对一个指定的图片加上文字水印效果代码,Asp.Net代码库,德仔网

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【Asp.Net】对一个指定的图片加上文字水印效果

作者:Dezai.CN / 发布于2011/6/30/ 503

<div>/// <summary> 
/// 对一个指定的图片加上文字水印效果。 
/// </summary> 
/// <param name="imageFile">图片文件地址 </param> 
/// <param name="waterText">水印文字内容 </param> 
public static void CreateTextWaterMark(string imageFile, string waterText) 
{ 
 if (string.IsNullOrEmpty(imageFile) || string.IsNullOrEmpty(waterText) || !File.Exists(imageFile)) 
 { 
 return; 
 } 
 
 System.Drawing.Image originalImage = System.Drawing.Image.FromFile(imageFile); 
 
 Graphics graphics = Graphics.FromImage(originalImage); 
 
 graphics.SmoothingMode = SmoothingMode.HighQuality; 
 graphics.TextRenderingHint = TextRenderingHint.ClearTypeGridFit; 
 graphics.CompositingQuality = CompositingQuality.HighQuality; 
 graphics.InterpolationMode = InterpolationMode.HighQualityBicubic; 
 
 SolidBrush brush = new SolidBrush(Color.FromArgb(153, 255, 255, 255)); 
 Font waterTextFont = new Font("Arial", 16, FontStyle.Regular); 
 SizeF waterTextSize = graphics.MeasureString(waterText, waterTextFont); 
 
 float x = (float)originalImage.Width - waterTextSize.Width - 10F; 
 float y = (float)originalImage.Height - waterTextSize.Height - 10F; 
 
 graphics.DrawString(waterText, waterTextFont, brush, x, y); 
 
 graphics.Dispose(); 
 brush.Dispose(); 
 
 MemoryStream stream = new MemoryStream(); 
 originalImage.Save(stream, ImageFormat.Jpeg); 
 originalImage.Dispose(); 
 
 System.Drawing.Image imageWithWater = System.Drawing.Image.FromStream(stream); 
 
 imageWithWater.Save(imageFile); 
 imageWithWater.Dispose(); 
} 
</div>

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　文字水印　

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