Index: trunk/ppSub/src/ppSubArguments.c
===================================================================
--- trunk/ppSub/src/ppSubArguments.c	(revision 23242)
+++ trunk/ppSub/src/ppSubArguments.c	(revision 23298)
@@ -29,5 +29,5 @@
 {
     fprintf(stderr, "\nPan-STARRS PSF-matched image subtraction\n\n");
-    fprintf(stderr, "Usage: %s INPUT.fits REFERENCE.fits OUTPUT_ROOT \n"
+    fprintf(stderr, "Usage: %s OUTPUT_ROOT \n"
             "\t[-psf REFERENCE.psf.fits]\n\n"
             "This subtracts the convolved REFERENCE from the INPUT, by default.\n",
@@ -202,10 +202,13 @@
 
     psMetadata *arguments = config->arguments; // Command-line arguments
+    psMetadataAddStr(arguments, PS_LIST_TAIL, "-inimage", 0, "Input image", NULL);
     psMetadataAddStr(arguments, PS_LIST_TAIL, "-inmask", 0, "Input mask image", NULL);
     psMetadataAddStr(arguments, PS_LIST_TAIL, "-invariance", 0, "Input variance image", NULL);
     psMetadataAddStr(arguments, PS_LIST_TAIL, "-insources", 0, "Input source list", NULL);
+    psMetadataAddStr(arguments, PS_LIST_TAIL, "-refimage", 0, "Reference image", NULL);
     psMetadataAddStr(arguments, PS_LIST_TAIL, "-refmask", 0, "Reference mask image", NULL);
     psMetadataAddStr(arguments, PS_LIST_TAIL, "-refvariance", 0, "Reference variance image", NULL);
     psMetadataAddStr(arguments, PS_LIST_TAIL, "-refsources", 0, "Reference source list", NULL);
+    psMetadataAddStr(arguments, PS_LIST_TAIL, "-kernel", 0, "Precalculated kernel to apply", NULL);
     psMetadataAddStr(arguments, PS_LIST_TAIL, "-stats", 0, "Statistics file", NULL);
     psMetadataAddF32(arguments, PS_LIST_TAIL, "-region", 0, "Size of iso-kernel region", NAN);
@@ -253,12 +256,15 @@
     psMetadataAddBool(arguments, PS_LIST_TAIL, "-visual", 0, "Show diagnostic plots", NULL);
 
-    if (argc == 1 || !psArgumentParse(arguments, &argc, argv) || argc != 4) {
+    if (argc == 1 || !psArgumentParse(arguments, &argc, argv) || argc != 2) {
         usage(argv[0], arguments, config);
     }
 
-    fileList("INPUT", argv[1], "Name of the input image",     config);
-    fileList("REF",   argv[2], "Name of the reference image", config);
     psMetadataAddStr(config->arguments, PS_LIST_TAIL, "OUTPUT", 0, "Name of the output image", argv[3]);
 
+
+    const char *inImage = psMetadataLookupStr(NULL, arguments, "-inimage"); // Name of input image
+    if (inImage && strlen(inImage) > 0) {
+        fileList("INPUT", inImage, "Name of the input image", config);
+    }
     const char *inMask = psMetadataLookupStr(NULL, arguments, "-inmask"); // Name of input mask
     if (inMask && strlen(inMask) > 0) {
@@ -274,4 +280,8 @@
     }
 
+    const char *refImage = psMetadataLookupStr(NULL, arguments, "-refimage"); // Name of reference image
+    if (refImage && strlen(refImage) > 0) {
+        fileList("INPUT", refImage, "Name of the reference image", config);
+    }
     const char *refMask = psMetadataLookupStr(NULL, arguments, "-refmask"); // Name of reference mask
     if (refMask && strlen(refMask) > 0) {
@@ -285,4 +295,9 @@
     if (refSources && strlen(refSources) > 0) {
         fileList("REF.SOURCES", refSources, "Name of the reference source list", config);
+    }
+
+    const char *kernel = psMetadataLookupStr(NULL, arguments, "-kernel"); // Name of kernel
+    if (kernel && strlen(kernel) > 0) {
+        fileList("KERNEL", kernel, "Name of the kernel to apply", config);
     }