diff --git a/scanslicer/controller_image_io.py b/scanslicer/controller_image_io.py
new file mode 100644
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--- /dev/null
+++ b/scanslicer/controller_image_io.py
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+import ntpath
+import os
+
+import cv2
+import numpy as np
+from PySide6.QtWidgets import QFileDialog, QMessageBox
+
+
+# ScanSlicerImageIOMixin: class definition for ScanSlicer behavior.