diff --git a/aperisolve/analyzers/color_remapping.py b/aperisolve/analyzers/color_remapping.py
index 365d438..8b1d759 100644
--- a/aperisolve/analyzers/color_remapping.py
+++ b/aperisolve/analyzers/color_remapping.py
@@ -65,8 +65,8 @@ class ColorRemappingAnalyzer(SubprocessAnalyzer):
             img = img.convert("RGB")
             converted = True
 
-        img_np = np.array(img)
-        img_np, _ = self._normalize_image(img_np)
+        img_np_tmp = np.array(img)
+        img_np, _ = self._normalize_image(img_np_tmp)
 
         image_json = []