How to crop a particular image in iphone - iphone

Question

I am working on Camera Application user are taking a picture its fine,but i want to crop anywhere in that image and send it to server. How can I do this?

Answer 1

Check out this link for details:
http://www.hive05.com/2008/11/crop-an-image-using-the-iphone-sdk/
Basic code:
- (UIImage*)imageByCropping:(UIImage *)imageToCrop toRect:(CGRect)rect
{
//create a context to do our clipping in
UIGraphicsBeginImageContext(rect.size);
CGContextRef currentContext = UIGraphicsGetCurrentContext();
//create a rect with the size we want to crop the image to
//the X and Y here are zero so we start at the beginning of our
//newly created context
CGRect clippedRect = CGRectMake(0, 0, rect.size.width, rect.size.height);
CGContextClipToRect( currentContext, clippedRect);
//create a rect equivalent to the full size of the image
//offset the rect by the X and Y we want to start the crop
//from in order to cut off anything before them
CGRect drawRect = CGRectMake(rect.origin.x * -1,
rect.origin.y * -1,
imageToCrop.size.width,
imageToCrop.size.height);
//draw the image to our clipped context using our offset rect
CGContextDrawImage(currentContext, drawRect, imageToCrop.CGImage);
//pull the image from our cropped context
UIImage *cropped = UIGraphicsGetImageFromCurrentImageContext();
//pop the context to get back to the default
UIGraphicsEndImageContext();
//Note: this is autoreleased
return cropped;
}

Answer 2

I think i can provide a better solution to that large amount of code.
- (void)viewDidLoad
{
[super viewDidLoad];
// do something......
UIImage *croppedImage = [self imageByCropping:[UIImage imageNamed:#"SomeImage.png"] toRect:CGRectMake(10, 10, 100, 100)];
}
- (UIImage*)imageByCropping:(UIImage *)imageToCrop toRect:(CGRect)rect
{
CGImageRef imageRef = CGImageCreateWithImageInRect([imageToCrop CGImage], rect);
UIImage *cropped = [UIImage imageWithCGImage:imageRef];
return cropped;
}