diff --git a/.gitignore b/.gitignore
index 742af0463..1da8c99f9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -31,8 +31,9 @@ env3
 venv
 venv3
 
-# temporary test data
+# test data
 
 **/test_data/*
 .helpers/dock_test_data/*
 .helpers/dock_test_add/*
+tests/images
diff --git a/eitprocessing/datahandling/eitdata.py b/eitprocessing/datahandling/eitdata.py
index 916e8ac2b..be0eee4ff 100644
--- a/eitprocessing/datahandling/eitdata.py
+++ b/eitprocessing/datahandling/eitdata.py
@@ -7,6 +7,7 @@
 
 import numpy as np
 from strenum import LowercaseStrEnum
+from tifffile import imwrite
 from typing_extensions import Self
 
 from eitprocessing.datahandling.mixins.equality import Equivalence
@@ -117,6 +118,21 @@ def _sliced_copy(
     def __len__(self):
         return self.pixel_impedance.shape[0]
 
+    def export_pixel_data(
+        self,
+        fname: str | Path,
+    ) -> None:
+        """Save pixel impedance data as 3D tiff stack.
+
+        Args:
+            fname: Output file name.
+        """
+        # TODO: add metadata (at the very least time)
+        # TODO: add standardization for output paths
+        # TODO: allow different file formats??
+        # output_path = Path((self.path[0]).parent() / fname) if isinstance(fname, str) else fname #noqa: ERA001
+        imwrite(fname, self.pixel_impedance)
+
     @property
     def global_baseline(self) -> np.ndarray:
         """Return the global baseline, i.e. the minimum pixel impedance across all pixels."""