C#给图片添加水印完整实例
作者：思齐_
这篇文章主要介绍了C#给图片添加水印的方法,以完整实例形式分析了C#实现文字及图像水印、缩略图、图片剪切等相关技巧,需要的朋友可以参考下
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
, 0
, imgPhotoWidth
, imgPhotoHeight
, GraphicsUnit.Pixel
);
Bitmap bmWatermark = new Bitmap(bmPhoto);
bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
Graphics gWatermark = Graphics.FromImage(bmWatermark);
//指定高质量显示水印图片质量
gWatermark.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
gWatermark.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
ImageAttributes imageAttributes = new ImageAttributes();
//设置两种颜色,达到合成效果
ColorMap colorMap = new ColorMap();
colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
ColorMap[] remapTable = { colorMap };
imageAttributes.SetRemapTable(remapTable, System.Drawing.Imaging.ColorAdjustType.Bitmap);
//用矩阵设置水印图片透明度
float[][] colorMatrixElements = {
new float[] {1.0f, 0.0f, 0.0f, 0.0f, 0.0f},
new float[] {0.0f, 1.0f, 0.0f, 0.0f, 0.0f},
new float[] {0.0f, 0.0f, 1.0f, 0.0f, 0.0f},
new float[] {0.0f, 0.0f, 0.0f, Alpha, 0.0f},
new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f}
};
System.Drawing.Imaging.ColorMatrix wmColorMatrix = new System.Drawing.Imaging.ColorMatrix(colorMatrixElements);
imageAttributes.SetColorMatrix(wmColorMatrix, System.Drawing.Imaging.ColorMatrixFlag.Default, System.Drawing.Imaging.ColorAdjustType.Bitmap);
//确定水印边距
int xPos = imgPhotoWidth - imgWatermarkWidthNew;
int yPos = imgPhotoHeight - imgWatermarkHeightNew;
int xPosOfWm = 0;
int yPosOfWm = 0;
if (xPos > intDistance)
xPosOfWm = xPos - intDistance;
else
xPosOfWm = xPos;
if (yPos > intDistance)
yPosOfWm = yPos - intDistance;
else
yPosOfWm = yPos;
gWatermark.DrawImage(
imgWatermark
, new Rectangle(xPosOfWm, yPosOfWm, imgWatermarkWidthNew, imgWatermarkHeightNew)
, 0
, 0
, imgWatermarkWidth
, imgWatermarkHeight
, GraphicsUnit.Pixel
, imageAttributes
);
imgPhoto = bmWatermark;
//以jpg格式保存图片
imgPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg);
//销毁对象
gbmPhoto.Dispose();
gWatermark.Dispose();
imgPhoto.Dispose();
imgWatermark.Dispose();
return true;
}
catch
{
return false ;
}
}
/**//// <summary>
/// 文字水印
/// </summary>
/// <param name="ImgFile">原图文件地址</param>
/// <param name="TextFont">水印文字</param>
/// <param name="sImgPath">文字水印图片保存地址</param>
/// <param name="hScale">高度位置</param>
/// <param name="widthFont">文字块在图片中所占宽度比例</param>
/// <param name="Alpha">文字透明度 其数值的范围在0到255</param>
public bool zzsTextWater(
string ImgFile
, string TextFont
, string sImgPath
, float hScale
, float widthFont
, int Alpha
)
{
try
{
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;
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.DrawImage(
imgPhoto
, new Rectangle(0, 0, imgPhotoWidth, imgPhotoHeight)
, 0
, 0
, imgPhotoWidth
, imgPhotoHeight
, GraphicsUnit.Pixel
);
//建立字体大小的数组,循环找出适合图片的水印字体
//int[] sizes = new int[] { 1000, 800, 700, 650, 600, 560, 540, 500, 450, 400, 380, 360, 340, 320, 300, 280, 260, 240, 220, 200, 180, 160, 140, 120, 100, 80, 72, 64, 48, 32, 28, 26, 24, 20, 28, 16, 14, 12, 10, 8, 6, 4, 2 };
int[] sizes = new int[] { 28, 26, 24, 20, 16, 14, 12 };
System.Drawing.Font crFont = null;
