Index: trunk/psLib/src/imageops/psImageConvolve.h
===================================================================
--- trunk/psLib/src/imageops/psImageConvolve.h	(revision 25383)
+++ trunk/psLib/src/imageops/psImageConvolve.h	(revision 26892)
@@ -138,4 +138,14 @@
 );
 
+/// Truncate a kernel
+///
+/// Truncates the outer parts of the kernel where the contribution is below the nominated fraction of the
+/// total kernel.
+bool psKernelTruncate(
+    psKernel *in,                       ///< Kernel to be truncated
+    float frac                          ///< Fraction for truncation threshold
+    );
+
+
 /// Convolve an image with a kernel, using a direct convolution
 ///