C#实现的添加水印图片/文字
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.IO;
/*
*
* 使用说明：
* 建议先定义一个WaterImage实例
* 然后利用实例的属性，去匹配需要进行操作的参数
* 然后定义一个WaterImageManager实例
* 利用WaterImageManager实例进行DrawImage（）印图片水印
* DrawWords（）印文字水印
*
*/
namespace Common.Utils
{
/// <summary>
/// 图片位置
/// </summary>
public enum ImagePosition
{
LeftTop, //左上
LeftBottom, //左下
RightTop, //右上
RigthBottom, //右下
TopMiddle, //顶部居中
BottomMiddle, //底部居中
Center //中心
}
/// <summary>
/// 字体集
/// </summary>
public enum FontFamilys
{
CUSTOM,
Arial,
Batang,
BatangChe,
Calibri,
Cambria,
Candara,
Consolas,
Ebrima,
Footlight_MT_Light,
Kalinga,
Kokila,
Mangal,
Symbol,
Times_New_Roman,
Webdings,
仿宋,
华文中宋,
华文仿宋,
华文宋体,
华文彩云,
华文新魏,
华文楷体,
华文琥珀,
华文细黑,
华文行楷,
华文隶书,
宋体,
幼圆,
微软雅黑,
新宋体,
方正姚体,
方正舒体,
楷体,
隶书,
黑体
}
/// <summary>
/// 水印图片的操作管理
/// </summary>
public class WaterImageManager
{
private int padding = 0;//内容间隔
private string targetPicName = "_mixture_pic";//默认生成图片的文件名字
private string targetPicPath = "";//默认生成图片的目录
private ImageFormat picFormat = ImageFormat.Png;//默认生成图片的格式
public int Padding { get; set; }
public string TargetPicName { get; set; }
public string TargetPicPath { get; set; }
public ImageFormat PicFormat { get; set; }
/// <summary>
/// 生成一个新的水印图片制作实例(默认)
/// </summary>
public WaterImageManager()
{
Padding = padding;
TargetPicName = targetPicName;
TargetPicPath = targetPicPath;
PicFormat = picFormat;
}
/// <summary>
/// 生成一个新的水印图片制作实例(有参)
/// </summary>
/// <param name="tragetPicName">生成合成图片的文件名称</param>
/// <param name="tragetPicPath">生成合成图片的文件路径</param>
/// <param name="padding">指定水印距离父容器边距</param>
/// <param name="picFormat">指定生成合成图片的图片格式</param>
public WaterImageManager(string targetPicName, string targetPicPath, int padding, ImageFormat picFormat)
{
this.Padding = padding;
this.TargetPicName = targetPicName;
this.TargetPicPath = targetPicPath.EndsWith(@"\") ? targetPicPath : targetPicPath + @"\";
this.PicFormat = picFormat;
}
/// <summary>
/// 合成图片
/// </summary>
/// <param name="sourcePictureName">源文件名(包括后缀)</param>
/// <param name="sourcePicturePath">源文件路径</param>
/// <param name="waterPictureName">水印文件名(包括后缀)</param>
/// <param name="waterPicturePath">水印文件路径</param>
/// <param name="alpha">透明度(0.1-1.0数值越小透明度越高)</param>
/// <param name="position">位置</param>
/// <returns>合成图片的完整路径</returns>
public string DrawImage(string sourcePictureName,
string sourcePicturePath,
string waterPictureName,
string waterPicturePath,
float alpha,
ImagePosition position)
{
//
// 判断参数是否有效
//
if (sourcePictureName == string.Empty || waterPictureName == string.Empty || alpha == 0.0 || sourcePicturePath == string.Empty || waterPicturePath == string.Empty)
{
return sourcePicturePath + sourcePictureName + "." + PicFormat.ToString().ToLower();
}
if (!sourcePicturePath.EndsWith(@"\"))
sourcePicturePath = sourcePicturePath + @"\";
if (!waterPicturePath.EndsWith(@"\"))
waterPicturePath = waterPicturePath + @"\";
//
// 源图片，水印图片全路径
//
string _sourcePictureName = sourcePicturePath + sourcePictureName;
string _waterPictureName = waterPicturePath + waterPictureName;
if (!File.Exists(_sourcePictureName))
