Core Image Filter iOS UISlider -


i'm trying implement sepia filter on image loaded ui view photo library.

i have ui slider...range -1 1. , applying effect sepia.

the problem i'm having is, on effect getting summed up. like...if put slider 1, move 0. doesn't bring image original form. , move 1..total sepia applied 2 times. 

- (ibaction)slidermove:(id)sender {      currentvalue=_slidervalue.value;      if (currentbutton==1)     {         //1         ciimage *beginimage = [ciimage imagewithdata: uiimagepngrepresentation(self.imageview.image)];          //2         cicontext *context = [cicontext contextwithoptions:nil];          //3         cifilter *filter = [cifilter filterwithname:@"cisepiatone"                                       keysandvalues: kciinputimagekey, beginimage,                             @"inputintensity", [nsnumber numberwithfloat:currentvalue], nil];          //4         ciimage *outputimage = [filter outputimage];          cgimageref cgimg = [context createcgimage:outputimage fromrect:[outputimage extent]];          //5         self.imageview.image = [uiimage imagewithcgimage:cgimg];          //6         cgimagerelease(cgimg);     }   }    - (ibaction)applyeffect:(id)sender {     currentbutton=1;   }

the problem occurring because don't save original image. change image each time slider changes, effect compounds. here should instead:

in @interface:

@property(strong, nonatomic)uiimage *originalimage;

in @implementation:

-(void)viewdidload{     [super viewdidload];     self.imageview.image = self.originalimage; }

then when effect, apply originalimage property , show result in self.imageview.


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