iPhone:-simplest way to crop image of desired shape and size - iphone

Question

i am trying to crop image according to my desire....for my cinemagram type app.....and use it in my application
i have tried a lot of options but none of tham is...usefull for me
i read answers on stack over flow but of no use
plzz help me out
image = [UIImage imageNamed:#"images2.jpg"];
imageView = [[UIImageView alloc] initWithImage:image];
CGSize size = [image size];
[imageView setFrame:CGRectMake(0, 0, size.width, size.height)];
[[self view] addSubview:imageView];
[imageView release];
thanks

Answer 1

Here is the exact code to resize your image to desired size
CGSize itemSize = CGSizeMake(320,480); // give any size you want to give
UIGraphicsBeginImageContext(itemSize);
CGRect imageRect = CGRectMake(0.0, 0.0, itemSize.width, itemSize.height);
[myimage drawInRect:imageRect];
myimage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
Now my image is of your desired size

Answer 2

Please find the code below to the crop the image.
// Create the image from a png file
UIImage *image = [UIImage imageNamed:#"prgBinary.jpg"];
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
// Get size of current image
CGSize size = [image size];
// Frame location in view to show original image
[imageView setFrame:CGRectMake(0, 0, size.width, size.height)];
[[self view] addSubview:imageView];
[imageView release];
// Create rectangle that represents a cropped image
// from the middle of the existing image
CGRect rect = CGRectMake(size.width / 4, size.height / 4 ,
(size.width / 2), (size.height / 2));
// Create bitmap image from original image data,
// using rectangle to specify desired crop area
CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], rect);
UIImage *img = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
// Create and show the new image from bitmap data
imageView = [[UIImageView alloc] initWithImage:img];
[imageView setFrame:CGRectMake(0, 200, (size.width / 2), (size.height / 2))];
[[self view] addSubview:imageView];
[imageView release];
Referred from How to Crop an Image

Answer 3

I think this is the most simple way:
CGRect rect = CGRectMake(0.0, 0.0, 320.0, 430.0);
CGImageRef tempImage = CGImageCreateWithImageInRect([originalImage CGImage], rect);
UIImage *newImage = [UIImage imageWithCGImage:tempImage];
CGImageRelease(tempImage);
But don't forget to clear imageOrientation BEFORE cropping, otherwise you will get rotated image after cropping:
-(UIImage *)normalizeImage:(UIImage *)raw {
if (raw.imageOrientation == UIImageOrientationUp) return raw;
UIGraphicsBeginImageContextWithOptions(raw.size, NO, raw.scale);
[raw drawInRect:(CGRect){0, 0, raw.size}];
UIImage *normalizedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return normalizedImage;
}

Answer 4

Here is a class using Dinesh's answer to get a square thumbnail of an image
class func returnSquareCroppedImage(theImage:UIImage)->UIImage{
var mySize:CGFloat = 100.0
var imageRect:CGRect
if theImage.size.width > theImage.size.height {
mySize = theImage.size.height
let xAdjust = 0-((theImage.size.width - theImage.size.height)/2)
imageRect = CGRectMake(xAdjust, 0, theImage.size.width, theImage.size.height)
}else{
mySize = theImage.size.width
let yAdjust = 0-((theImage.size.height - theImage.size.width)/2)
imageRect = CGRectMake(0, yAdjust, theImage.size.width, theImage.size.height)
}
UIGraphicsBeginImageContext(CGSizeMake(mySize, mySize))
theImage.drawInRect(imageRect)
let returnImage = UIGraphicsGetImageFromCurrentImageContext()
return returnImage
}