[magick-users] What's the command line equal blur of ResizeImage in C API

[Jiang Miao]

According C API ResizeImage
http://www.imagemagick.org/api/resize.php
There is a parameter blur,(the blur factor where > 1 is blurry, < 1 is
sharp. Typically set this to 1.0.)
how can I do that through command line 'convert' ?
if use sharpen or blur, when the value of blur of ResizeImage is 0.8,
what's the value should be set on -sharpen?

Thanks
Miao