throw new FileNotFoundException(_sourcePictureName + " file not found!");
if (!File.Exists(_waterPictureName))
throw new FileNotFoundException(_waterPictureName + " file not found!");
string fileSourceExtension = System.IO.Path.GetExtension(_sourcePictureName).ToLower();
string fileWaterExtension = System.IO.Path.GetExtension(_waterPictureName).ToLower();
//
// 判断文件是否存在,以及类型是否正确
//
if (System.IO.File.Exists(_sourcePictureName) == false ||
System.IO.File.Exists(_waterPictureName) == false || (
fileSourceExtension != ".gif" &&
fileSourceExtension != ".jpg" &&
fileSourceExtension != ".png") || (
fileWaterExtension != ".gif" &&
fileWaterExtension != ".jpg" &&
fileWaterExtension != ".png")
)
{
return sourcePicturePath + sourcePictureName + "." + PicFormat.ToString().ToLower();
}
//
// 目标图片名称及全路径
//
TargetPicPath = TargetPicPath.EndsWith(@"\") ? TargetPicPath : TargetPicPath + @"\";
string targetImage = TargetPicPath == string.Empty ?
_sourcePictureName.Replace(System.IO.Path.GetExtension(_sourcePictureName), "") + TargetPicName + "." + PicFormat.ToString().ToLower() :
TargetPicPath + TargetPicName + "." + PicFormat.ToString().ToLower();
//
// 将需要加上水印的图片装载到Image对象中
//
Image imgPhoto = Image.FromFile(_sourcePictureName);
//
// 确定其长宽
//
int phWidth = imgPhoto.Width;
int phHeight = imgPhoto.Height;
//
// 封装 GDI+ 位图，此位图由图形图像及其属性的像素数据组成。
//
Bitmap bmPhoto = new Bitmap(phWidth, phHeight, imgPhoto.PixelFormat);//phWidth, phHeight, PixelFormat.Format24bppRgb imgPhoto
//
// 设定分辨率
//
bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
//
// 定义一个绘图画面用来装载位图
//
Graphics grPhoto = Graphics.FromImage(bmPhoto);
//
//同样，由于水印是图片，我们也需要定义一个Image来装载它
//
Image imgWatermark = new Bitmap(_waterPictureName);
//
// 获取水印图片的高度和宽度
//
int wmWidth = imgWatermark.Width;
int wmHeight = imgWatermark.Height;
//SmoothingMode：指定是否将平滑处理（消除锯齿）应用于直线、曲线和已填充区域的边缘。
// 成员名称 说明
// AntiAlias 指定消除锯齿的呈现。
// Default 指定不消除锯齿。
// HighQuality 指定高质量、低速度呈现。
// HighSpeed 指定高速度、低质量呈现。
// Invalid 指定一个无效模式。
// None 指定不消除锯齿。
grPhoto.SmoothingMode = SmoothingMode.AntiAlias;
//
// 第一次描绘，将我们的底图描绘在绘图画面上
//
grPhoto.DrawImage(imgPhoto,
new Rectangle(0, 0, phWidth, phHeight),
0,
0,
phWidth,
phHeight,
GraphicsUnit.Pixel);
//
// 与底图一样，我们需要一个位图来装载水印图片。并设定其分辨率
//
Bitmap bmWatermark = new Bitmap(bmPhoto);
bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
//
// 继续，将水印图片装载到一个绘图画面grWatermark
//
Graphics grWatermark = Graphics.FromImage(bmWatermark);
//
//ImageAttributes 对象包含有关在呈现时如何操作位图和图元文件颜色的信息。
//
ImageAttributes imageAttributes = new ImageAttributes();
//
//Colormap: 定义转换颜色的映射
//
ColorMap colorMap = new ColorMap();
//
//我的水印图被定义成拥有绿色背景色的图片被替换成透明
//
colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
ColorMap[] remapTable = { colorMap };
imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);
float[][] colorMatrixElements = {
new float[] {1.0f, 0.0f, 0.0f, 0.0f, 0.0f}, //red红色
new float[] {0.0f, 1.0f, 0.0f, 0.0f, 0.0f}, //green绿色
new float[] {0.0f, 0.0f, 1.0f, 0.0f, 0.0f}, //blue蓝色
new float[] {0.0f, 0.0f, 0.0f, alpha, 0.0f},//透明度
new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f}};//
