iOS - Resize a UIImage - actually resizes the data for uploading!

Helper.m

//takes an image, and returns a dictionary with multiple sizes
-(NSDictionary *)resizeImage:(UIImage *)theImage
{
    //Create the "large" size image to upload
    float actualHeight = theImage.size.height;
    float actualWidth = theImage.size.width;
    float imgRatio = actualWidth/actualHeight;
    //set the maximum size you want - width/height
    float maxRatio = 640.0/960.0;
    //determine the required size to use
    if(imgRatio!=maxRatio){
        if(imgRatio < maxRatio){
            imgRatio = 960.0 / actualHeight;
            actualWidth = imgRatio * actualWidth;
            actualHeight = 960.0;
        }
        else{
            imgRatio = 640.0 / actualWidth;
            actualHeight = imgRatio * actualHeight;
            actualWidth = 640.0;
        }
    }
    CGRect rect = CGRectMake(0.0, 0.0, actualWidth, actualHeight);
    //createa a new graphics context
    UIGraphicsBeginImageContext(rect.size);
    [theImage drawInRect:rect];
    //create a new UIImage to hold the "large" resize
    UIImage *full = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    //Create the thumbnail image to upload
    //the dance is very similar!
    actualHeight = theImage.size.height;
    actualWidth = theImage.size.width;
    imgRatio = actualWidth/actualHeight;
    maxRatio = 160.0/240.0;
    if(imgRatio!=maxRatio){
        if(imgRatio < maxRatio){
            imgRatio = 240.0 / actualHeight;
            actualWidth = imgRatio * actualWidth;
            actualHeight = 240.0;
        }
        else{
            imgRatio = 160.0 / actualWidth;
            actualHeight = imgRatio * actualHeight;
            actualWidth = 160.0;
        }
    }
    rect = CGRectMake(0.0, 0.0, actualWidth, actualHeight);
    UIGraphicsBeginImageContext(rect.size);
    [theImage drawInRect:rect];
    //create a new UIIimage to hold the "thumb" size
    UIImage *thumb = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:theImage, @"original", full, @"full", thumb, @"thumb" nil];
    
    return dict;
}