各式各样的图片缩略水印静态类

各种各式各样的图片缩略水印静态，注释写的不多
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using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Text.RegularExpressions;
namespace Steam.Core
{
public static class ImageDeal
{
/// <summary>
        /// 缩略图，按高度和宽度来缩略
        ///http://www.cnblogs.com/pooeo/
        /// </summary>
        /// <param name="image"></param>
        /// <param name="size"></param>
        /// <returns></returns>
        public static Image Scale(Image image, Size size)
{
return image.GetThumbnailImage(size.Width, size.Height, null, new IntPtr());
}
/// <summary>
        /// 缩略图，按倍数来缩略
        ///http://www.cnblogs.com/pooeo/
        /// </summary>
        /// <param name="image">原图</param>
        /// <param name="multiple">放大或缩小的倍数，负数表示缩小，正数表示放大</param>
        /// <returns></returns>
        public static Image Scale(Image image, Int32 multiple)
{
Int32 newWidth;
Int32 newHeight;
Int32 absMultiple = Math.Abs(multiple);
if (multiple == 0)
{
return image.Clone() as Image;
}
if (multiple < 0)
{
newWidth = image.Width / absMultiple;
newHeight = image.Height / absMultiple;
}
else
{
newWidth = image.Width * absMultiple;
newHeight = image.Height * absMultiple;
}
return image.GetThumbnailImage(newWidth, newHeight, null, new IntPtr());
}
/// <summary>
        /// 固定宽度缩略
        ///http://www.cnblogs.com/pooeo/
        /// </summary>
        /// <param name="image"></param>
        /// <param name="width"></param>
        /// <returns></returns>
        public static Image ScaleFixWidth(Image image, Int32 width)
{
Int32 newWidth = width;
Int32 newHeight;
Double tempMultiple = (Double) newWidth / (Double) image.Width;
newHeight = (Int32) (((Double) image.Height) * tempMultiple);
Image newImage = new Bitmap(newWidth, newHeight);
using (Graphics newGp = Graphics.FromImage(newImage))
{
newGp.CompositingQuality = CompositingQuality.HighQuality;
//设置高质量插值法
                newGp.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
//设置高质量,低速度呈现平滑程度
                newGp.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//清空画布并以透明背景色填充
                newGp.Clear(Color.Transparent);
newGp.DrawImage(image, new Rectangle(0, 0, newWidth, newHeight));
}
return newImage;
}
/// <summary>
        /// 固定高度缩略
        ///http://www.cnblogs.com/pooeo/
        /// </summary>
        /// <param name="image"></param>
        /// <param name="height"></param>
        /// <returns></returns>
        public static Image ScaleFixHeight(Image image, Int32 height)
{
Int32 newWidth;
Int32 newHeight = height;
Double tempMultiple = (Double) newHeight / (Double) image.Height;
newWidth = (Int32) (((Double) image.Width) * tempMultiple);
Image newImage = new Bitmap(newWidth, newHeight);
using (Graphics newGp = Graphics.FromImage(newImage))
{
newGp.CompositingQuality = CompositingQuality.HighQuality;
//设置高质量插值法
                newGp.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
//设置高质量,低速度呈现平滑程度
                newGp.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//清空画布并以透明背景色填充
                newGp.Clear(Color.Transparent);
newGp.DrawImage(image, new Rectangle(0, 0, newWidth, newHeight));
}
return newImage;
}
/// <summary>
        /// 裁减缩略，根据固定的高度和宽度
        ///http://www.cnblogs.com/pooeo/
        /// </summary>
        /// <param name="image"></param>
        /// <param name="width"></param>
        /// <param name="heigth"></param>
        /// <returns></returns>
        public static Image ScaleCut(Image image, Int32 width, Int32 height)
{
int x = 0;
int y = 0;
int ow = image.Width;
int oh = image.Height;
if (width >= ow && height >= oh)
{
return image;
}
//如果结果要比原来的宽
            if (width > ow)
{
width = ow;
}
if (height > oh)
{
height = oh;
}
if ((double) image.Width / (double) image.Height > (double) width / (double) height)
{
oh = image.Height;
ow = image.Height * width / height;
y = 0;
x = (image.Width - ow) / 2;
}
else
{
ow = image.Width;
oh = image.Width * height / width;
x = 0;
y = (image.Height - oh) / 2;
}
Image newImage = new Bitmap(width, height);
using (Graphics newGp = Graphics.FromImage(newImage))
{
newGp.CompositingQuality = CompositingQuality.HighQuality;
//设置高质量插值法
                newGp.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
//设置高质量,低速度呈现平滑程度
                newGp.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//清空画布并以透明背景色填充
                newGp.Clear(Color.Transparent);
newGp.DrawImage(image, new Rectangle(0, 0, width, height),
new Rectangle(x, y, ow, oh),
GraphicsUnit.Pixel);
}
return newImage;
}
/// <summary>
        /// 生成缩略图
        ///http://www.cnblogs.com/pooeo/
        /// </summary>
        /// <param name="originalImagePath">源图路径（物理路径）</param>
        /// <param name="thumbnailPath">缩略图路径（物理路径）</param>
        /// <param name="width">缩略图宽度</param>
        /// <param name="height">缩略图高度</param>
        /// <param name="mode">生成缩略图的方式</param>
        public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
{
Image originalImage = Image.FromFile(originalImagePath);
int towidth = width;
int toheight = height;
int x = 0;
int y = 0;
int ow = originalImage.Width;
