/// <summary>
/// 在一张图片的指定位置处加入水印文字
/// </summary>
/// <param name="SourceImage">指定源图片的绝对路径</param>
/// <param name="Text">指定文本</param>
/// <param name="fontFamily">文本字体</param>
/// <param name="textPos">指定位置</param>
/// <param name="SaveImage">保存图片的绝对路径</param>
public static void GetWaterMarkTextImage(string SourceImage, string Text, string fontFamily, wmPosition textPos, string SaveImage)
{
// 创建一个对象用于操作需要加水印的源图片
System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(SourceImage);
// 获取该源图片的宽度和高度
int phWidth = imgPhoto.Width;
int phHeight = imgPhoto.Height;
// 创建一个BMP格式的空白图片(宽度和高度与源图片一致)
Bitmap bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);
// 设置该新建空白BMP图片的分辨率
bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
// 将该BMP图片设置成一个图形对象
Graphics grPhoto = Graphics.FromImage(bmPhoto);
// 设置生成图片的质量
grPhoto.SmoothingMode = SmoothingMode.AntiAlias;
// 将源图片加载至新建的BMP图片中
grPhoto.DrawImage(
imgPhoto, // Photo Image object
new Rectangle(0, 0, phWidth, phHeight), // Rectangle structure
0, // x-coordinate of the portion of the source image to draw.
0, // y-coordinate of the portion of the source image to draw.
phWidth, // Width of the portion of the source image to draw.
phHeight, // Height of the portion of the source image to draw.
GraphicsUnit.Pixel); // Units of measure
//------------------------------------------------------------
// 第一步：设置插入文本信息的相关属性
//------------------------------------------------------------
//-------------------------------------------------------
//to maximize the size of the Copyright message we will
//test multiple Font sizes to determine the largest posible
//font we can use for the width of the Photograph
//define an array of point sizes you would like to consider as possiblities
//-------------------------------------------------------
int[] sizes = new int[] { 16, 14, 12, 10, 8, 6, 4 };
Font crFont = null;
SizeF crSize = new SizeF();
//Loop through the defined sizes checking the length of the Copyright string
//If its length in pixles is less then the image width choose this Font size.
for (int i = 0; i < 7; i++)
{
//set a Font object to Arial (i)pt, Bold
crFont = new Font(fontFamily, sizes[i], FontStyle.Bold);
//Measure the Copyright string in this Font
crSize = grPhoto.MeasureString(Text, crFont);
if ((ushort)crSize.Width < (ushort)phWidth)
{
break;
}
}
//Since all photographs will have varying heights, determine a
//position 5% from the bottom of the image
int yPixlesFromBottom = (int)(phHeight * .05);
//Now that we have a point size use the Copyrights string height
//to determine a y-coordinate to draw the string of the photograph
float yPosFromBottom = ((phHeight - yPixlesFromBottom) - (crSize.Height / 2));
//Determine its x-coordinate by calculating the center of the width of the image
float xCenterOfImg = (phWidth / 2);
//Define the text layout by setting the text alignment to centered
StringFormat StrFormat = new StringFormat();
StrFormat.Alignment = StringAlignment.Center;
//------------------------------------------------------------
// 第二步：第一次绘制文本信息
//------------------------------------------------------------
// 设置字体的颜色和透明度 (透明度设置为153)
SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(153, 0, 0, 0));
// 绘制文本在图片中的指定位置
grPhoto.DrawString(
Text, // 文本信息
crFont, // 文本字体
semiTransBrush2, // 笔刷
new PointF(xCenterOfImg + 1, yPosFromBottom + 1), // 文本在图片中的位置
StrFormat); // 格式化文本
//------------------------------------------------------------
// 第三步：重新绘制一遍文本，使文本具有阴影效果
//------------------------------------------------------------
// 设置字体的颜色和透明度 (透明度设置为153)
SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(153, 255, 255, 255));
// 绘制文本在图片中的指定位置
grPhoto.DrawString(
Text, // 文本信息
crFont, // 文本字体
semiTransBrush, // 笔刷
new PointF(xCenterOfImg, yPosFromBottom), // 文本在图片中的位置
StrFormat); // 格式化文本
grPhoto.Dispose();
imgPhoto.Dispose();
imgPhoto = bmPhoto;
//------------------------------------------------------------
// 第四步：保存图片
//------------------------------------------------------------
imgPhoto.Save(SaveImage, ImageFormat.Jpeg);
// 释放使用中的资源
bmPhoto.Dispose();
imgPhoto.Dispose();
}
/// <summary>
/// 在一张图片的指定位置处加入一张具有水印效果的图片和一段文本
/// </summary>
/// <param name="SourceImage"></param>
/// <param name="WaterMarkImage"></param>
/// <param name="Text"></param>
/// <param name="fontFamily"></param>
/// <param name="wmPos"></param>
/// <param name="textPos"></param>
/// <param name="SaveImage"></param>
public static void GetWarterMarkPicTextImage(string SourceImage, string WaterMarkImage, string Text, string fontFamily, wmPosition wmPos, wmPosition textPos, string SaveImage)
{
// 创建一个对象用于操作需要加水印的源图片
System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(SourceImage);
// 获取该源图片的宽度和高度
int phWidth = imgPhoto.Width;
int phHeight = imgPhoto.Height;
// 创建一个BMP格式的空白图片(宽度和高度与源图片一致)
Bitmap bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);
// 设置该新建空白BMP图片的分辨率
bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
// 将该BMP图片设置成一个图形对象
Graphics grPhoto = Graphics.FromImage(bmPhoto);
// 设置生成图片的质量
grPhoto.SmoothingMode = SmoothingMode.AntiAlias;
// 将源图片加载至新建的BMP图片中
grPhoto.DrawImage(
imgPhoto, // Photo Image object
new Rectangle(0, 0, phWidth, phHeight), // Rectangle structure
0, // x-coordinate of the portion of the source image to draw.
0, // y-coordinate of the portion of the source image to draw.
phWidth, // Width of the portion of the source image to draw.
phHeight, // Height of the portion of the source image to draw.
GraphicsUnit.Pixel); // Units of measure
//------------------------------------------------------------
// 第一步：设置插入文本信息的相关属性
//------------------------------------------------------------
//-------------------------------------------------------
//to maximize the size of the Copyright message we will
//test multiple Font sizes to determine the largest posible
//font we can use for the width of the Photograph
//define an array of point sizes you would like to consider as possiblities
//-------------------------------------------------------
int[] sizes = new int[] { 16, 14, 12, 10, 8, 6, 4 };
Font crFont = null;
SizeF crSize = new SizeF();
//Loop through the defined sizes checking the length of the Copyright string
//If its length in pixles is less then the image width choose this Font size.
