Index: branches/pap/psLib/src/imageops/psImageCovariance.h
===================================================================
--- branches/pap/psLib/src/imageops/psImageCovariance.h	(revision 27708)
+++ branches/pap/psLib/src/imageops/psImageCovariance.h	(revision 27732)
@@ -90,4 +90,13 @@
     );
 
+
+/// Rescale a covariance matrix following a change in plate scale
+///
+/// The covariance matrix is stretched or shrunk to match the new plate scale.
+psKernel *psImageCovarianceScale(
+    const psKernel *in,                 ///< Input covariance pseudo-matrix
+    float scale                         ///< Scale factor (output plate scale relative to input plate scale)
+    );
+
 /// Control threading for image covariance functions
 ///