Index: trunk/psModules/src/imcombine/pmSubtractionKernels.c
===================================================================
--- trunk/psModules/src/imcombine/pmSubtractionKernels.c	(revision 14476)
+++ trunk/psModules/src/imcombine/pmSubtractionKernels.c	(revision 14521)
@@ -4,4 +4,5 @@
 
 #include <stdio.h>
+#include <string.h>
 #include <pslib.h>
 
@@ -628,2 +629,28 @@
     }
 }
+
+
+pmSubtractionKernelsType pmSubtractionKernelsTypeFromString(const char *type)
+{
+    if (strcasecmp(type, "POIS") == 0) {
+        return PM_SUBTRACTION_KERNEL_POIS;
+    }
+    if (strcasecmp(type, "ISIS") == 0) {
+        return PM_SUBTRACTION_KERNEL_ISIS;
+    }
+    if (strcasecmp(type, "SPAM") == 0) {
+        return PM_SUBTRACTION_KERNEL_SPAM;
+    }
+    if (strcasecmp(type, "FRIES") == 0) {
+        return PM_SUBTRACTION_KERNEL_FRIES;
+    }
+    if (strcasecmp(type, "GUNK") == 0) {
+        return PM_SUBTRACTION_KERNEL_GUNK;
+    }
+    if (strcasecmp(type, "RINGS") == 0) {
+        return PM_SUBTRACTION_KERNEL_RINGS;
+    }
+
+    psError(PS_ERR_BAD_PARAMETER_VALUE, true, "Unrecognised kernel type: %s", type);
+    return PM_SUBTRACTION_KERNEL_NONE;
+}