C#给图片添加水印完整实例资源-CSDN下载

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C#给图片添加水印完整实例给图片添加水印完整实例

本文实例讲述了C#给图片添加水印的方法。分享给大家供大家参考，具体如下：

using System;

using System.Data;

using System.Configuration;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.Drawing;

using System.IO;

using System.Drawing.Imaging;

/// <summary>

///ImgWater 的摘要说明

/// </summary>

public class ImgWater

{

public ImgWater()

{

//TODO: 在此处添加构造函数逻辑

}

/// <summary>

/// 图片水印

/// </summary>

/// <param name="ImgFile">原图文件地址</param>

/// <param name="WaterImg">水印图片地址</param>

/// <param name="sImgPath">水印图片保存地址</param>

/// <param name="Alpha">水印透明度设置</param>

/// <param name="iScale">水印图片在原图上的显示比例</param>

/// <param name="intDistance">水印图片在原图上的边距确定,以图片的右边和下边为准,当设定的边距超过一定大小后参数会自动失效</param>

public bool zzsImgWater(

string ImgFile

, string WaterImg

, string sImgPath

, float Alpha

, float iScale

, int intDistance

)

{

try

{

//装载图片

FileStream fs = new FileStream(ImgFile, FileMode.Open);

BinaryReader br = new BinaryReader(fs);

byte[] bytes = br.ReadBytes((int)fs.Length);

br.Close();

fs.Close();

MemoryStream ms = new MemoryStream(bytes);

System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(ms);

//System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(ImgFile);

int imgPhotoWidth = imgPhoto.Width;

int imgPhotoHeight = imgPhoto.Height;

System.Drawing.Image imgWatermark = new Bitmap(WaterImg);

int imgWatermarkWidth = imgWatermark.Width;

int imgWatermarkHeight = imgWatermark.Height;

//计算水印图片尺寸

decimal aScale = Convert.ToDecimal(iScale);

decimal pScale = 0.05M;

decimal MinScale = aScale - pScale;

decimal MaxScale = aScale + pScale;

int imgWatermarkWidthNew = imgWatermarkWidth;

int imgWatermarkHeightNew = imgWatermarkHeight;

if (imgPhotoWidth >= imgWatermarkWidth && imgPhotoHeight >= imgWatermarkHeight && imgPhotoWidth >= imgPhotoHeight)

if (imgWatermarkWidth > imgWatermarkHeight)

if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7)) &&

(Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7) <= MaxScale))

{

}

else

{

imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale);

imgWatermarkHeightNew = Convert.ToInt32((imgPhotoWidth * aScale / imgWatermarkWidth) * imgWatermarkHeight);

}

else

if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7)) &&

(Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7) <= MaxScale))

{

}

else

{

imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale);

imgWatermarkWidthNew = Convert.ToInt32((imgPhotoHeight * aScale / imgWatermarkHeight) * imgWatermarkWidth);

}

if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgWatermarkWidth >= imgWatermarkHeight)

{

imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale);

imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight);

}

if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight <= imgPhotoHeight && imgPhotoWidth >= imgPhotoHeight)

{

imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale);

imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight);

}

if (imgWatermarkWidth <= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgPhotoWidth >= imgPhotoHeight)

{

imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale);

imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth);

}

if (imgPhotoWidth >= imgWatermarkWidth && imgPhotoHeight >= imgWatermarkHeight && imgPhotoWidth <= imgPhotoHeight)

if (imgWatermarkWidth > imgWatermarkHeight)

if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7)) &&

(Math.Round((Convert.ToDecimal(imgWatermarkWidth) / Convert.ToDecimal(imgPhotoWidth)), 7) <= MaxScale))

{

}

else

{

imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale);

imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight);

}

else

if ((MinScale <= Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7)) &&

(Math.Round((Convert.ToDecimal(imgWatermarkHeight) / Convert.ToDecimal(imgPhotoHeight)), 7) <= MaxScale))

{

}

else

{

imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale);

imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth);

}

if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgWatermarkWidth <= imgWatermarkHeight)

{

imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale);

imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth);

}

if (imgWatermarkWidth >= imgPhotoWidth && imgWatermarkHeight <= imgPhotoHeight && imgPhotoWidth <= imgPhotoHeight)

{

imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale);

imgWatermarkHeightNew = Convert.ToInt32(((imgPhotoWidth * aScale) / imgWatermarkWidth) * imgWatermarkHeight);

}

if (imgWatermarkWidth <= imgPhotoWidth && imgWatermarkHeight >= imgPhotoHeight && imgPhotoWidth <= imgPhotoHeight)

{

imgWatermarkHeightNew = Convert.ToInt32(imgPhotoHeight * aScale);

imgWatermarkWidthNew = Convert.ToInt32(((imgPhotoHeight * aScale) / imgWatermarkHeight) * imgWatermarkWidth);

}

//将原图画出来

Bitmap bmPhoto = new Bitmap(imgPhotoWidth, imgPhotoHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);

bmPhoto.SetResolution(72, 72);

Graphics gbmPhoto = Graphics.FromImage(bmPhoto);

gbmPhoto.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

gbmPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

gbmPhoto.Clear(Color.White);

gbmPhoto.DrawImage(

imgPhoto

, new Rectangle(0, 0, imgPhotoWidth, imgPhotoHeight)

, 0

, imgPhotoWidth

, imgPhotoHeight

, GraphicsUnit.Pixel

);

Bitmap bmWatermark = new Bitmap(bmPhoto);

bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);

Graphics gWatermark = Graphics.FromImage(bmWatermark);

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