Fix Q32 read of 16-bit grayscale PNGs

diff --git a/coders/png.c b/coders/png.c
index c561e59f2e7d226560ada06e99786063614a6bdd..28b4c590e198955cea1105440b3700e1fe2a2c48 100644 (file)
--- a/coders/png.c
+++ b/coders/png.c
@@ -2810,7 +2810,8 @@ static Image *ReadOnePNGImage(MngInfo *mng_info,
       "  image->colorspace=%d",(int) image->colorspace);
 
   if (((int) ping_color_type == PNG_COLOR_TYPE_PALETTE) ||
-      ((int) ping_color_type == PNG_COLOR_TYPE_GRAY))
+      ((int) ping_bit_depth < 16 &&
+      (int) ping_color_type == PNG_COLOR_TYPE_GRAY))
     {
       size_t
         one;