Index: trunk/psLib/src/fits/psFitsHeader.c
===================================================================
--- trunk/psLib/src/fits/psFitsHeader.c	(revision 22727)
+++ trunk/psLib/src/fits/psFitsHeader.c	(revision 22729)
@@ -149,5 +149,5 @@
 
 
-bool psFitsCheckSingleCompressedImagePHU(const psFits *fits, psMetadata *header)
+bool psFitsCheckCompressedImagePHU(const psFits *fits, psMetadata *header)
 {
     PS_ASSERT_FITS_NON_NULL(fits, false);
@@ -163,6 +163,6 @@
     }
 
-    if (psFitsGetSize(fits) != 2) {
-        // No second extension, or multiple extensions
+    if (psFitsGetSize(fits) == 1) {
+        // No extension present
         return false;
     }
@@ -416,5 +416,5 @@
     // Explore the potential case that this is an empty PHU, and the first extension contains the sole image,
     // which is compressed.
-    if (psFitsCheckSingleCompressedImagePHU(fits, header)) {
+    if (psFitsCheckCompressedImagePHU(fits, header)) {
         // This is really what we want, not the empty PHU
         psTrace("psLib.fits", 1,
Index: trunk/psLib/src/fits/psFitsHeader.h
===================================================================
--- trunk/psLib/src/fits/psFitsHeader.h	(revision 22727)
+++ trunk/psLib/src/fits/psFitsHeader.h	(revision 22729)
@@ -20,5 +20,5 @@
 
 
-/// Determine whether the current HDU is an empty PHU with a single compressed image following.
+/// Determine whether the current HDU is an empty PHU with a compressed image following.
 ///
 /// In that case, what should be treated as an image PHU is technically an empty PHU with a binary table
@@ -26,6 +26,6 @@
 /// following compressed image to determine if this is the case.  If so, the FITS file pointer is left
 /// pointing at the compressed image.
-bool psFitsCheckSingleCompressedImagePHU(const psFits *fits, ///< FITS file pointer
-                                         const psMetadata *header ///< Header, or NULL
+bool psFitsCheckCompressedImagePHU(const psFits *fits, ///< FITS file pointer
+                                   const psMetadata *header ///< Header, or NULL
     );
 
Index: trunk/psLib/src/fits/psFitsImage.c
===================================================================
--- trunk/psLib/src/fits/psFitsImage.c	(revision 22727)
+++ trunk/psLib/src/fits/psFitsImage.c	(revision 22729)
@@ -219,5 +219,5 @@
     PS_ASSERT_FITS_NON_NULL(fits, NULL);
 
-    if (psFitsCheckSingleCompressedImagePHU(fits, NULL)) {
+    if (psFitsCheckCompressedImagePHU(fits, NULL)) {
         // This is really what we want, not the empty PHU
         psTrace("psLib.fits", 1,
@@ -432,5 +432,5 @@
     PS_ASSERT_INT_NONNEGATIVE(z, NULL);
 
-    if (psFitsCheckSingleCompressedImagePHU(fits, NULL)) {
+    if (psFitsCheckCompressedImagePHU(fits, NULL)) {
         // This is really what we want, not the empty PHU
         psTrace("psLib.fits", 1,
@@ -479,5 +479,5 @@
     }
 
-    if (psFitsCheckSingleCompressedImagePHU(fits, NULL)) {
+    if (psFitsCheckCompressedImagePHU(fits, NULL)) {
         // This is really what we want, not the empty PHU
         psTrace("psLib.fits", 1,
@@ -873,5 +873,5 @@
     // code replication, and should be sufficient for our needs.
 
-    if (psFitsCheckSingleCompressedImagePHU(fits, NULL)) {
+    if (psFitsCheckCompressedImagePHU(fits, NULL)) {
         // This is really what we want, not the empty PHU
         psTrace("psLib.fits", 1,