for (int i = 0; i < 7; i++)
{
//set a Font object to Arial (i)pt, Bold
crFont = new Font(fontFamily, sizes[i], FontStyle.Bold);
//Measure the Copyright string in this Font
crSize = grPhoto.MeasureString(Text, crFont);
if ((ushort)crSize.Width < (ushort)phWidth)
{
break;
}
}
//Since all photographs will have varying heights, determine a
//position 5% from the bottom of the image
int yPixlesFromBottom = (int)(phHeight * .05);
//Now that we have a point size use the Copyrights string height
//to determine a y-coordinate to draw the string of the photograph
float yPosFromBottom = ((phHeight - yPixlesFromBottom) - (crSize.Height / 2));
//Determine its x-coordinate by calculating the center of the width of the image
float xCenterOfImg = (phWidth / 2);
//Define the text layout by setting the text alignment to centered
StringFormat StrFormat = new StringFormat();
StrFormat.Alignment = StringAlignment.Center;
//------------------------------------------------------------
// 第二步：第一次绘制文本信息
//------------------------------------------------------------
// 设置字体的颜色和透明度 (透明度设置为153)
SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(100, 0, 0, 0));
// 绘制文本在图片中的指定位置
grPhoto.DrawString(
Text, // 文本信息
crFont, // 文本字体
semiTransBrush2, // 笔刷
new PointF(xCenterOfImg + 1, yPosFromBottom + 1), // 文本在图片中的位置
StrFormat); // 格式化文本
//------------------------------------------------------------
// 第三步：重新绘制一遍文本，使文本具有阴影效果
//------------------------------------------------------------
// 设置字体的颜色和透明度 (透明度设置为153)
SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(100, 255, 255, 255));
// 绘制文本在图片中的指定位置
grPhoto.DrawString(
Text, // 文本信息
crFont, // 文本字体
semiTransBrush, // 笔刷
new PointF(xCenterOfImg, yPosFromBottom), // 文本在图片中的位置
StrFormat); // 格式化文本
//------------------------------------------------------------
// 第四步： 插入水印图片
//------------------------------------------------------------
// 创建水印图片的 Image 对象
System.Drawing.Image imgWatermark = new Bitmap(WaterMarkImage);
// 获取水印图片的宽度和高度
int wmWidth = imgWatermark.Width;
int wmHeight = imgWatermark.Height;
//Create a Bitmap based on the previously modified photograph Bitmap
Bitmap bmWatermark = new Bitmap(bmPhoto);
bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
//Load this Bitmap into a new Graphic Object
Graphics grWatermark = Graphics.FromImage(bmWatermark);
//To achieve a transulcent watermark we will apply (2) color
//manipulations by defineing a ImageAttributes object and
//seting (2) of its properties.
ImageAttributes imageAttributes = new ImageAttributes();
//The first step in manipulating the watermark image is to replace
//the background color with one that is trasparent (Alpha=0, R=0, G=0, B=0)
//to do this we will use a Colormap and use this to define a RemapTable
ColorMap colorMap = new ColorMap();
//My watermark was defined with a background of 100% Green this will
//be the color we search for and replace with transparency
colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
ColorMap[] remapTable = { colorMap };
imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);
//The second color manipulation is used to change the opacity of the
//watermark. This is done by applying a 5x5 matrix that contains the
//coordinates for the RGBA space. By setting the 3rd row and 3rd column
//to 0.3f we achive a level of opacity
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, 0.3f, 0.0f },
new float[] { 0.0f, 0.0f, 0.0f, 0.0f, 1.0f }
};
ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements);
imageAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default,
ColorAdjustType.Bitmap);
//For this example we will place the watermark in the upper right
//hand corner of the photograph. offset down 10 pixels and to the
//left 10 pixles
int xPosOfWm = ((phWidth - wmWidth) - 10);
int yPosOfWm = 10;
grWatermark.DrawImage(imgWatermark,
new Rectangle(xPosOfWm, yPosOfWm, wmWidth, wmHeight), //Set the detination Position
0, // x-coordinate of the portion of the source image to draw.
0, // y-coordinate of the portion of the source image to draw.
