Fix failure to recognize BLACKANDWHITE_ALPHA

git-svn-id: http://svn.code.sf.net/p/netpbm/code/trunk@4103 9d0c8265-081b-0410-96cb-a4ca84ce46f8

1 files changed, 10 insertions, 0 deletions

diff --git a/converter/other/pamtopng.c b/converter/other/pamtopng.c
index 3a987820..a9d04029 100644
--- a/converter/other/pamtopng.c
+++ b/converter/other/pamtopng.c
@@ -287,6 +287,16 @@ colorTypeFromInputType(const struct pam * const pamP) {
             pm_error("Input tuple type is GRAYSCALE, "
                      "but number of planes is %u instead of 1",
                      pamP->depth);
+     } else if (strneq(pamP->tuple_type, "BLACKANDWHITE_ALPHA", 19)) {
+        if (pamP->depth != 2)
+            pm_error("Input tuple type is BLACKANDWHITE_ALPHA, "
+                     "but number of planes is %u instead of 2",
+                     pamP->depth);
+        if (pamP->maxval != 1)
+            pm_error("Input tuple type is BLACKANDWHITE_ALPHA, "
+                     "but maxval is %u instead of 1", (unsigned)pamP->maxval);
+
+        retval = PNG_COLOR_TYPE_GRAY_ALPHA;
     } else if (strneq(pamP->tuple_type, "BLACKANDWHITE", 3)) {
         if (pamP->depth != 1)
             pm_error("Input tuple type is BLACKANDWHITE, "