c# - How can i set brightness for camera using IAMVideoProcAmp? -

i'm trying use iamvideoprocamp (directshow.net c#) set brightness microsoft camera (lifecam studio). refer solution here. solution uses iamvideoprocamp set brightness camera. after connect device calling

dsdevice.getdevicesofcat(filtercategory.videoinputdevice);

i set brightness of camera. it's seem not work when call set() function of iamvideoprocamp

int set(           videoprocampproperty property, // videoprocampproperty           int lvalue,          // value set           videoprocampflags flags  // videoprocamp_flags_*         ); 

i tried set various valid values function there no effect on camera. can max/min/default value of brightness property of camera function:

int getrange(             videoprocampproperty property,         // property query             out int pmin,          // range minimum             out int pmax,          // range maxumum             out int psteppingdelta,// step size             out int pdefault,      // default value             out videoprocampflags pcapsflags     // videoprocampflags             ); 

and gave me max = 255, min = 30, default = 133, pcapsflags = manual.

i used microsoft lifecam software adjust brightness , makes effect on camera immediately. max/min value of brightness max = 2.5, min = -2.5 please show me way set brightness of camera , why max/min values different value on property pages?

thank lot.

at last figured out iamvideoprocamp::set not work because microsoft lifecam software. software installed along installing of camera driver. truecolor feature of software point of problem, when turn truecolor on software, cannot use iamvideoprocamp::set adjust brightness app anymore. uninstall microsoft lifecam works desire. hope info same problem me.