Remove masking from an UIImage in iOS - ios

Question

I am masking an UIImage in iOS. I want to remove that mask now. How will I achieve it. This is my code for masking the image :
UIColor *header1Color = [UIColor colorWithRed:0.286 green:0.286 blue:0.286 alpha:0.1];
UIImage *img = self.calorie_image.image;
// int width = img.size.width; //308
// int height = img.size.height; //67
UIGraphicsBeginImageContext(img.size);
CGContextRef context = UIGraphicsGetCurrentContext();
[header1Color setFill];
// translate/flip the graphics context (for transforming from CG* coords to UI* coords
CGContextTranslateCTM(context, 0, img.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
// set the blend mode to color burn, and the original image
CGContextSetBlendMode(context, kCGBlendModeColorBurn);
CGRect rect = CGRectMake(0, 0, img.size.width, img.size.height);
CGContextDrawImage(context, rect, img.CGImage);
//calorie_value = 230;
int x = 200;
int y = 0;
int mwidth = 120;
int mheight = 67;
NSString *zone = #"";
NSArray *min = [[NSArray alloc] initWithObjects:#"0", #"1200", #"1800", #"2200", nil];
NSArray *max = [[NSArray alloc] initWithObjects:#"1200", #"1800", #"2200", #"3500", nil];
NSArray *x_values = [[NSArray alloc] initWithObjects:#"42", #"137", #"200", #"320", nil];
NSArray *mwidth_values = [[NSArray alloc] initWithObjects:#"278", #"183", #"120", #"0", nil];
NSArray *zones = [[NSArray alloc] initWithObjects:#"red", #"green", #"orange", #"red", nil];
for (int i=0; i < 4; i++) {
if(calorie_value >= [min[i] integerValue] && calorie_value <= [max[i] integerValue]) {
zone = zones[i];
x = [x_values[i] integerValue];
mwidth = [mwidth_values[i] integerValue];
break;
}
}
if([[DiabetaDbTransaction getToadyCalories] integerValue] > 0) {
CGContextClearRect(context, CGRectMake(x,y,mwidth,mheight));
}
// set a mask that matches the shape of the image, then draw (color burn) a colored rectangle
CGContextClipToMask(context, rect, img.CGImage);
CGContextAddRect(context, rect);
CGContextDrawPath(context,kCGPathFill);
// generate a new UIImage from the graphics context we drew onto
UIImage *coloredImg = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
self.calorie_image.image = coloredImg;

Answer 1

How about to store the orginal image as an ivar
and when you want to remove mask just :
#implementation ViewController {
UIImage *coloredImg_orginal;
}
Before you add mask to image set coloredImg_orginal.
coloredImg_orginal = self.calorie_image.image;
and in the function to remove mask just set orgial image instead of the mask image
self.calorie_image.image = coloredImg_orginal;
(sorry for my bad english)