System.Drawing.SizeF crSize = new SizeF();
for (int i = 0; i < 7; i++)
{
crFont = new Font("微软雅黑", sizes[i], FontStyle.Bold);
crSize = gbmPhoto.MeasureString(TextFont, crFont);
if ((ushort)crSize.Width < (ushort)imgPhotoWidth * widthFont)
break;
}
//设置水印字体的位置
//int yPixlesFromBottom = (int)(imgPhotoHeight * hScale);
//float yPosFromBottom = ((imgPhotoHeight - yPixlesFromBottom) - (crSize.Height / 2));
//float xCenterOfImg = (imgPhotoWidth * 1 / 2);
float yPosFromBottom = imgPhotoHeight *0.85f;
float xCenterOfImg = imgPhotoWidth * 0.8f;
//if (xCenterOfImg<crSize.Height)
// xCenterOfImg = (imgPhotoWidth * (1 - (crSize.Height)/ imgPhotoWidth));
System.Drawing.StringFormat StrFormat = new System.Drawing.StringFormat();
StrFormat.Alignment = System.Drawing.StringAlignment.Center;
//
System.Drawing.SolidBrush semiTransBrush2 = new System.Drawing.SolidBrush(Color.FromArgb(Alpha, 0, 0, 0));
gbmPhoto.DrawString(
TextFont
, crFont
, semiTransBrush2
, new System.Drawing.PointF(xCenterOfImg + 1, yPosFromBottom + 1)
, StrFormat
);
System.Drawing.SolidBrush semiTransBrush = new System.Drawing.SolidBrush(Color.FromArgb(Alpha, 255, 255, 255));
//gbmPhoto.FillRectangle(semiTransBrush2, new RectangleF(new PointF(xCenterOfImg - crSize.Width / 2, yPosFromBottom - 4), crSize));
gbmPhoto.DrawString(
TextFont
, crFont
, semiTransBrush
, new System.Drawing.PointF(xCenterOfImg, yPosFromBottom)
, StrFormat
);
bmPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg);
gbmPhoto.Dispose();
imgPhoto.Dispose();
bmPhoto.Dispose();
return true;
}
catch
{
return false;
}
}
/**//// <summary>
/// 文字和Logo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="TextFont">水印文字信息</param>
/// <param name="sImgPath">生存水印图片后的保存地址</param>
/// <param name="ImgAlpha">水印图片的透明度</param>
/// <param name="imgiScale">水印图片在原图上的显示比例</param>
/// <param name="intimgDistance">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>
/// <param name="texthScale">水印文字高度位置,从图片底部开始计算，0－1</param>
/// <param name="textwidthFont">文字块在图片中所占宽度比例 0－1</param>
/// <param name="textAlpha">文字透明度 其数值的范围在0到255</param>
public void zzsImgTextWater(
string ImgFile
, string WaterImg
, string TextFont
, string sImgPath
, float ImgAlpha
, float imgiScale
, int intimgDistance
, float texthScale
, float textwidthFont
, int textAlpha
)
{
try
{
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;
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.DrawImage(
imgPhoto
, new Rectangle(0, 0, imgPhotoWidth, imgPhotoHeight)
, 0
, 0
, imgPhotoWidth
, imgPhotoHeight
, GraphicsUnit.Pixel
);
//建立字体大小的数组,循环找出适合图片的水印字体
int[] sizes = new int[] { 1000, 800, 700, 650, 600, 560, 540, 500, 450, 400, 380, 360, 340, 320, 300, 280, 260, 240, 220, 200, 180, 160, 140, 120, 100, 80, 72, 64, 48, 32, 28, 26, 24, 20, 28, 16, 14, 12, 10, 8, 6, 4, 2 };
System.Drawing.Font crFont = null;
System.Drawing.SizeF crSize = new SizeF();
for (int i = 0; i < 43; i++)
{
crFont = new Font("arial", sizes[i], FontStyle.Bold);
crSize = gbmPhoto.MeasureString(TextFont, crFont);
if ((ushort)crSize.Width < (ushort)imgPhotoWidth * textwidthFont)
break;
}
//设置水印字体的位置
int yPixlesFromBottom = (int)(imgPhotoHeight * texthScale);
