diff --git a/data/widgets/replace_color.xml b/data/widgets/replace_color.xml
index 89f53a451..780b5fd75 100644
--- a/data/widgets/replace_color.xml
+++ b/data/widgets/replace_color.xml
@@ -11,8 +11,8 @@
         </box>
         <box vertical="true" homogeneous="true" expansive="true" name="color_buttons_box" />
       </box>
-      <label text="Fuzziness:" />
-      <slider min="0" max="255" name="fuzziness" />
+      <label text="Tolerance:" />
+      <slider min="0" max="255" name="tolerance" />
     </box>
     <box vertical="true">
       <button text="&amp;OK" name="button_ok" magnetic="true" />
diff --git a/src/commands/fx/cmd_replace_color.cpp b/src/commands/fx/cmd_replace_color.cpp
index 21f6f95df..30048e42a 100644
--- a/src/commands/fx/cmd_replace_color.cpp
+++ b/src/commands/fx/cmd_replace_color.cpp
@@ -42,7 +42,7 @@
 #include "widgets/target.h"
 
 static JWidget button_color1, button_color2;
-static JWidget slider_fuzziness, check_preview;
+static JWidget slider_tolerance, check_preview;
 static JWidget preview;
 
 static bool color_change_hook(JWidget widget, void *data);
@@ -90,7 +90,7 @@ void ReplaceColorCommand::onExecute(Context* context)
   get_widgets(window,
 	      "color_buttons_box", &color_buttons_box,
 	      "preview", &check_preview,
-	      "fuzziness", &slider_fuzziness,
+	      "tolerance", &slider_tolerance,
 	      "target", &box_target,
 	      "button_ok", &button_ok, NULL);
 
@@ -114,8 +114,8 @@ void ReplaceColorCommand::onExecute(Context* context)
   target_button = target_button_new(sprite->getImgType(), false);
   target_button_set_target(target_button, effect.target);
 
-  jslider_set_value(slider_fuzziness,
-		    get_config_int("ReplaceColor", "Fuzziness", 0));
+  jslider_set_value(slider_tolerance,
+		    get_config_int("ReplaceColor", "Tolerance", 0));
   if (get_config_bool("ReplaceColor", "Preview", true))
     check_preview->setSelected(true);
 
@@ -127,7 +127,7 @@ void ReplaceColorCommand::onExecute(Context* context)
   HOOK(button_color1, SIGNAL_COLORBUTTON_CHANGE, color_change_hook, 1);
   HOOK(button_color2, SIGNAL_COLORBUTTON_CHANGE, color_change_hook, 2);
   HOOK(target_button, SIGNAL_TARGET_BUTTON_CHANGE, target_change_hook, 0);
-  HOOK(slider_fuzziness, JI_SIGNAL_SLIDER_CHANGE, slider_change_hook, 0);
+  HOOK(slider_tolerance, JI_SIGNAL_SLIDER_CHANGE, slider_change_hook, 0);
   HOOK(check_preview, JI_SIGNAL_CHECK_CHANGE, preview_change_hook, 0);
 
   /* default position */
@@ -174,7 +174,7 @@ static bool target_change_hook(JWidget widget, void *data)
 
 static bool slider_change_hook(JWidget widget, void *data)
 {
-  set_config_int("ReplaceColor", "Fuzziness", jslider_get_value(widget));
+  set_config_int("ReplaceColor", "Tolerance", jslider_get_value(widget));
   make_preview();
   return false;
 }
@@ -190,15 +190,15 @@ static void make_preview()
 {
   Sprite* sprite = preview_get_effect(preview)->sprite;
   color_t from, to;
-  int fuzziness;
+  int tolerance;
 
   from = get_config_color("ReplaceColor", "Color1", color_mask());
   to = get_config_color("ReplaceColor", "Color2", color_mask());
-  fuzziness = get_config_int("ReplaceColor", "Fuzziness", 0);
+  tolerance = get_config_int("ReplaceColor", "Tolerance", 0);
 
   set_replace_colors(get_color_for_layer(sprite->getCurrentLayer(), from),
 		     get_color_for_layer(sprite->getCurrentLayer(), to),
-		     MID(0, fuzziness, 255));
+		     MID(0, tolerance, 255));
 
   if (check_preview->isSelected())
     preview_restart(preview);
diff --git a/src/effect/replcol.cpp b/src/effect/replcol.cpp
index f6ac008f7..771c9f981 100644
--- a/src/effect/replcol.cpp
+++ b/src/effect/replcol.cpp
@@ -24,14 +24,14 @@
 
 static struct {
   int from, to;
-  int fuzziness;
+  int tolerance;
 } data;
 
-void set_replace_colors(int from, int to, int fuzziness)
+void set_replace_colors(int from, int to, int tolerance)
 {
   data.from = from;
   data.to = to;
-  data.fuzziness = MID(0, fuzziness, 255);
+  data.tolerance = MID(0, tolerance, 255);
 }
 
 void apply_replace_color4(Effect *effect)
@@ -69,10 +69,10 @@ void apply_replace_color4(Effect *effect)
     src_b = _rgba_getb(c);
     src_a = _rgba_geta(c);
 
-    if ((src_r >= dst_r-data.fuzziness) && (src_r <= dst_r+data.fuzziness) &&
-        (src_g >= dst_g-data.fuzziness) && (src_g <= dst_g+data.fuzziness) &&
-        (src_b >= dst_b-data.fuzziness) && (src_b <= dst_b+data.fuzziness) &&
-        (src_a >= dst_a-data.fuzziness) && (src_a <= dst_a+data.fuzziness))
+    if ((ABS(src_r-dst_r) <= data.tolerance) &&
+        (ABS(src_g-dst_g) <= data.tolerance) &&
+        (ABS(src_b-dst_b) <= data.tolerance) &&
+        (ABS(src_a-dst_a) <= data.tolerance))
       *(dst_address++) = data.to;
     else
       *(dst_address++) = c;
@@ -110,8 +110,8 @@ void apply_replace_color2(Effect *effect)
     src_k = _graya_getv(c);
     src_a = _graya_geta(c);
 
-    if ((src_k >= dst_k-data.fuzziness) && (src_k <= dst_k+data.fuzziness) &&
-        (src_a >= dst_a-data.fuzziness) && (src_a <= dst_a+data.fuzziness))
+    if ((ABS(src_k-dst_k) <= data.tolerance) &&
+        (ABS(src_a-dst_a) <= data.tolerance))
       *(dst_address++) = data.to;
     else
       *(dst_address++) = c;
@@ -141,7 +141,7 @@ void apply_replace_color1(Effect *effect)
 
     c = *(src_address++);
 
-    if ((c >= data.from-data.fuzziness) && (c <= data.from+data.fuzziness))
+    if (ABS(c-data.from) <= data.tolerance)
       *(dst_address++) = data.to;
     else
       *(dst_address++) = c;
diff --git a/src/effect/replcol.h b/src/effect/replcol.h
index 1d29f8e80..4bbe60fad 100644
--- a/src/effect/replcol.h
+++ b/src/effect/replcol.h
@@ -21,7 +21,7 @@
 
 struct Effect;
 
-void set_replace_colors(int from, int to, int fuzziness);
+void set_replace_colors(int from, int to, int tolerance);
 
 void apply_replace_color4(struct Effect *effect);
 void apply_replace_color2(struct Effect *effect);