimpwidgets/gimpwidgets.h"
 
 #include "tools-types.h"
 
 #include "operations/gimpposterizeconfig.h"
 
-#include "core/gimpdrawable.h"
-#include "core/gimperror.h"
-#include "core/gimpimage.h"
-
 #include "widgets/gimphelp-ids.h"
-
-#include "display/gimpdisplay.h"
+#include "widgets/gimppropwidgets.h"
+#include "widgets/gimpspinscale.h"
 
 #include "gimpimagemapoptions.h"
 #include "gimpposterizetool.h"
@@ -42,24 +36,10 @@
 #include "gimp-intl.h"
 
 
-#define SLIDER_WIDTH 200
-
-
-static gboolean   gimp_posterize_tool_initialize     (GimpTool          *tool,
-                                                      GimpDisplay       *display,
-                                                      GError           **error);
-
-static GeglNode * gimp_posterize_tool_get_operation  (GimpImageMapTool  *im_tool,
-                                                      GObject          **config,
-                                                      gchar            **undo_desc);
-static void       gimp_posterize_tool_dialog         (GimpImageMapTool  *im_tool);
-
-static void       gimp_posterize_tool_config_notify  (GObject           *object,
-                                                      GParamSpec        *pspec,
-                                                      GimpPosterizeTool *posterize_tool);
-
-static void       gimp_posterize_tool_levels_changed (GtkAdjustment     *adjustment,
-                                                      GimpPosterizeTool *posterize_tool);
+static GeglNode * gimp_posterize_tool_get_operation (GimpImageMapTool  *im_tool,
+                                                     GObject          **config,
+                                                     gchar            **undo_desc);
+static void       gimp_posterize_tool_dialog        (GimpImageMapTool  *im_tool);
 
 
 G_DEFINE_TYPE (GimpPosterizeTool, gimp_posterize_tool,
@@ -87,11 +67,8 @@ gimp_posterize_tool_register (GimpToolRegisterCallback  callback,
 static void
 gimp_posterize_tool_class_init (GimpPosterizeToolClass *klass)
 {
-  GimpToolClass         *tool_class    = GIMP_TOOL_CLASS (klass);
   GimpImageMapToolClass *im_tool_class = GIMP_IMAGE_MAP_TOOL_CLASS (klass);
 
-  tool_class->initialize       = gimp_posterize_tool_initialize;
-
   im_tool_class->dialog_desc   = _("Posterize (Reduce Number of Colors)");
 
   im_tool_class->get_operation = gimp_posterize_tool_get_operation;
@@ -103,42 +80,16 @@ gimp_posterize_tool_init (GimpPosterizeTool *posterize_tool)
 {
 }
 
-static gboolean
-gimp_posterize_tool_initialize (GimpTool     *tool,
-                                GimpDisplay  *display,
-                                GError      **error)
-{
-  GimpPosterizeTool *posterize_tool = GIMP_POSTERIZE_TOOL (tool);
-
-  if (! GIMP_TOOL_CLASS (parent_class)->initialize (tool, display, error))
-    {
-      return FALSE;
-    }
-
-  gtk_adjustment_set_value (posterize_tool->levels_data,
-                            posterize_tool->config->levels);
-
-  return TRUE;
-}
-
 static GeglNode *
 gimp_posterize_tool_get_operation (GimpImageMapTool  *image_map_tool,
                                    GObject          **config,
                                    gchar            **undo_desc)
 {
-  GimpPosterizeTool *posterize_tool = GIMP_POSTERIZE_TOOL (image_map_tool);
-
-  posterize_tool->config = g_object_new (GIMP_TYPE_POSTERIZE_CONFIG, NULL);
-
-  g_signal_connect_object (posterize_tool->config, "notify",
-                           G_CALLBACK (gimp_posterize_tool_config_notify),
-                           G_OBJECT (posterize_tool), 0);
-
-  *config = G_OBJECT (posterize_tool->config);
+  *config = g_object_new (GIMP_TYPE_POSTERIZE_CONFIG, NULL);
 
   return gegl_node_new_child (NULL,
                               "operation", "gimp:posterize",
-                              "config",    posterize_tool->config,
+                              "config",    *config,
                               NULL);
 }
 