float yPosFromBottom = ((imgPhotoHeight - yPixlesFromBottom) - (crSize.Height / 2));
float xCenterOfImg = (imgPhotoWidth * 1 / 2);
System.Drawing.StringFormat StrFormat = new System.Drawing.StringFormat();
StrFormat.Alignment = System.Drawing.StringAlignment.Center;
//
System.Drawing.SolidBrush semiTransBrush2 = new System.Drawing.SolidBrush(Color.FromArgb(textAlpha, 0, 0, 0));
gbmPhoto.DrawString(
TextFont
, crFont
, semiTransBrush2
, new System.Drawing.PointF(xCenterOfImg + 1, yPosFromBottom + 1)
, StrFormat
);
System.Drawing.SolidBrush semiTransBrush = new System.Drawing.SolidBrush(Color.FromArgb(textAlpha, 255, 255, 255));
gbmPhoto.DrawString(
TextFont
, crFont
, semiTransBrush
, new System.Drawing.PointF(xCenterOfImg, yPosFromBottom)
, StrFormat
);
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(imgiScale);
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 bmWatermark = new Bitmap(bmPhoto);
bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
Graphics gWatermark = Graphics.FromImage(bmWatermark);
//指定高质量显示水印图片质量
gWatermark.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
gWatermark.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
System.Drawing.Imaging.ImageAttributes imageAttributes = new System.Drawing.Imaging.ImageAttributes();
//设置两种颜色,达到合成效果
System.Drawing.Imaging.ColorMap colorMap = new System.Drawing.Imaging.ColorMap();
colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
System.Drawing.Imaging.ColorMap[] remapTable = { colorMap };
imageAttributes.SetRemapTable(remapTable, System.Drawing.Imaging.ColorAdjustType.Bitmap);
//用矩阵设置水印图片透明度
float[][] colorMatrixElements = {
new float[] {1.0f, 0.0f, 0.0f, 0.0f, 0.0f},
new float[] {0.0f, 1.0f, 0.0f, 0.0f, 0.0f},
new float[] {0.0f, 0.0f, 1.0f, 0.0f, 0.0f},
new float[] {0.0f, 0.0f, 0.0f, ImgAlpha, 0.0f},
new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f}
};
System.Drawing.Imaging.ColorMatrix wmColorMatrix = new System.Drawing.Imaging.ColorMatrix(colorMatrixElements);
imageAttributes.SetColorMatrix(wmColorMatrix, System.Drawing.Imaging.ColorMatrixFlag.Default, System.Drawing.Imaging.ColorAdjustType.Bitmap);
//确定水印边距
int xPos = imgPhotoWidth - imgWatermarkWidthNew;
int yPos = imgPhotoHeight - imgWatermarkHeightNew;
int xPosOfWm = 0;
int yPosOfWm = 0;
if (xPos > intimgDistance)
xPosOfWm = xPos - intimgDistance;
else
xPosOfWm = xPos;
if (yPos > intimgDistance)
yPosOfWm = yPos - intimgDistance;
else
yPosOfWm = yPos;
gWatermark.DrawImage(
imgWatermark
, new Rectangle(xPosOfWm, yPosOfWm, imgWatermarkWidthNew, imgWatermarkHeightNew)
, 0
, 0
, imgWatermarkWidth
, imgWatermarkHeight
, GraphicsUnit.Pixel
, imageAttributes
);
imgPhoto = bmWatermark;
//以jpg格式保存图片
imgPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg);
//销毁对象
gbmPhoto.Dispose();
gWatermark.Dispose();
bmPhoto.Dispose();
imgPhoto.Dispose();
imgWatermark.Dispose();
}
catch
{
}
}
/**//// <summary>
/// 缩略图
/// </summary>
/// <param name="ImgFile">原图文件地址</param>
/// <param name="sImgPath">缩略图保存地址</param>
/// <param name="ResizeWidth">缩略图宽度</param>
/// <param name="ResizeHeight">缩略图高度</param>
