https://imagemagick.org/discourse-server/viewtopic.php?f=3&t=35082

diff --git a/coders/fits.c b/coders/fits.c
index 40d6a84fbb19e390773100a39956166bba019094..4bc5a8ecd60ffe9d950e8746c799bf87a6529f5a 100644 (file)
--- a/coders/fits.c
+++ b/coders/fits.c
@@ -723,7 +723,7 @@ static MagickBooleanType WriteFITSImage(const ImageInfo *image_info,
   CopyFitsRecord(fits_info,header,offset);
   offset+=80;
   (void) FormatLocaleString(header,FITSBlocksize,"BZERO   =         %E",
-    image->depth > 8 ? GetFITSPixelRange(image->depth)/2.0 : 0.0);
+    image->depth > 8 ? (GetFITSPixelRange(image->depth)+1)/2.0 : 0.0);
   CopyFitsRecord(fits_info,header,offset);
   offset+=80;
   (void) FormatLocaleString(header,FITSBlocksize,"DATAMAX =         %E",