Image Processing : Image Colour Changed

Image Processing : Image Colour Changed when Slider Value is Changed 

Framework :
  Core Image Framework added into Your project

New.h :

#import <UIKit/UIKit.h>

#import <CoreImage/CoreImage.h> 

@interface New : UIViewController

{

    UIImage *Imagesss;

    IBOutlet UIImageView *theImageView;

    IBOutlet UISlider *slider_hue;

}

@property (nonatomic, retain) IBOutlet UISlider *slider_hue;

@property (nonatomic, retain) IBOutlet UIImageView *theImageView;

-(IBAction)huechange:(id)sender;

-(IBAction)huevaluechange:(id)sender;

- (IBAction)original:(id)sender;

@end

New.m :

@synthesize theImageView, slider_hue;

- (void)viewDidLoad

{

    [super viewDidLoad];

    Imagesss = [UIImage imageNamed:@"hair.png"];

}

- (IBAction)original:(id)sender

{

    theImageView.image = [UIImage imageNamed:@"hair.png"];

}

//Method 1

-(IBAction)huevaluechange:(id)sender

{

    float f= slider_hue.value;

    

    UIImage *image = [self imageWithImage:Imagesss rotatedByHue:f];

    

    [theImageView setImage:image];

}

//Method 2

-(IBAction)huechange:(id)sender

{

    float f= slider_hue.value;

   

    UIImage *image = [self imageWithImage:[UIImage imageNamed:@"hair.png"] fixedHue:f alpha:1.0];

    [theImageView setImage:image];

}

//Method 1 - Function

- (UIImage*) imageWithImage:(UIImage*) source rotatedByHue:(CGFloat) deltaHueRadians;

{

    // Create a Core Image version of the image.

    CIImage *sourceCore = [CIImage imageWithCGImage:[source CGImage]];

    // Apply a CIHueAdjust filter

    CIFilter *hueAdjust = [CIFilter filterWithName:@"CIHueAdjust"];

    [hueAdjust setDefaults];

    [hueAdjust setValue: sourceCore forKey: @"inputImage"];

    [hueAdjust setValue: [NSNumber numberWithFloat: deltaHueRadians] forKey: @"inputAngle"];

    CIImage *resultCore = [hueAdjust valueForKey: @"outputImage"];

    

    // Convert the filter output back into a UIImage.

    // This section from http://stackoverflow.com/a/7797578/1318452

    CIContext *context = [CIContext contextWithOptions:nil];

    CGImageRef resultRef = [context createCGImage:resultCore fromRect:[resultCore extent]];

    UIImage *result = [UIImage imageWithCGImage:resultRef];

    CGImageRelease(resultRef);

    return result;

}

//Method 2 - Function

- (UIImage*) imageWithImage:(UIImage*) source fixedHue:(CGFloat) hue alpha:(CGFloat) alpha;

{

     // Note: the hue input ranges from 0.0 to 1.0, both red.  Values outside this range will be clamped to 0.0 or 1.0.

    // Find the image dimensions.

    CGSize imageSize = [source size];

    CGRect imageExtent = CGRectMake(0,0,imageSize.width,imageSize.height);

    

    // Create a context containing the image.

    UIGraphicsBeginImageContext(imageSize);

    CGContextRef context = UIGraphicsGetCurrentContext();

    [source drawAtPoint:CGPointMake(0,0)];

    

    // Draw the hue on top of the image.

    CGContextSetBlendMode(context, kCGBlendModeHue);

    [[UIColor colorWithHue:hue saturation:1.0 brightness:1.0 alpha:alpha] set];

    UIBezierPath *imagePath = [UIBezierPath bezierPathWithRect:imageExtent];

    [imagePath fill];

    

    // Retrieve the new image.

