Question

if UIImage is an autorelease object, why when I analyze does it complain that on the 2nd line below there is a potential leak stored to image:

    NSData *data = [[NSData alloc] initWithContentsOfURL: ImageURL];
    UIImage *image = [[UIImage alloc] initWithData: data];

    [data release];
    // Do we want to round the corners?
    image = [self roundCorners: image];

    // Is it PNG or JPG/JPEG?
    // Running the image representation function writes the data from the image to a file
    if([ImageURLString rangeOfString: @".png" options: NSCaseInsensitiveSearch].location != NSNotFound)
    {
        [UIImagePNGRepresentation(image) writeToFile: uniquePath atomically: YES];
    }
    else if(
            [ImageURLString rangeOfString: @".jpg" options: NSCaseInsensitiveSearch].location != NSNotFound || 
            [ImageURLString rangeOfString: @".jpeg" options: NSCaseInsensitiveSearch].location != NSNotFound
            )
    {
        [UIImageJPEGRepresentation(image, 100) writeToFile: uniquePath atomically: YES];
    }

Answer 1

Why do you say your UIImage is autoreleased? I see only

UIImage *image = [[UIImage alloc] initWithData: data];

Use instead

UIImage *image = [[[UIImage alloc] initWithData: data] autorelease];

As an alternative you may use:

UIImage *tmp = [[UIImage alloc] initWithData: data];

UIImage *image = [self roundCorners: tmp];

[tmp release];

(assuming roundCorners returns an autoreleased object).