图像水印为了防止被其他人直接或间接使用或利用图片进行宣传，故需要为图片添加水印，本程序利用GDI+实现图像的水印效果-Image watermark to prevent other people directly or indirectly use or use images for publicity, they need to add a picture watermark, the use of GDI+ to achieve this program the watermark ima