(no commit message)

diff --git a/MagickWand/operation.c b/MagickWand/operation.c
index 224cf486d4ed9eeb48fd65dd57862fbd5f2d0798..ce2f250fe4a4155f153c103b8ea7be0a5b2ce015 100644 (file)
--- a/MagickWand/operation.c
+++ b/MagickWand/operation.c
@@ -2535,6 +2535,8 @@ static void CLISimpleOperatorImage(MagickCLI *cli_wand,
           flags=ParseGeometry(arg1,&geometry_info);
           if ((flags & (RhoValue|SigmaValue)) == 0)
             CLIWandExceptArgBreak(OptionError,"InvalidArgument",option,arg1);
+          if ((flags & SigmaValue) == 0)
+            geometry_info.sigma=1.0;
           if ((flags & PercentValue) != 0)
             geometry_info.xi=(double) QuantumRange*geometry_info.xi/100.0;
           new_image=AdaptiveThresholdImage(_image,(size_t) geometry_info.rho,