// ColorMatrix:定义包含 RGBA 空间坐标的 5 x 5 矩阵。
// ImageAttributes 类的若干方法通过使用颜色矩阵调整图像颜色。
ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements);
imageAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default,
ColorAdjustType.Bitmap);
//
//上面设置完颜色，下面开始设置位置
//
int xPosOfWm;
int yPosOfWm;
switch (position)
{
case ImagePosition.BottomMiddle:
xPosOfWm = (phWidth - wmWidth) / 2;
yPosOfWm = phHeight - wmHeight - Padding;
break;
case ImagePosition.Center:
xPosOfWm = (phWidth - wmWidth) / 2;
yPosOfWm = (phHeight - wmHeight) / 2;
break;
case ImagePosition.LeftBottom:
xPosOfWm = Padding;
yPosOfWm = phHeight - wmHeight - Padding;
break;
case ImagePosition.LeftTop:
xPosOfWm = Padding;
yPosOfWm = Padding;
break;
case ImagePosition.RightTop:
xPosOfWm = phWidth - wmWidth - Padding;
yPosOfWm = Padding;
break;
case ImagePosition.RigthBottom:
xPosOfWm = phWidth - wmWidth - Padding;
yPosOfWm = phHeight - wmHeight - Padding;
break;
case ImagePosition.TopMiddle:
xPosOfWm = (phWidth - wmWidth) / 2;
yPosOfWm = Padding;
break;
default:
xPosOfWm = Padding;
yPosOfWm = phHeight - wmHeight - Padding;
break;
}
imgPhoto.Dispose();//释放底图，解决图片保存时 “GDI+ 中发生一般性错误。”
// 第二次绘图，把水印印上去
//
grWatermark.DrawImage(imgWatermark,
new Rectangle(xPosOfWm,
yPosOfWm,
wmWidth,
wmHeight),
0,
0,
wmWidth,
wmHeight,
GraphicsUnit.Pixel,
imageAttributes);
imgPhoto = bmWatermark;
grPhoto.Dispose();
grWatermark.Dispose();
//
// 保存文件到服务器的文件夹里面
//
if (!System.IO.Directory.Exists(TargetPicPath))
System.IO.Directory.CreateDirectory(TargetPicPath);
try
{
imgPhoto.Save(targetImage, PicFormat);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
imgPhoto.Dispose();
imgWatermark.Dispose();
return TargetPicPath + TargetPicName + "." + PicFormat.ToString().ToLower();
}
/// <summary>
/// 在图片上添加水印文字
/// </summary>
/// <param name="sourcePicture">源图片文件名(包含后缀)</param>
/// <param name="waterWords">需要添加到图片上的文字</param>
/// <param name="alpha">透明度（取值区间(0.0,1.0]）</param>
/// <param name="position">位置</param>
/// <param name="PicturePath">文件路径</param>
/// <returns></returns>
public string DrawWords(string sourcePictureName,
string sourcePicturePath,
string waterWords,
float alpha,
FontFamilys fontFamily,
FontStyle style,
ImagePosition position)
{
//
// 判断参数是否有效
//
if (sourcePictureName == string.Empty || waterWords == string.Empty || alpha == 0.0 || sourcePicturePath == string.Empty)
{
return sourcePicturePath + sourcePictureName;
}
if (!sourcePicturePath.EndsWith(@"\"))
sourcePicturePath = sourcePicturePath + @"\";
//
// 源图片全路径
//
string _sourcePictureName = sourcePicturePath + sourcePictureName;
if (!File.Exists(_sourcePictureName))
throw new FileNotFoundException(_sourcePictureName + " file not found!");
string fileExtension = System.IO.Path.GetExtension(_sourcePictureName).ToLower();
//
// 判断文件是否存在,以及文件名是否正确
//
if (System.IO.File.Exists(_sourcePictureName) == false || (
fileExtension != ".gif" &&
fileExtension != ".jpg" &&
fileExtension != ".png"))
{
return sourcePicturePath + sourcePictureName;
}
//
// 目标图片名称及全路径
//
string targetImage = TargetPicPath == string.Empty ?