    UIImage *result = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return result;

}

New.xib :

//Method 1 - Slider Value

slider value is range from 0 to 6

//Method 2 - Slider Value

slider value is range from 0 to 1

Output :

App Start Page

Change the Slider Value

AppDelegate Method - Store a Variable (Singleton)

AppDelegate.h :

#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>

{

 NSString *name;

}

@property(strong,nonatomic)NSString *name;

@end

AppDelegate.m :
 //Nothing Do

SomeFile.h :

#import "AppDelegate.h"

@interface SomeFile : UIViewController

{

    

}

-(IBAction)save:(id)sender;

-(IBAction)retrive:(id)sender;

@end

SomeFile.m :
-(IBAction)save:(id)sender
{
      AppDelegate *del=(AppDelegate *)[[UIApplication sharedApplication]delegate];
      [del setName:txt_name.text];
}

-(IBAction)retrive:(id)sender
{
      AppDelegate *del=(AppDelegate *)[[UIApplication sharedApplication]delegate];
     if (del.name==nil)

     {

           // Login page is showed

     }

     else

     {

           NSString *name = del.name; 

     }

}

Singleton Object Creation

Singleton Object Creation

Defn:

In computer programming a singleton variable is a variable that is referred to only once.

Examples of where a variable might only be referenced once is as a dummy argument in a function call, or when its address is assigned to another variable which subsequently accesses its allocated storage.

Singleton variables sometimes occur because a mistake has been made – such as assigning a value to a variable and forgetting to use it later, or mistyping one instance of the variable name. Some compilers and lint-like tools flag occurrences of singleton variables.

Creating Singleton Object File:

In Sample Project we can add the file in Xcode tool.

File --> New --> File --> Choose Objective-C class --> Next --> 

class Name is "singleton" 
subclass is NSObject is Selected.

Next --> Finish.


singleton.h :

 #import <Foundation/Foundation.h>

@interface Singleton : NSObject

//Create the variables or objects.

@property(nonatomic,assign) float ad_height;

@property(nonatomic,assign) BOOL ads_removed,is_ipad;

@property(nonatomic, assign) CGRect banner_land;

@property(nonatomic, assign) CGRect banner_port;

@property(nonatomic,assign) UIInterfaceOrientation last_orient;

@property(nonatomic,assign) NSString *lastsss;

+(Singleton *)singleObj;  //class method

//-(void)Objsin;   //instance method

@end

singleton.m :

 #import "Singleton.h"

@implementation Singleton

@synthesize lastsss;

+(Singleton *)singleObj     //class Method

{

    

    static Singleton * single=nil;

    

    @synchronized(self)

    {

        if(!single)

        {

            single = [[Singleton alloc] init];

        }

    }

    return single;

}

-(void)Objsin      //instance method

{

    lastsss = @"aaa";

}

@end

SomeFile.h :

#import "Singleton.h"

@interface SomeFile : UIViewController

{

    Singleton *sobj;

}

SomeFile.m :

  //public method. Access from any page. Deallocate when app is closed.

-(void) viewwillappear method

{
   //reference to allocate

   sobj = [Singleton singleObj];    

   //Method calling
   [sobj Objsin];

    //Assign the values
    NSString *str= @"bb";

    sobj.lastsss = str;

    sobj.last_orient = [UIApplication sharedApplication].statusBarOrientation;

    sobj.banner_land = _bannerView.frame;   //CGRect(0, 0, 0, 0)

    sobj.banner_port = _bannerView.frame;   //CGRect(0, 0, 0, 0)

    sobj.ad_height = 40.0;

    sobj.is_ipad = (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad);    //YES or NO

    sobj.ads_removed = NO;

}

               (or)

 //private method. Access only this page. Deallocate when page is moved.

-(void) viewwillappear method

{

    //initiate memory allocation

    sobj = [[Singleton alloc]init];

    //Method calling

    [sobj Objsin]; 


    //Assign the values
    NSString *str= @"bb";

    sobj.lastsss = str;

    sobj.last_orient = [UIApplication sharedApplication].statusBarOrientation;

    sobj.banner_land = _bannerView.frame;   //CGRect(0, 0, 0, 0)

    sobj.banner_port = _bannerView.frame;   //CGRect(0, 0, 0, 0)

    sobj.ad_height = 40.0;

    sobj.is_ipad = (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad);    //YES or NO

    sobj.ads_removed = NO;

}