wmWidth, // Watermark Width
wmHeight, // Watermark Height
GraphicsUnit.Pixel, // Unit of measurment
imageAttributes); //ImageAttributes Object
//Replace the original photgraphs bitmap with the new Bitmap
imgPhoto.Dispose();
imgPhoto = bmWatermark;
grPhoto.Dispose();
grWatermark.Dispose();
bmPhoto.Dispose();
//------------------------------------------------------------
// 第五步：保存图片
//------------------------------------------------------------
imgPhoto.Save(SaveImage, ImageFormat.Jpeg);
// 释放使用中的资源
imgPhoto.Dispose();
imgWatermark.Dispose();
bmWatermark.Dispose();
}
/// <summary>
/// 在一张图片的指定位置处加入一张具有水印效果的图片
/// </summary>
/// <param name="SourceImage">指定源图片的绝对路径</param>
/// <param name="WaterMarkImage">指定水印图片的绝对路径</param>
/// <param name="wmPos">指定位置</param>
/// <param name="SaveImage">保存图片的绝对路径</param>
public static void GetWaterMarkPicImage(string SourceImage, string WaterMarkImage, wmPosition wmPos, string SaveImage)
{
// 创建一个对象用于操作需要加水印的源图片
System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(SourceImage);
// 获取该源图片的宽度和高度
int phWidth = imgPhoto.Width;
int phHeight = imgPhoto.Height;
// 创建一个BMP格式的空白图片(宽度和高度与源图片一致)
Bitmap bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);
// 设置该新建空白BMP图片的分辨率
bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
// 将该BMP图片设置成一个图形对象
Graphics grPhoto = Graphics.FromImage(bmPhoto);
// 设置生成图片的质量
grPhoto.SmoothingMode = SmoothingMode.AntiAlias;
// 将源图片加载至新建的BMP图片中
grPhoto.DrawImage(
imgPhoto, // Photo Image object
new Rectangle(0, 0, phWidth, phHeight), // Rectangle structure
0, // x-coordinate of the portion of the source image to draw.
0, // y-coordinate of the portion of the source image to draw.
phWidth, // Width of the portion of the source image to draw.
phHeight, // Height of the portion of the source image to draw.
GraphicsUnit.Pixel); // Units of measure
// 创建水印图片的 Image 对象
System.Drawing.Image imgWatermark = new Bitmap(WaterMarkImage);
// 获取水印图片的宽度和高度
int wmWidth = imgWatermark.Width;
int wmHeight = imgWatermark.Height;
//------------------------------------------------------------
// 第一步： 插入水印图片
//------------------------------------------------------------
//Create a Bitmap based on the previously modified photograph Bitmap
Bitmap bmWatermark = new Bitmap(bmPhoto);
bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
//Load this Bitmap into a new Graphic Object
Graphics grWatermark = Graphics.FromImage(bmWatermark);
//To achieve a transulcent watermark we will apply (2) color
//manipulations by defineing a ImageAttributes object and
//seting (2) of its properties.
ImageAttributes imageAttributes = new ImageAttributes();
//The first step in manipulating the watermark image is to replace
//the background color with one that is trasparent (Alpha=0, R=0, G=0, B=0)
//to do this we will use a Colormap and use this to define a RemapTable
ColorMap colorMap = new ColorMap();
//My watermark was defined with a background of 100% Green this will
//be the color we search for and replace with transparency
colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
ColorMap[] remapTable = { colorMap };
imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);
//The second color manipulation is used to change the opacity of the
//watermark. This is done by applying a 5x5 matrix that contains the
//coordinates for the RGBA space. By setting the 3rd row and 3rd column
//to 0.3f we achive a level of opacity
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, 0.3f, 0.0f },
new float[] { 0.0f, 0.0f, 0.0f, 0.0f, 1.0f }
};
ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements);
imageAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default,
ColorAdjustType.Bitmap);
//For this example we will place the watermark in the upper right
//hand corner of the photograph. offset down 10 pixels and to the
//left 10 pixles
int xPosOfWm = ((phWidth - wmWidth) - 10);
int yPosOfWm = 10;
grWatermark.DrawImage(imgWatermark,
new Rectangle(xPosOfWm, yPosOfWm, wmWidth, wmHeight), //Set the detination Position
0, // x-coordinate of the portion of the source image to draw.
0, // y-coordinate of the portion of the source image to draw.
