Received Memory Warning while stitching images - iphone

Question

I am developing an app in which I have to stitch multiple images one by one when ever the user takes picture from camera.
This is what I am using to merge two images.
[self performSelector:#selector(joinImages:secondImage:) withObject:firstimage withObject:imageCaptured];
- (UIImage *)joinImages:(UIImage *)im1 secondImage:(UIImage *)im2
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
//Joins 2 UIImages together, stitching them horizontally
CGSize size = CGSizeMake(im1.size.width+im2.size.width, im2.size.height);
UIGraphicsBeginImageContext(size);
CGPoint image1Point = CGPointMake(0, 0);
[im1 drawAtPoint:image1Point];
CGPoint image2Point = CGPointMake(im1.size.width,0);
[im2 drawAtPoint:image2Point];
UIImage* finalImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
firstimage=finalImage;// final images updated everytime
[pool release];
return finalImage;
}
But I receive memory warning when I run this in iPhone and it works fine for iPod.
Also images are cropped in case of iPhone.
Anything I can do to resolve this problem.
Thanks..

Answer 1

You could do something like this.
- (UIImage *)joinImages:(UIImage *)im1 secondImage:(UIImage *)im2
{
#autoreleasepool
{
//Joins 2 UIImages together, stitching them horizontally
CGSize size = CGSizeMake(im1.size.width+im2.size.width, im2.size.height);
UIGraphicsBeginImageContext(size);
CGPoint image1Point = CGPointMake(0, 0);
[im1 drawAtPoint:image1Point];
CGPoint image2Point = CGPointMake(im1.size.width,0);
[im2 drawAtPoint:image2Point];
UIImage* finalImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
firstimage=finalImage;// final images updated everytime
return finalImage;
}
}
Hope this will work for you.

Answer 2

[self joinImages:firstimage secondImage:secondImage];
- (UIImage *)joinImages:(UIImage *)im1 secondImage:(UIImage *)im2
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
//Joins 2 UIImages together, stitching them horizontally
CGSize size = CGSizeMake(im1.size.width+im2.size.width, im2.size.height);
UIGraphicsBeginImageContext(size);
CGPoint image1Point = CGPointMake(0, 0);
[im1 drawAtPoint:image1Point];
CGPoint image2Point = CGPointMake(im1.size.width,0);
[im2 drawAtPoint:image2Point];
UIImage* finalImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
firstimage=finalImage;// final images updated everytime
[pool release];
return finalImage;
}