1 files changed, 7 insertions, 0 deletions
diff --git a/converter/other/pnmtopng.c b/converter/other/pnmtopng.c
index 60b8276b..ed852fd0 100644
--- a/converter/other/pnmtopng.c
+++ b/converter/other/pnmtopng.c
@@ -961,6 +961,8 @@ tryTransparentColor(FILE *     const ifp,
             }
         }
     }
+    *singleColorIsTransP = singleColorIsTrans;
+
     pnm_freerow(xelrow);
 }
 
@@ -1468,9 +1470,14 @@ computeUnsortedAlphaPalette(FILE *           const ifP,
     int row;
     xel * xelrow;
     unsigned int alphaColorPairCnt;
+        /* Number of different alpha/color pairs we've seen so far as we
+           iterate through the image.
+        */
 
     cht = ppm_colorhisttocolorhash(chv, colors);
 
+    /* We have not seen any alphas of any color yet. */
+    alphaColorPairCnt = 0;
     for (colorIndex = 0; colorIndex < colors; ++colorIndex) {
         alphasOfColor[colorIndex] = NULL;
         alphasOfColorCnt[colorIndex] = 0;