wmWidth, // Watermark Width
wmHeight, // Watermark Height
GraphicsUnit.Pixel, // Unit of measurment
imageAttributes); //ImageAttributes Object
//Replace the original photgraphs bitmap with the new Bitmap
imgPhoto.Dispose();
imgPhoto = bmWatermark;
grPhoto.Dispose();
grWatermark.Dispose();
bmPhoto.Dispose();
//------------------------------------------------------------
// 第三步：保存图片
//------------------------------------------------------------
imgPhoto.Save(SaveImage, ImageFormat.Jpeg);
// 释放使用中的资源
imgPhoto.Dispose();
imgWatermark.Dispose();
bmWatermark.Dispose();
}
/// <summary>
/// 在一张图片的指定位置处加入水印文字
/// </summary>
/// <param name="SourceImage">指定源图片的绝对路径</param>
/// <param name="Text">指定文本</param>
/// <param name="fontFamily">文本字体</param>
/// <param name="textPos">指定位置</param>
/// <param name="SaveImage">保存图片的绝对路径</param>
public static void GetWaterMarkTextImage(string SourceImage, string Text, string fontFamily, wmPosition textPos, string SaveImage)
{
// 创建一个对象用于操作需要加水印的源图片
System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(SourceImage);
// 获取该源图片的宽度和高度
int phWidth = imgPhoto.Width;
int phHeight = imgPhoto.Height;
// 创建一个BMP格式的空白图片(宽度和高度与源图片一致)
Bitmap bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);
// 设置该新建空白BMP图片的分辨率
bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
// 将该BMP图片设置成一个图形对象
Graphics grPhoto = Graphics.FromImage(bmPhoto);
// 设置生成图片的质量
grPhoto.SmoothingMode = SmoothingMode.AntiAlias;
// 将源图片加载至新建的BMP图片中
grPhoto.DrawImage(
imgPhoto, // Photo Image object
new Rectangle(0, 0, phWidth, phHeight), // Rectangle structure
0, // x-coordinate of the portion of the source image to draw.
0, // y-coordinate of the portion of the source image to draw.
phWidth, // Width of the portion of the source image to draw.
phHeight, // Height of the portion of the source image to draw.
GraphicsUnit.Pixel); // Units of measure
//------------------------------------------------------------
// 第一步：设置插入文本信息的相关属性
//------------------------------------------------------------
//-------------------------------------------------------
//to maximize the size of the Copyright message we will
//test multiple Font sizes to determine the largest posible
//font we can use for the width of the Photograph
//define an array of point sizes you would like to consider as possiblities
//-------------------------------------------------------
int[] sizes = new int[] { 16, 14, 12, 10, 8, 6, 4 };
Font crFont = null;
SizeF crSize = new SizeF();
//Loop through the defined sizes checking the length of the Copyright string
//If its length in pixles is less then the image width choose this Font size.
for (int i = 0; i < 7; i++)
{
//set a Font object to Arial (i)pt, Bold
crFont = new Font(fontFamily, sizes[i], FontStyle.Bold);
//Measure the Copyright string in this Font
crSize = grPhoto.MeasureString(Text, crFont);
if ((ushort)crSize.Width < (ushort)phWidth) break;
}
//Since all photographs will have varying heights, determine a
//position 5% from the bottom of the image
int yPixlesFromBottom = (int)(phHeight * .05);
//Now that we have a point size use the Copyrights string height
//to determine a y-coordinate to draw the string of the photograph
float yPosFromBottom = ((phHeight - yPixlesFromBottom) - (crSize.Height / 2));
//Determine its x-coordinate by calculating the center of the width of the image
float xCenterOfImg = (phWidth / 2);