_sourcePictureName.Replace(System.IO.Path.GetExtension(_sourcePictureName), "") + TargetPicName + "." + PicFormat.ToString().ToLower() :
TargetPicPath + TargetPicName + "." + PicFormat.ToString().ToLower();
//创建一个图片对象用来装载要被添加水印的图片
Image imgPhoto = Image.FromFile(_sourcePictureName);
//获取图片的宽和高
int phWidth = imgPhoto.Width;
int phHeight = imgPhoto.Height;
//
//建立一个bitmap，和我们需要加水印的图片一样大小
Bitmap bmPhoto = new Bitmap(phWidth, phHeight, imgPhoto.PixelFormat);
//SetResolution：设置此 Bitmap 的分辨率
//这里直接将我们需要添加水印的图片的分辨率赋给了bitmap
bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
//Graphics：封装一个 GDI+ 绘图图面。
Graphics grPhoto = Graphics.FromImage(bmPhoto);
//设置图形的品质
grPhoto.SmoothingMode = SmoothingMode.AntiAlias;
//将我们要添加水印的图片按照原始大小描绘（复制）到图形中
grPhoto.DrawImage(
imgPhoto, // 要添加水印的图片
new Rectangle(0, 0, phWidth, phHeight), // 根据要添加的水印图片的宽和高
0, // X方向从0点开始描绘
0, // Y方向
phWidth, // X方向描绘长度
phHeight, // Y方向描绘长度
GraphicsUnit.Pixel); // 描绘的单位，这里用的是像素
//根据图片的大小我们来确定添加上去的文字的大小
//在这里我们定义一个数组来确定
int[] sizes = new int[] { 16, 14, 12, 10, 8, 6, 4, 2 };
//字体
Font crFont = null;
//矩形的宽度和高度，SizeF有三个属性，分别为Height高，width宽，IsEmpty是否为空
SizeF crSize = new SizeF();
//利用一个循环语句来选择我们要添加文字的型号
//直到它的长度比图片的宽度小
for (int i = 0; i < 8; i++)
{
crFont = new Font(fontFamily.ToString(), sizes[i], style);
//测量用指定的 Font 对象绘制并用指定的 StringFormat 对象格式化的指定字符串。
crSize = grPhoto.MeasureString(waterWords, crFont);
// ushort 关键字表示一种整数数据类型
if ((ushort)crSize.Width < (ushort)phWidth)
break;
}
//截边5%的距离，定义文字显示(由于不同的图片显示的高和宽不同，所以按百分比截取)
int yPixlesFromBottom = (int)(phHeight * .05);
//定义在图片上文字的位置
float wmHeight = crSize.Height;
float wmWidth = crSize.Width;
float xPosOfWm;
float yPosOfWm;
switch (position)
{
case ImagePosition.BottomMiddle:
xPosOfWm = phWidth / 2;
yPosOfWm = phHeight - wmHeight - Padding;
break;
case ImagePosition.Center:
xPosOfWm = phWidth / 2;
yPosOfWm = phHeight / 2;
break;
case ImagePosition.RigthBottom:
xPosOfWm = phWidth / 2 + wmWidth / 2;
yPosOfWm = phHeight - wmHeight - Padding;
break;
case ImagePosition.RightTop:
xPosOfWm = phWidth / 2 + wmWidth / 2;
yPosOfWm = wmHeight / 2 + Padding;
break;
case ImagePosition.LeftTop:
xPosOfWm = wmWidth / 2 + Padding;
yPosOfWm = wmHeight / 2 + Padding;
break;
case ImagePosition.LeftBottom:
xPosOfWm = wmWidth / 2 + Padding;
yPosOfWm = phHeight - wmHeight - Padding;
break;
case ImagePosition.TopMiddle:
xPosOfWm = phWidth / 2;
yPosOfWm = wmHeight / 2 + Padding;
break;
default:
xPosOfWm = wmWidth;
