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-rw-r--r--analyzer/pnmpsnr.c2
-rw-r--r--doc/HISTORY3
2 files changed, 4 insertions, 1 deletions
diff --git a/analyzer/pnmpsnr.c b/analyzer/pnmpsnr.c
index 88b2a981..c32f7d64 100644
--- a/analyzer/pnmpsnr.c
+++ b/analyzer/pnmpsnr.c
@@ -126,7 +126,7 @@ reportPsnr(struct pam const pam,
         else
             pm_message("Cr color component does not differ.");
     } else {
-        if (ySumSqDiff == 0)
+        if (ySumSqDiff > 0)
             pm_message("PSNR between %s and %s: %.2f dB",
                        filespec1, filespec2, 10 * log10(yPsnr));
         else
diff --git a/doc/HISTORY b/doc/HISTORY
index a3e872b0..54c62427 100644
--- a/doc/HISTORY
+++ b/doc/HISTORY
@@ -34,6 +34,9 @@ not yet  BJH  Release 10.54.00
               pngtopam: fix bug: -verbose reports history chunk present when
               it's really a palette.
 
+              pnmpsnr: fix bug: says PGM images differ when they don't
+              and vice versa.
+
 10.12.30 BJH  Release 10.53.00
 
               Add pammosaicknit.  Thanks Scott Pakin.