//Define the text layout by setting the text alignment to centered
StringFormat StrFormat = new StringFormat();
StrFormat.Alignment = StringAlignment.Center;
//------------------------------------------------------------
// 第二步：第一次绘制文本信息
//------------------------------------------------------------
// 设置字体的颜色和透明度 (透明度设置为153)
SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(153, 0, 0, 0));
// 绘制文本在图片中的指定位置
grPhoto.DrawString(
Text, // 文本信息
crFont, // 文本字体
semiTransBrush2, // 笔刷
new PointF(xCenterOfImg + 1, yPosFromBottom + 1), // 文本在图片中的位置
StrFormat); // 格式化文本
//------------------------------------------------------------
// 第三步：重新绘制一遍文本，使文本具有阴影效果
//------------------------------------------------------------
// 设置字体的颜色和透明度 (透明度设置为153)
SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(153, 255, 255, 255));
// 绘制文本在图片中的指定位置
grPhoto.DrawString(
Text, // 文本信息
crFont, // 文本字体
semiTransBrush, // 笔刷
new PointF(xCenterOfImg, yPosFromBottom), // 文本在图片中的位置
StrFormat); // 格式化文本
grPhoto.Dispose();
imgPhoto.Dispose();
imgPhoto = bmPhoto;
//------------------------------------------------------------
// 第四步：保存图片
//------------------------------------------------------------
imgPhoto.Save(SaveImage, ImageFormat.Jpeg);
// 释放使用中的资源
bmPhoto.Dispose();
imgPhoto.Dispose();
}
/// <summary>
/// 在一张图片的指定位置处加入一张具有水印效果的图片和一段文本
/// </summary>
/// <param name="SourceImage"></param>
/// <param name="WaterMarkImage"></param>
/// <param name="Text"></param>
/// <param name="fontFamily"></param>
/// <param name="wmPos"></param>
/// <param name="textPos"></param>
/// <param name="SaveImage"></param>
public static void GetWarterMarkPicTextImage(string SourceImage, string WaterMarkImage, string Text, string fontFamily, wmPosition wmPos, wmPosition textPos, string SaveImage)
{
// 创建一个对象用于操作需要加水印的源图片
System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(SourceImage);
// 获取该源图片的宽度和高度
int phWidth = imgPhoto.Width;
int phHeight = imgPhoto.Height;
// 创建一个BMP格式的空白图片(宽度和高度与源图片一致)
Bitmap bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);
// 设置该新建空白BMP图片的分辨率
bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
// 将该BMP图片设置成一个图形对象
Graphics grPhoto = Graphics.FromImage(bmPhoto);
// 设置生成图片的质量
grPhoto.SmoothingMode = SmoothingMode.AntiAlias;
// 将源图片加载至新建的BMP图片中
grPhoto.DrawImage(
imgPhoto, // Photo Image object
new Rectangle(0, 0, phWidth, phHeight), // Rectangle structure
0, // x-coordinate of the portion of the source image to draw.
0, // y-coordinate of the portion of the source image to draw.
phWidth, // Width of the portion of the source image to draw.
phHeight, // Height of the portion of the source image to draw.
GraphicsUnit.Pixel); // Units of measure
//------------------------------------------------------------
// 第一步：设置插入文本信息的相关属性
//------------------------------------------------------------
//-------------------------------------------------------
//to maximize the size of the Copyright message we will
//test multiple Font sizes to determine the largest posible
//font we can use for the width of the Photograph
//define an array of point sizes you would like to consider as possiblities
//-------------------------------------------------------
int[] sizes = new int[] { 16, 14, 12, 10, 8, 6, 4 };
Font crFont = null;
SizeF crSize = new SizeF();
//Loop through the defined sizes checking the length of the Copyright string
//If its length in pixles is less then the image width choose this Font size.
