iphone - Remove white background in UIImageView -


i using uibezierpath draw lines in white background , black stroke using fingers , touch end method cropping image using cggraphicscontext() , working fine. remove white background , make transparent. have tried several codes , not working me. below code makes entire image transparent. 1 can me make image transparent except black stroke. in advance. sorry if question asked.

-(uiimage*) maketransparent : (uiimage*) viewimage {     cgimageref rawimageref = viewimage.cgimage;     const float colormasking[6] = {255, 255, 255, 255, 255, 255};     uigraphicsbeginimagecontext(viewimage.size);     cgimageref maskedimageref = cgimagecreatewithmaskingcolors(rawimageref, colormasking);     cgcontexttranslatectm(uigraphicsgetcurrentcontext(), 0.0, viewimage.size.height);     cgcontextscalectm(uigraphicsgetcurrentcontext(), 1.0, -1.0);      cgcontextdrawimage(uigraphicsgetcurrentcontext(), cgrectmake(0, 0, viewimage.size.width, viewimage.size.height), maskedimageref);     uiimage *newimage = uigraphicsgetimagefromcurrentimagecontext();     cgimagerelease(maskedimageref);     uigraphicsendimagecontext();     return newimage; }

you use uiimageview display uiimage set backgroundcolor clearcolor bellow...

        [yourimageview setbackgroundcolor:[uicolor clearcolor]];

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