/// <param name="BgColor">缩略图背景颜色,注意,背景颜色只能指定KnownColor中的值,如blue,red,green等</param>
public bool zzsResizeImg( string ImgFile , string sImgPath , int ResizeWidth , int ResizeHeight , string BgColor )
{
try
{
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;
int startX = 0;
int StartY = 0;
int NewWidth = 0;
int NewHeight = 0;
if (imgPhotoWidth >= ResizeWidth && imgPhotoHeight >= ResizeHeight)
{
NewWidth = ResizeWidth;
NewHeight = Convert.ToInt32(imgPhotoHeight * Math.Round(Convert.ToDecimal(ResizeWidth) / Convert.ToDecimal(imgPhotoWidth), 10));
startX = 0;
StartY = (ResizeHeight - NewHeight) / 2;
}
if (ResizeWidth > imgPhotoWidth && ResizeHeight < imgPhotoHeight)
{
NewHeight = ResizeHeight;
NewWidth = Convert.ToInt32(imgPhotoWidth * Math.Round(Convert.ToDecimal(ResizeHeight) / Convert.ToDecimal(imgPhotoHeight), 10));
startX = (ResizeWidth - NewWidth) / 2;
StartY = 0;
}
if (ResizeWidth < imgPhotoWidth && ResizeHeight > imgPhotoHeight)
{
NewWidth = ResizeWidth;
NewHeight = Convert.ToInt32(imgPhotoHeight * Math.Round(Convert.ToDecimal(ResizeWidth) / Convert.ToDecimal(imgPhotoWidth), 10));
startX = 0;
StartY = (ResizeHeight - NewHeight) / 2;
}
if (imgPhotoWidth < ResizeWidth && imgPhotoHeight < ResizeHeight)
{
NewWidth = imgPhotoWidth;
NewHeight = imgPhotoHeight;
startX = (ResizeWidth - imgPhotoWidth) / 2;
StartY = (ResizeHeight - imgPhotoHeight) / 2;
}
//计算缩放图片尺寸
Bitmap bmPhoto = new Bitmap(ResizeWidth, ResizeHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
bmPhoto.SetResolution(72, 72);
Graphics gbmPhoto = Graphics.FromImage(bmPhoto);
gbmPhoto.Clear(Color.FromName(BgColor));
gbmPhoto.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
gbmPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
gbmPhoto.DrawImage(
imgPhoto
, new Rectangle(startX, StartY, NewWidth, NewHeight)
, new Rectangle(0, 0, imgPhotoWidth, imgPhotoHeight)
, GraphicsUnit.Pixel
);
bmPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg);
imgPhoto.Dispose();
gbmPhoto.Dispose();
bmPhoto.Dispose();
ms.Close();
return true;
}
catch
{
return false;
}
}
/**//// <summary>
/// 图片剪切
/// </summary>
/// <param name="ImgFile">原图文件地址</param>
/// <param name="sImgPath">缩略图保存地址</param>
/// <param name="PointX">剪切起始点 X坐标</param>
/// <param name="PointY">剪切起始点 Y坐标</param>
/// <param name="CutWidth">剪切宽度</param>
/// <param name="CutHeight">剪切高度</param>
public bool zzsCutImg(string ImgFile, string sImgPath, int PointX, int PointY, int CutWidth, int CutHeight)
{
FileStream fs = new FileStream(ImgFile, FileMode.Open);
BinaryReader br = new BinaryReader(fs);
try
{
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);
//此处只能用filestream，用 System.Drawing.Image则会报多过进程访问文件的错误，会锁定文件
Bitmap bmPhoto = new Bitmap(CutWidth, CutHeight, 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.DrawImage(
imgPhoto
, new Rectangle(0, 0, CutWidth, CutHeight)
, new Rectangle(PointX, PointY, CutHeight, CutHeight)
, GraphicsUnit.Pixel
);
bmPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg);
imgPhoto.Dispose();
gbmPhoto.Dispose();
bmPhoto.Dispose();
ms.Close();
return true;
}
catch
{
return false;
}
finally
{
}
}
}
希望本文所述对大家C#程序设计有所帮助。