Ridimensionare una UIImage

- (UIImage*)imageScale:(UIImage *)imageToScale factor:(CGFloat)factor;

{

	CGSize size = CGSizeMake( imageToScale.size.width*factor, imageToScale.size.height*factor );

	// Create a bitmap graphics context

	// This will also set it as the current context

	UIGraphicsBeginImageContext(size);

	// Draw the scaled image in the current context

	[imageToScale 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 scaledImage;

}