[C#]이미지 크기 변경

private Image ScaleImage(Image image, float scale)
{
	if (image == null) return null;

	int width = (int)(image.Width * scale);
	int height = (int)(image.Height * scale);

	Bitmap bm = new Bitmap(width, height);
	using (Graphics gr = Graphics.FromImage(bm))
	{
		gr.InterpolationMode = InterpolationMode.HighQualityBicubic;
		Rectangle dest_rect = new Rectangle(0, 0, width, height);
		Rectangle source_rect = new Rectangle(0, 0, image.Width, image.Height);
		gr.DrawImage(image, dest_rect, source_rect, GraphicsUnit.Pixel);
	}

	return bm;
}