diff --git a/plugins/ImageReader/ConfigUI.qml b/plugins/ImageReader/ConfigUI.qml
index d2caec0220..d829f46459 100644
--- a/plugins/ImageReader/ConfigUI.qml
+++ b/plugins/ImageReader/ConfigUI.qml
@@ -43,7 +43,7 @@ UM.Dialog
                 TextField {
                     id: peak_height
                     objectName: "Peak_Height"
-                    validator: DoubleValidator {notation: DoubleValidator.StandardNotation; bottom: -500; top: 500;}
+                    validator: RegExpValidator {regExp: /^-?\d{1,3}([\,|\.]\d*)?$/}
                     width: 180 * screenScaleFactor
                     onTextChanged: { manager.onPeakHeightChanged(text) }
                 }
@@ -66,7 +66,7 @@ UM.Dialog
                 TextField {
                     id: base_height
                     objectName: "Base_Height"
-                    validator: DoubleValidator {notation: DoubleValidator.StandardNotation; bottom: 0; top: 500;}
+                    validator: RegExpValidator {regExp: /^\d{1,3}([\,|\.]\d*)?$/}
                     width: 180 * screenScaleFactor
                     onTextChanged: { manager.onBaseHeightChanged(text) }
                 }
@@ -90,7 +90,7 @@ UM.Dialog
                     id: width
                     objectName: "Width"
                     focus: true
-                    validator: DoubleValidator {notation: DoubleValidator.StandardNotation; bottom: 1; top: 500;}
+                    validator: RegExpValidator {regExp: /^[1-9]\d{0,2}([\,|\.]\d*)?$/}
                     width: 180 * screenScaleFactor
                     onTextChanged: { manager.onWidthChanged(text) }
                 }
@@ -113,7 +113,7 @@ UM.Dialog
                     id: depth
                     objectName: "Depth"
                     focus: true
-                    validator: DoubleValidator {notation: DoubleValidator.StandardNotation; bottom: 1; top: 500;}
+                    validator: RegExpValidator {regExp: /^[1-9]\d{0,2}([\,|\.]\d*)?$/}
                     width: 180 * screenScaleFactor
                     onTextChanged: { manager.onDepthChanged(text) }
                 }
diff --git a/plugins/ImageReader/ImageReaderUI.py b/plugins/ImageReader/ImageReaderUI.py
index 40ea15f7a0..a7909f131b 100644
--- a/plugins/ImageReader/ImageReaderUI.py
+++ b/plugins/ImageReader/ImageReaderUI.py
@@ -107,7 +107,7 @@ class ImageReaderUI(QObject):
     def onWidthChanged(self, value):
         if self._ui_view and not self._disable_size_callbacks:
             if len(value) > 0:
-                self._width = float(value)
+                self._width = float(value.replace(",", "."))
             else:
                 self._width = 0
 
@@ -120,7 +120,7 @@ class ImageReaderUI(QObject):
     def onDepthChanged(self, value):
         if self._ui_view and not self._disable_size_callbacks:
             if len(value) > 0:
-                self._depth = float(value)
+                self._depth = float(value.replace(",", "."))
             else:
                 self._depth = 0
 
@@ -132,14 +132,14 @@ class ImageReaderUI(QObject):
     @pyqtSlot(str)
     def onBaseHeightChanged(self, value):
         if (len(value) > 0):
-            self.base_height = float(value)
+            self.base_height = float(value.replace(",", "."))
         else:
             self.base_height = 0
 
     @pyqtSlot(str)
     def onPeakHeightChanged(self, value):
         if (len(value) > 0):
-            self.peak_height = float(value)
+            self.peak_height = float(value.replace(",", "."))
         else:
             self.peak_height = 0
 
@@ -149,7 +149,4 @@ class ImageReaderUI(QObject):
 
     @pyqtSlot(int)
     def onImageColorInvertChanged(self, value):
-        if (value == 1):
-            self.image_color_invert = True
-        else:
-            self.image_color_invert = False
+        self.image_color_invert = (value == 1)