for (int i = 0; i < 7; i++)
{
//set a Font object to Arial (i)pt, Bold
crFont = new Font(fontFamily, sizes[i], FontStyle.Bold);
//Measure the Copyright string in this Font
crSize = grPhoto.MeasureString(Text, crFont);
if ((ushort)crSize.Width < (ushort)phWidth) break;
}
//Since all photographs will have varying heights, determine a
//position 5% from the bottom of the image
int yPixlesFromBottom = (int)(phHeight * .05);
//Now that we have a point size use the Copyrights string height
//to determine a y-coordinate to draw the string of the photograph
float yPosFromBottom = ((phHeight - yPixlesFromBottom) - (crSize.Height / 2));
//Determine its x-coordinate by calculating the center of the width of the image
float xCenterOfImg = (phWidth / 2);
//Define the text layout by setting the text alignment to centered
StringFormat StrFormat = new StringFormat();
StrFormat.Alignment = StringAlignment.Center;
//------------------------------------------------------------
// 第二步：第一次绘制文本信息
//------------------------------------------------------------
// 设置字体的颜色和透明度 (透明度设置为153)
SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(100, 0, 0, 0));
// 绘制文本在图片中的指定位置
grPhoto.DrawString(
Text, // 文本信息
crFont, // 文本字体
semiTransBrush2, // 笔刷
new PointF(xCenterOfImg + 1, yPosFromBottom + 1), // 文本在图片中的位置
StrFormat); // 格式化文本
//------------------------------------------------------------
// 第三步：重新绘制一遍文本，使文本具有阴影效果
//------------------------------------------------------------
// 设置字体的颜色和透明度 (透明度设置为153)
SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(100, 255, 255, 255));
// 绘制文本在图片中的指定位置
grPhoto.DrawString(
Text, // 文本信息
crFont, // 文本字体
semiTransBrush, // 笔刷
new PointF(xCenterOfImg, yPosFromBottom), // 文本在图片中的位置
StrFormat); // 格式化文本
//------------------------------------------------------------
// 第四步： 插入水印图片
//------------------------------------------------------------
// 创建水印图片的 Image 对象
System.Drawing.Image imgWatermark = new Bitmap(WaterMarkImage);
// 获取水印图片的宽度和高度
int wmWidth = imgWatermark.Width;
int wmHeight = imgWatermark.Height;
//Create a Bitmap based on the previously modified photograph Bitmap
Bitmap bmWatermark = new Bitmap(bmPhoto);
bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
//Load this Bitmap into a new Graphic Object
Graphics grWatermark = Graphics.FromImage(bmWatermark);
//To achieve a transulcent watermark we will apply (2) color
//manipulations by defineing a ImageAttributes object and
//seting (2) of its properties.
ImageAttributes imageAttributes = new ImageAttributes();
//The first step in manipulating the watermark image is to replace
//the background color with one that is trasparent (Alpha=0, R=0, G=0, B=0)
//to do this we will use a Colormap and use this to define a RemapTable
ColorMap colorMap = new ColorMap();
//My watermark was defined with a background of 100% Green this will
//be the color we search for and replace with transparency
colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
ColorMap[] remapTable = { colorMap };
imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);
//The second color manipulation is used to change the opacity of the
//watermark. This is done by applying a 5x5 matrix that contains the
//coordinates for the RGBA space. By setting the 3rd row and 3rd column
//to 0.3f we achive a level of opacity
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, 0.3f, 0.0f},
new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f}
};
ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements);
imageAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default,
ColorAdjustType.Bitmap);
//For this example we will place the watermark in the upper right
//hand corner of the photograph. offset down 10 pixels and to the
//left 10 pixles
int xPosOfWm = ((phWidth - wmWidth) - 10);
int yPosOfWm = 10;
grWatermark.DrawImage(imgWatermark,
new Rectangle(xPosOfWm, yPosOfWm, wmWidth, wmHeight), //Set the detination Position
0, // x-coordinate of the portion of the source image to draw.
0, // y-coordinate of the portion of the source image to draw.
