diff --git a/scikits/image/io/_plugins/q_color_mixer.py b/scikits/image/io/_plugins/q_color_mixer.py
index 95cb74b7..4c37cc4f 100644
--- a/scikits/image/io/_plugins/q_color_mixer.py
+++ b/scikits/image/io/_plugins/q_color_mixer.py
@@ -36,7 +36,7 @@ class IntelligentSlider(QWidget):
         self.name_label.setAlignment(QtCore.Qt.AlignCenter)
 
         self.value_label = QLabel()
-        self.value_label.setText(str(self.slider.value() * self.a + self.b))
+        self.value_label.setText('%2.2f' % (self.slider.value() * self.a + self.b))
         self.value_label.setAlignment(QtCore.Qt.AlignCenter)
 
         self.layout = QGridLayout(self)
@@ -59,7 +59,7 @@ class IntelligentSlider(QWidget):
     def set_value(self, val):
         self.manually_triggered = True
         self.slider.setValue(int((val - self.b) / self.a))
-        self.value_label.setText(str(val)[:4])
+        self.value_label.setText('%2.2f' % val)
         self.manually_triggered = False
 
     def val(self):