ios - Mysterious memory management issue in Core Graphics -

here method use in category on uiimage resize it. works seems in method (i not 100% sure it's in there) amassing memory. not expert , quite difficult me trace down cgcontext function using instruments.app

http://bytolution.com/instruments_scrnsht.png

- (uiimage *)cropwithsquareratioandresolution:(cgfloat)resolution {     uiimage *sourceimg = (uiimage*)self;     cgsize size = [sourceimg size];     int padding = 0;     int picturesize;     int startcroppingposition;     if (size.height > size.width) {         picturesize = size.width - (2.0 * padding);         startcroppingposition = (size.height - picturesize) / 2.0;     } else {         picturesize = size.height - (2.0 * padding);         startcroppingposition = (size.width - picturesize) / 2.0;     }     if (resolution == 0) resolution = sourceimg.size.width;     cgrect croprect = cgrectmake(startcroppingposition, padding, picturesize, picturesize);         cgrect newrect = cgrectintegral(cgrectmake(0, 0,resolution, resolution));     cgimageref imageref = cgimagecreatewithimageinrect([sourceimg cgimage], croprect);      // build context that's same dimensions new size     cgcontextref bitmap = cgbitmapcontextcreate(null,                                             newrect.size.width,                                             newrect.size.height,                                             cgimagegetbitspercomponent(imageref),                                             0,                                             cgimagegetcolorspace(imageref),                                             cgimagegetbitmapinfo(imageref));      cgcontextsetinterpolationquality(bitmap, kcginterpolationhigh);     cgcontextdrawimage(bitmap, newrect, imageref);     cgimageref newimageref = cgbitmapcontextcreateimage(bitmap);     uiimage *newimage = [uiimage imagewithcgimage:newimageref scale:1.0 orientation:self.imageorientation];      // clean     cgcontextrelease(bitmap);     cgimagerelease(newimageref);     cgimagerelease(imageref);      return newimage; } 

on screenshot above can see how memory usage gets higher every image taken (and being processed method). btw using sdk 7 , arc.

how can rid of leak or whatever is? needs dealloced (or did miss in code)?