diff --git a/scanslicer/controller_detection.py b/scanslicer/controller_detection.py
index 925a795..c8bab9d 100644
--- a/scanslicer/controller_detection.py
+++ b/scanslicer/controller_detection.py
@@ -62,3 +62,10 @@ class AutotuneTask(QRunnable):
         except Exception as exc:
             details = f"{exc}\n\n{traceback.format_exc()}"
             self.signals.failed.emit(details)
+
+
+# rgb_array_to_qimage: function definition for ScanSlicer behavior.
+def rgb_array_to_qimage(image):
+    h, w, c = image.shape
+    bytes_per_line = c * w
+    return QImage(image.data, w, h, bytes_per_line, QImage.Format_RGB888).copy()