iPhone UIBarButtonItem alpha of button image -

i've added button lower toolbar this:

uiimage *locationimage = [uiimage imagenamed:@"193-location-arrow.png"]; uibarbuttonitem *locationbutton = [[uibarbuttonitem alloc] initwithimage:locationimage style:uibarbuttonitemstylebordered target:self action:@selector(updatecurrentlocation)];  nsarray *items = [[nsarray alloc] initwithobjects:locationbutton,nil]; [toolbar setitems:items]; [items release]; [locationbutton release]; 

this works great, alpha of image picked fine, button displays this:

so, took code , modified create button in navigation bar:

uiimage *favouriteimage = [uiimage imagenamed:@"28-star.png"];  uibarbuttonitem *favouritebutton = [[uibarbuttonitem alloc] initwithimage:favouriteimage style:uibarbuttonitemstylebordered target:self action:nil];  self.navigationitem.rightbarbuttonitem = favouritebutton;  [favouritebutton release]; 

the alpha doesn't seem picked on 1 - looks greyed out:

is there need set when using custom images in navigation bar?

thanks , regards,

rich

you convert image white few lines of code:

cgrect imagerect = cgrectmake(0, 0, inimage.size.width, inimage.size.height) cgcolorspaceref colorspace = cgcolorspacecreatedevicergb();  cgcontextref context = cgbitmapcontextcreate(data1, imagerect.size.width, imagerect.size.height, 8, imagerect.size.width * 4, colorspace, kcgimagealphapremultipliedlast); cgcontextcliptomask(context, imagerect, inimage.cgimage); cgcontextsetrgbfillcolor(context1, 1, 1, 1, 1); cgcontextfillrect(context, imagerect);  cgimageref finalimage = cgbitmapcontextcreateimage(context); uiimage *returnimage = [uiimage imagewithcgimage:finalimage];         cgcontextrelease(context); cgcolorspacerelease(colorspace); cgimagerelease(finalimage);