https://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=30462

diff --git a/coders/caption.c b/coders/caption.c
index ceedbf26ba069cba9d07e20c14bba8c410d03a00..a66bbd7e7dceb5f5755040db840b0983c1201ba2 100644 (file)
--- a/coders/caption.c
+++ b/coders/caption.c
@@ -264,7 +264,7 @@ static Image *ReadCAPTIONImage(const ImageInfo *image_info,
           else
             high=draw_info->pointsize-0.5;
       }
-      draw_info->pointsize=(low+high)/2.0-0.5;
+      draw_info->pointsize=floor((low+high)/2.0-0.5);
     }
   /*
     Draw caption.