C# 给图片添加透明的文字、图片水印
2024-08-28 13:41:47
#region 添加水印
/// <summary>
/// 添加文字水印
/// </summary>
/// <param name="image"></param>
/// <param name="text"></param>
/// <param name="fontSize">字体大小</param>
/// <param name="rectX">水印开始X坐标(自动扣除文字宽度)</param>
/// <param name="rectY">水印开始Y坐标(自动扣除文字高度</param>
/// <param name="opacity">0-255 值越大透明度越低</param>
/// <param name="externName">文件后缀名</param>
/// <returns></returns>
public static Image AddTextToImg(Image image, string text, float fontSize, float rectX, float rectY, int opacity, string externName)
{ Bitmap bitmap = new Bitmap(image, image.Width, image.Height); Graphics g = Graphics.FromImage(bitmap); //下面定义一个矩形区域
float rectWidth = text.Length * (fontSize + );
float rectHeight = fontSize + ; //声明矩形域 RectangleF textArea = new RectangleF(rectX - rectWidth, rectY - rectHeight, rectWidth, rectHeight); Font font = new Font("微软雅黑", fontSize, FontStyle.Bold); //定义字体 Brush whiteBrush = new SolidBrush(Color.FromArgb(opacity, , , )); //画文字用 g.DrawString(text, font, whiteBrush, textArea); MemoryStream ms = new MemoryStream(); //保存图片
switch (externName)
{
case ".jpg":
bitmap.Save(ms, ImageFormat.Jpeg);
break;
case ".gif":
bitmap.Save(ms, ImageFormat.Gif);
break;
case ".png":
bitmap.Save(ms, ImageFormat.Png);
break;
default:
bitmap.Save(ms, ImageFormat.Jpeg);
break;
} Image h_hovercImg = Image.FromStream(ms); g.Dispose(); bitmap.Dispose(); return h_hovercImg; } /// <summary>
/// 添加图片水印
/// </summary>
/// <param name="image"></param>
/// <param name="text"></param>
/// <param name="rectX">水印开始X坐标(自动扣除图片宽度)</param>
/// <param name="rectY">水印开始Y坐标(自动扣除图片高度</param>
/// <param name="opacity">透明度 0-1</param>
/// <param name="externName">文件后缀名</param>
/// <returns></returns>
public static Image AddImgToImg(Image image, Image watermark, float rectX, float rectY, float opacity, string externName)
{ Bitmap bitmap = new Bitmap(image, image.Width, image.Height); Graphics g = Graphics.FromImage(bitmap); //下面定义一个矩形区域
float rectWidth = watermark.Width + ;
float rectHeight = watermark.Height + ; //声明矩形域
RectangleF textArea = new RectangleF(rectX - rectWidth, rectY - rectHeight, rectWidth, rectHeight); Bitmap w_bitmap = ChangeOpacity(watermark, opacity); g.DrawImage(w_bitmap, textArea); MemoryStream ms = new MemoryStream(); //保存图片
switch (externName)
{
case ".jpg":
bitmap.Save(ms, ImageFormat.Jpeg);
break;
case ".gif":
bitmap.Save(ms, ImageFormat.Gif);
break;
case ".png":
bitmap.Save(ms, ImageFormat.Png);
break;
default:
bitmap.Save(ms, ImageFormat.Jpeg);
break;
} Image h_hovercImg = Image.FromStream(ms); g.Dispose(); bitmap.Dispose();
return h_hovercImg; } /// <summary>
/// 改变图片的透明度
/// </summary>
/// <param name="img">图片</param>
/// <param name="opacityvalue">透明度</param>
/// <returns></returns>
public static Bitmap ChangeOpacity(Image img, float opacityvalue)
{ float[][] nArray ={ new float[] {, , , , }, new float[] {, , , , }, new float[] {, , , , }, new float[] {, , , opacityvalue, }, new float[] {, , , , }}; ColorMatrix matrix = new ColorMatrix(nArray); ImageAttributes attributes = new ImageAttributes(); attributes.SetColorMatrix(matrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap); Image srcImage = img; Bitmap resultImage = new Bitmap(srcImage.Width, srcImage.Height); Graphics g = Graphics.FromImage(resultImage); g.DrawImage(srcImage, new Rectangle(, , srcImage.Width, srcImage.Height), , , srcImage.Width, srcImage.Height, GraphicsUnit.Pixel, attributes); return resultImage;
} #endregion
Image img = Image.FromStream(file.InputStream);
string externName = Path.GetExtension(file.FileName); //添加文字水印
System.Drawing.Image t_img = Upload.AddTextToImg(img, "我是水印",14.0f, img.Width - , img.Height - , , externName); //添加图片水印
Image watermark =
Image.FromFile(Server.MapPath("/content/images/common/logo_main.png"));//水印图片
System.Drawing.Image t2_img = Upload.AddImgToImg(img, watermark, img.Width - , img.Height - , 0.5f, externName);
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