yPosOfWm = phHeight - wmHeight - Padding;
break;
}
imgPhoto.Dispose();//释放底图，解决图片保存时 “GDI+ 中发生一般性错误。”
//封装文本布局信息（如对齐、文字方向和 Tab 停靠位），显示操作（如省略号插入和国家标准 (National) 数字替换）和 OpenType 功能。
StringFormat StrFormat = new StringFormat();
//定义需要印的文字居中对齐
StrFormat.Alignment = StringAlignment.Center;
//SolidBrush:定义单色画笔。画笔用于填充图形形状，如矩形、椭圆、扇形、多边形和封闭路径。
//这个画笔为描绘阴影的画笔，呈灰色
int m_alpha = Convert.ToInt32(255 * alpha);
SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(m_alpha, 0, 0, 0));
//描绘文字信息，这个图层向右和向下偏移一个像素，表示阴影效果
//DrawString 在指定矩形并且用指定的 Brush 和 Font 对象绘制指定的文本字符串。
grPhoto.DrawString(waterWords, //string of text
crFont, //font
semiTransBrush2, //Brush
new PointF(xPosOfWm + 1, yPosOfWm + 1), //Position
StrFormat);
//从四个 ARGB 分量（alpha、红色、绿色和蓝色）值创建 Color 结构，这里设置透明度为153
//这个画笔为描绘正式文字的笔刷，呈白色
SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(153, 255, 255, 255));
//第二次绘制这个图形，建立在第一次描绘的基础上
grPhoto.DrawString(waterWords, //string of text
crFont, //font
semiTransBrush, //Brush
new PointF(xPosOfWm, yPosOfWm), //Position
StrFormat);
//imgPhoto是我们建立的用来装载最终图形的Image对象
//bmPhoto是我们用来制作图形的容器，为Bitmap对象
imgPhoto = bmPhoto;
//释放资源，将定义的Graphics实例grPhoto释放，grPhoto功德圆满
grPhoto.Dispose();
//将grPhoto保存
if (!System.IO.Directory.Exists(TargetPicPath))
System.IO.Directory.CreateDirectory(TargetPicPath);
try
{
imgPhoto.Save(targetImage, PicFormat);
}
catch(Exception e)
{
Console.WriteLine(e.Message);
}
imgPhoto.Dispose();
return TargetPicPath + TargetPicName + "." + PicFormat.ToString().ToLower();
}
/// 无损压缩图片
/// <param name="sFile">原图片</param>
/// <param name="dFile">压缩后保存位置</param>
/// <param name="dHeight">高度</param>
/// <param name="dWidth">宽度</param>
/// <param name="flag">压缩质量(数字越小压缩率越高) 1-100</param>
/// <returns></returns>
public bool GetPicThumbnail(string sFile, string dFile, int dHeight, int dWidth, int flag)
{
System.Drawing.Image iSource = System.Drawing.Image.FromFile(sFile);
ImageFormat tFormat = iSource.RawFormat;
int sW = 0, sH = 0;
//按比例缩放
Size tem_size = new Size(iSource.Width, iSource.Height);
if (tem_size.Width > dHeight || tem_size.Width > dWidth)
{
if ((tem_size.Width * dHeight) > (tem_size.Width * dWidth))
{
sW = dWidth;
sH = (dWidth * tem_size.Height) / tem_size.Width;
}
else
{
sH = dHeight;
sW = (tem_size.Width * dHeight) / tem_size.Height;
}
}
else
{
sW = tem_size.Width;
sH = tem_size.Height;
}
Bitmap ob = new Bitmap(dWidth, dHeight);
Graphics g = Graphics.FromImage(ob);
g.Clear(Color.WhiteSmoke);