wmWidth, // Watermark Width
wmHeight, // Watermark Height
GraphicsUnit.Pixel, // Unit of measurment
imageAttributes); //ImageAttributes Object
//Replace the original photgraphs bitmap with the new Bitmap
imgPhoto.Dispose();
imgPhoto = bmWatermark;
grPhoto.Dispose();
grWatermark.Dispose();
bmPhoto.Dispose();
//------------------------------------------------------------
// 第五步：保存图片
//------------------------------------------------------------
imgPhoto.Save(SaveImage, ImageFormat.Jpeg);
// 释放使用中的资源
imgPhoto.Dispose();
imgWatermark.Dispose();
bmWatermark.Dispose();
}
/// <summary>
/// 在一张图片的指定位置处加入一张具有水印效果的图片
/// </summary>
/// <param name="SourceImage">指定源图片的绝对路径</param>
/// <param name="WaterMarkImage">指定水印图片的绝对路径</param>
/// <param name="wmPos">指定位置</param>
/// <param name="SaveImage">保存图片的绝对路径</param>
public static void GetWaterMarkPicImage(string SourceImage, string WaterMarkImage, wmPosition wmPos, string SaveImage)
{
// 创建一个对象用于操作需要加水印的源图片
System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(SourceImage);
// 获取该源图片的宽度和高度
int phWidth = imgPhoto.Width;
int phHeight = imgPhoto.Height;
// 创建一个BMP格式的空白图片(宽度和高度与源图片一致)
Bitmap bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);
// 设置该新建空白BMP图片的分辨率
bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
// 将该BMP图片设置成一个图形对象
Graphics grPhoto = Graphics.FromImage(bmPhoto);
// 设置生成图片的质量
grPhoto.SmoothingMode = SmoothingMode.AntiAlias;
// 将源图片加载至新建的BMP图片中
grPhoto.DrawImage(
imgPhoto, // Photo Image object
new Rectangle(0, 0, phWidth, phHeight), // Rectangle structure
0, // x-coordinate of the portion of the source image to draw.
0, // y-coordinate of the portion of the source image to draw.
phWidth, // Width of the portion of the source image to draw.
phHeight, // Height of the portion of the source image to draw.
GraphicsUnit.Pixel); // Units of measure
// 创建水印图片的 Image 对象
System.Drawing.Image imgWatermark = new Bitmap(WaterMarkImage);
// 获取水印图片的宽度和高度
int wmWidth = imgWatermark.Width;
int wmHeight = imgWatermark.Height;
//------------------------------------------------------------
// 第一步： 插入水印图片
//------------------------------------------------------------
//Create a Bitmap based on the previously modified photograph Bitmap
Bitmap bmWatermark = new Bitmap(bmPhoto);
bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
//Load this Bitmap into a new Graphic Object
Graphics grWatermark = Graphics.FromImage(bmWatermark);
//To achieve a transulcent watermark we will apply (2) color
//manipulations by defineing a ImageAttributes object and
//seting (2) of its properties.
ImageAttributes imageAttributes = new ImageAttributes();
//The first step in manipulating the watermark image is to replace
//the background color with one that is trasparent (Alpha=0, R=0, G=0, B=0)
//to do this we will use a Colormap and use this to define a RemapTable
ColorMap colorMap = new ColorMap();
//My watermark was defined with a background of 100% Green this will
//be the color we search for and replace with transparency
colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
ColorMap[] remapTable = { colorMap };
imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);
//The second color manipulation is used to change the opacity of the
//watermark. This is done by applying a 5x5 matrix that contains the
//coordinates for the RGBA space. By setting the 3rd row and 3rd column
//to 0.3f we achive a level of opacity
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, 0.3f, 0.0f},
new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f}
};
ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements);
imageAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default,
ColorAdjustType.Bitmap);
//For this example we will place the watermark in the upper right
//hand corner of the photograph. offset down 10 pixels and to the
//left 10 pixles
int xPosOfWm = ((phWidth - wmWidth) - 10);
int yPosOfWm = 10;
grWatermark.DrawImage(imgWatermark,
new Rectangle(xPosOfWm, yPosOfWm, wmWidth, wmHeight), //Set the detination Position
0, // x-coordinate of the portion of the source image to draw.
0, // y-coordinate of the portion of the source image to draw.
wmWidth, // Watermark Width
wmHeight, // Watermark Height
GraphicsUnit.Pixel, // Unit of measurment
imageAttributes); //ImageAttributes Object
//Replace the original photgraphs bitmap with the new Bitmap
imgPhoto.Dispose();
imgPhoto = bmWatermark;
grPhoto.Dispose();
grWatermark.Dispose();
bmPhoto.Dispose();
//------------------------------------------------------------
// 第三步：保存图片
//------------------------------------------------------------
imgPhoto.Save(SaveImage, ImageFormat.Jpeg);
// 释放使用中的资源
imgPhoto.Dispose();
imgWatermark.Dispose();
bmWatermark.Dispose();
}
