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+.. currentmodule:: slideflow.slide.qc
+
+.. _qc:
+
+slideflow.slide.qc
+==================
+
+This module contains functions for slide-level quality control, including Otsu's thresholding and Gaussian blur filtering. Quality control methods are used by passing a list of callables to the ``qc`` argument of ``.extract_tiles()``. They can also be directly applied to a slide with :meth:`slideflow.WSI.qc`.
+
+.. code-block:: python
+
+  import slideflow as sf
+  from slideflow.slide import qc
+
+  # Define custom QC options
+  qc = [
+    qc.Otsu(),
+    qc.Gaussian(sigma=2)
+  ]
+
+  # Use this QC during tile extraction
+  P.extract_tiles(qc=qc)
+
+  # Alternatively, you can use the same QC directly on a WSI object
+  wsi = sf.WSI(...)
+  wsi.qc(qc).show()
+
+.. autoclass:: Otsu
+
+.. autoclass:: Gaussian
+
+.. autoclass:: Save
+
+.. autoclass:: Load
+
+.. autoclass:: StridedDL
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