diff --git a/tools/dumbPaintTool/app/canvaslayer.py b/tools/dumbPaintTool/app/canvaslayer.py
index 9a786561..f0670be0 100644
--- a/tools/dumbPaintTool/app/canvaslayer.py
+++ b/tools/dumbPaintTool/app/canvaslayer.py
@@ -79,6 +79,16 @@ class CanvasLayer():
         self._colors  = [row.copy() for row in cl._colors]
         self.changed.emit()
 
+    def __eq__(self, value: object) -> bool:
+        return (
+            issubclass(type(value),CanvasLayer) and
+            self._pos     == value._pos     and
+            self._size    == value._size    and
+            self._offset  == value._offset  and
+            self._visible == value._visible and
+            all(a==b for a,b in zip(self._data,  value._data)) and
+            all(a==b for a,b in zip(self._colors,value._colors)) )
+
     def update(self):
         self.changed.emit()
 
diff --git a/tools/dumbPaintTool/app/glbls.py b/tools/dumbPaintTool/app/glbls.py
index fad48f2b..da015496 100644
--- a/tools/dumbPaintTool/app/glbls.py
+++ b/tools/dumbPaintTool/app/glbls.py
@@ -55,14 +55,9 @@ class Snapshot():
             cl.restore(clone)
 
     def __eq__(self, value: object) -> bool:
-        if self._layer != value._layer:
-            return False
-        for (a,_),(b,_) in zip(self._canvasLayers,value._canvasLayers):
-            if a!=b:
-                return False
-        return True
-
-
+        return (
+            self._layer == value._layer and
+            all(a==b for a,b in self._canvasLayers))
 
 @dataclass()
 class Glbls:
diff --git a/tools/dumbPaintTool/app/state/layers.py b/tools/dumbPaintTool/app/state/layers.py
index 53f56cf0..0a384ed1 100644
--- a/tools/dumbPaintTool/app/state/layers.py
+++ b/tools/dumbPaintTool/app/state/layers.py
@@ -55,6 +55,9 @@ class Layers():
         self.layersOrderChanged.emit(self._layers)
         self.layerSelected.emit(self._selected)
 
+    def __eq__(self, value: object) -> bool:
+        return self._layers == value._layers
+
     def __len__(self):
         return len(self._layers)