g.CompositingQuality = CompositingQuality.HighQuality;
g.SmoothingMode = SmoothingMode.HighQuality;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.DrawImage(iSource, new Rectangle((dWidth - sW) / 2, (dHeight - sH) / 2, sW, sH), 0, 0, iSource.Width, iSource.Height, GraphicsUnit.Pixel);
g.Dispose();
//以下代码为保存图片时，设置压缩质量
EncoderParameters ep = new EncoderParameters();
long[] qy = new long[1];
qy[0] = flag;//设置压缩的比例1-100
EncoderParameter eParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qy);
ep.Param[0] = eParam;
try
{
ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();
ImageCodecInfo jpegICIinfo = null;
for (int x = 0; x < arrayICI.Length; x++)
{
if (arrayICI[x].FormatDescription.Equals("JPEG"))
{
jpegICIinfo = arrayICI[x];
break;
}
}
if (jpegICIinfo != null)
{
ob.Save(dFile, jpegICIinfo, ep);//dFile是压缩后的新路径
}
else
{
ob.Save(dFile, tFormat);
}
return true;
}
catch(Exception e)
{
Console.WriteLine(e.Message);
return false;
}
finally
{
iSource.Dispose();
ob.Dispose();
}
}
}
/// <summary>
/// 装载水印图片的相关信息
/// </summary>
public class WaterImage
{
public WaterImage()
{
}
private string m_sourcePicture;
/// <summary>
/// 源图片地址名字(带后缀)
/// </summary>
public string SourcePicture
{
get { return m_sourcePicture; }
set { m_sourcePicture = value; }
}
private string m_waterImager;
/// <summary>
/// 水印图片名字(带后缀)
/// </summary>
public string WaterPicture
{
get { return m_waterImager; }
set { m_waterImager = value; }
}
private float m_alpha;
/// <summary>
/// 水印图片文字的透明度
/// </summary>
public float Alpha
{
get { return m_alpha; }
set { m_alpha = value; }
}
private ImagePosition m_postition;
/// <summary>
/// 水印图片或文字在图片中的位置
/// </summary>
public ImagePosition Position
{
get { return m_postition; }
set { m_postition = value; }
}
private string m_words;
/// <summary>
/// 水印文字的内容
/// </summary>
public string Words
{
get { return m_words; }
set { m_words = value; }
}
}
}
使用方式参考：
var parntImg = @"icon.png";
var waterImg = @"sup_icon.png";
var saveImg = @"C:\Users\luzhenyu\Desktop\test\";
WaterImageManage manage = new WaterImageManage("", "", 0, ImageFormat.Png);
var temp = manage.DrawImage(parntImg, saveImg, waterImg, saveImg, 1.0f, ImagePosition.TopMiddle);//水印图片
var temp = manage.DrawWords(parntImg, saveImg, "我爱你", 0.5f, FontFamilys.黑体, FontStyle.Regular, ImagePosition.TopMiddle);//水印文字
manage.GetPicThumbnail(saveImg + "icon.png", saveImg + "hahahaha.png", 48, 48, 100);//无损压缩图片
【欢迎上码】
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