@@ -150,58 +101,15 @@ gimp_posterize_tool_get_operation (GimpImageMapTool  *image_map_tool,
 static void
 gimp_posterize_tool_dialog (GimpImageMapTool *image_map_tool)
 {
-  GimpPosterizeTool *posterize_tool = GIMP_POSTERIZE_TOOL (image_map_tool);
-  GtkWidget         *main_vbox;
-  GtkWidget         *table;
-  GtkObject         *data;
+  GtkWidget *main_vbox;
+  GtkWidget *scale;
 
   main_vbox = gimp_image_map_tool_dialog_get_vbox (image_map_tool);
 
-  /*  The table containing sliders  */
-  table = gtk_table_new (1, 3, FALSE);
-  gtk_table_set_col_spacings (GTK_TABLE (table), 4);
-  gtk_box_pack_start (GTK_BOX (main_vbox), table, FALSE, FALSE, 0);
-  gtk_widget_show (table);
-
-  data = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
-                               _("Posterize _levels:"), SLIDER_WIDTH, -1,
-                               posterize_tool->config->levels,
-                               2.0, 256.0, 1.0, 10.0, 0,
-                               TRUE, 0.0, 0.0,
-                               NULL, NULL);
-
-  gimp_scale_entry_set_logarithmic (data, TRUE);
-
-  posterize_tool->levels_data = GTK_ADJUSTMENT (data);
-
-  g_signal_connect (posterize_tool->levels_data, "value-changed",
-                    G_CALLBACK (gimp_posterize_tool_levels_changed),
-                    posterize_tool);
-}
-
-static void
-gimp_posterize_tool_config_notify (GObject           *object,
-                                   GParamSpec        *pspec,
-                                   GimpPosterizeTool *posterize_tool)
-{
-  GimpPosterizeConfig *config = GIMP_POSTERIZE_CONFIG (object);
-
-  if (! posterize_tool->levels_data)
-    return;
-
-  gtk_adjustment_set_value (posterize_tool->levels_data, config->levels);
-}
-
-static void
-gimp_posterize_tool_levels_changed (GtkAdjustment     *adjustment,
-                                    GimpPosterizeTool *posterize_tool)
-{
-  gint value = ROUND (gtk_adjustment_get_value (adjustment));
-
-  if (posterize_tool->config->levels != value)
-    {
-      g_object_set (posterize_tool->config,
-                    "levels", value,
-                    NULL);
-    }
+  scale = gimp_prop_spin_scale_new (image_map_tool->config, "levels",
+                                    _("Posterize _levels"),
+                                    1.0, 10.0, 0);
+  gimp_spin_scale_set_gamma (GIMP_SPIN_SCALE (scale), 1.5);
+  gtk_box_pack_start (GTK_BOX (main_vbox), scale, FALSE, FALSE, 0);
+  gtk_widget_show (scale);
 }
diff --git a/app/tools/gimpposterizetool.h b/app/tools/gimpposterizetool.h
index e2f747b975..ac804a6a31 100644
--- a/app/tools/gimpposterizetool.h
+++ b/app/tools/gimpposterizetool.h
@@ -35,12 +35,7 @@ typedef struct _GimpPosterizeToolClass GimpPosterizeToolClass;
 
 struct _GimpPosterizeTool
 {
-  GimpImageMapTool     parent_instance;
-
-  GimpPosterizeConfig *config;
-
-  /*  dialog  */
-  GtkAdjustment       *levels_data;
+  GimpImageMapTool  parent_instance;
 };
 
 struct _GimpPosterizeToolClass