Merge pull request #6567 from radarhere/palette

python-pillow · Sep 24, 2022 · b7353af · b7353af
2 parents 3a30a87 + 2a7e603
commit b7353af
Showing 1 changed file with 16 additions and 7 deletions.
diff --git a/src/PIL/ImagePalette.py b/src/PIL/ImagePalette.py
@@ -50,15 +50,24 @@ def palette(self):
 
     @palette.setter
     def palette(self, palette):
+        self._colors = None
         self._palette = palette
 
-        mode_len = len(self.mode)
-        self.colors = {}
-        for i in range(0, len(self.palette), mode_len):
-            color = tuple(self.palette[i : i + mode_len])
-            if color in self.colors:
-                continue
-            self.colors[color] = i // mode_len
+    @property
+    def colors(self):
+        if self._colors is None:
+            mode_len = len(self.mode)
+            self._colors = {}
+            for i in range(0, len(self.palette), mode_len):
+                color = tuple(self.palette[i : i + mode_len])
+                if color in self._colors:
+                    continue
+                self._colors[color] = i // mode_len
+        return self._colors
+
+    @colors.setter
+    def colors(self, colors):
+        self._colors = colors
 
     def copy(self):
         new = ImagePalette()