see -respect-parenthesis 
http://www.imagemagick.org/script/command-line-options.php#respect-parentheses

convert -respect-parenthesis \( rose: -level 70,75% \) \( rose: \) 
-compose Screen -composite rose.jpg


>When I use convert with the -level parameter, it affects everything 
>in the command, even if I separate the other images with "\( \)"
>
>Example:
>convert \( rose: -level 70,75% \) \( rose: \) -compose Screen 
>-composite rose.jpg
>
>When I use the above command, the first and the second "rose" is 
>affected by -level.
>
>But when I do exactly the same thing with any other parameter, like 
>blur, it works ok (affecting only the first "rose:").
>
>Example:
>convert \( rose: -blur 0x5 \) \( rose: \) -compose Screen -composite rose.jpg
>
>The above command works fine.
>
>I'm currently using ImageMagick 6.4.9-3 in linux.
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