-(UIImage*)scaleToSize:(CGSize)size image:(UIImage*)image
{
    UIGraphicsBeginImageContext(size);

    // Draw the scaled image in the current context
    [image drawInRect:CGRectMake(0, 0, size.width, size.height)];

    // Create a new image from current context
    UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();

    // Pop the current context from the stack
    UIGraphicsEndImageContext();

    // Return our new scaled image
    return scaledImage;
}

-(UIImage *)cropCanvas:(UImage *)input x1:(int)x1 y1:(int)y1 x2:(int)x2 y2:(int)y2{
    CGRect rect = CGRectMake(x1, y1, input.size.width-x2-x1, input.size.height-y2-y1);
    CGImageRef imageref = CGImageCreateWithImageInRect([input CGImage], rect);
    UIImage *img = [UIImage imageWithCGImage:imageref];
    return img;
}