How to darker an image without -brightness-contrast option ?

[ziasumo]

Its working fine with -brightness-contrast -value
but on ImageMagick version on my server does not support this -brightness-contrast.
Is there any other command to little dark an image like some shadow on it..?
Is there any solution

[snibgo]

"-level" gives the functionality of brightness/contrast.

Also useful is "-gamma".

[fmw42]

also see -function polynomial, which can processes the equation y=ax+b where a is slope and related to contrast and b is offset and related to brightness