int oh = originalImage.Height;
switch (mode)
{
case "HW"://指定高宽缩放（可能变形）
                break;
case "W"://指定宽，高按比例
                toheight = originalImage.Height * width / originalImage.Width;
break;
case "H"://指定高，宽按比例
                towidth = originalImage.Width * height / originalImage.Height;
break;
case "Cut"://指定高宽裁减（不变形）
                if ((double) originalImage.Width / (double) originalImage.Height > (double) towidth / (double) toheight)
{
oh = originalImage.Height;
ow = originalImage.Height * towidth / toheight;
y = 0;
x = (originalImage.Width - ow) / 2;
}
else
{
ow = originalImage.Width;
oh = originalImage.Width * height / towidth;
x = 0;
y = (originalImage.Height - oh) / 2;
}
break;
default:
break;
}
//新建一个bmp图片
            Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
//新建一个画板
            Graphics g = System.Drawing.Graphics.FromImage(bitmap);
//设置高质量插值法
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
//设置高质量,低速度呈现平滑程度
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//清空画布并以透明背景色填充
            g.Clear(Color.Transparent);
//在指定位置并且按指定大小绘制原图片的指定部分
            g.DrawImage(originalImage, new Rectangle(0, 0, towidth, toheight),
new Rectangle(x, y, ow, oh),
GraphicsUnit.Pixel);
try
{
//以jpg格式保存缩略图
                bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch (System.Exception e)
{
throw e;
}
finally
{
originalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
}
/// <summary>
        /// 打水印，在某一点
        ///http://www.cnblogs.com/pooeo/
        /// </summary>
        /// <param name="image"></param>
        /// <param name="waterImagePath"></param>
        /// <param name="p"></param>
        public static void Makewater(Image image, String waterImagePath, Point p)
{
ImageDeal.Makewater(image, waterImagePath, p, ImagePosition.TopLeft);
}
public static void Makewater(Image image, String waterImagePath, Point p, ImagePosition imagePosition)
{
using (Image warterImage = Image.FromFile(waterImagePath))
{
using (Graphics newGp = Graphics.FromImage(image))
{
newGp.CompositingQuality = CompositingQuality.HighQuality;
//设置高质量插值法
                    newGp.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
//设置高质量,低速度呈现平滑程度
                    newGp.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
switch (imagePosition)
{
case ImagePosition.BottomLeft:
p.Y = image.Height - warterImage.Height - p.Y;
break;
case ImagePosition.TopRigth:
p.X = image.Width - warterImage.Width - p.X;
break;
case ImagePosition.BottomRight:
p.Y = image.Height - warterImage.Height - p.Y;
p.X = image.Width - warterImage.Width - p.X;
break;
}
newGp.DrawImage(warterImage, new Rectangle(p, new Size(warterImage.Width, warterImage.Height)));
}
}
}
public static void Makewater(Image image, String waterStr, Font font, Brush brush, Point p)
{
ImageDeal.Makewater(image, waterStr, font, brush, p, ImagePosition.TopLeft);
}
public static void Makewater(Image image, String waterStr, Font font, Brush brush, Point p, ImagePosition imagePosition)
{
using (Graphics newGp = Graphics.FromImage(image))
{
Int32 stringWidth;
Int32 stringHeight;
stringHeight = (int) font.Size;
stringWidth = (int) (((float) StringDeal.GetBitLength(waterStr) / (float) 2) * (font.Size + 1));
newGp.CompositingQuality = CompositingQuality.HighQuality;
//设置高质量插值法
                newGp.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
//设置高质量,低速度呈现平滑程度
                newGp.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//文字抗锯齿
                newGp.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
switch (imagePosition)
{
case ImagePosition.BottomLeft:
p.Y = image.Height - stringHeight - p.Y;
break;
case ImagePosition.TopRigth:
p.X = image.Width - stringWidth - p.X;
break;
case ImagePosition.BottomRight:
p.Y = image.Height - stringHeight - p.Y;
p.X = image.Width - stringWidth - p.X;
break;
}
newGp.DrawString(waterStr, font, brush, p);
}
}
/// <summary>
        /// 高质量保存
        ///http://www.cnblogs.com/pooeo/
        /// </summary>
        /// <param name="image"></param>
        /// <param name="path"></param>
        public static void SaveQuality(Image image, String path)
{
ImageCodecInfo myImageCodecInfo;
Encoder myEncoder;
EncoderParameter myEncoderParameter;
EncoderParameters myEncoderParameters;
myImageCodecInfo = ImageCodecInfo.GetImageEncoders()[0];
myEncoder = Encoder.Quality;
myEncoderParameters = new EncoderParameters(1);
myEncoderParameter = new EncoderParameter(myEncoder, 100L); // 0-100
            myEncoderParameters.Param[0] = myEncoderParameter;
try
{
image.Save(path, myImageCodecInfo, myEncoderParameters);
}
finally
{
myEncoderParameter.Dispose();
myEncoderParameters.Dispose();
}
}
}
//当字符串中有中文时，一个中文的长度表示为2
    //如 StringDeal.GetBitLength("123")没有中文返回的长度是3
    //如 StringDeal.GetBigLength("123四")有中文返回的长度是5，如果直接用"123四".Length返回的是4
    public static class StringDeal
{
public static int GetBitLength(string waterStr)
{
Regex regex = new Regex("["u4e00-"u9fa5]+");
int length = waterStr.Length;
for (int i = 0; i < waterStr.Length; i++)
{
if (regex.IsMatch(waterStr.Substring(i, 1)))
{
length++;
}
}
return length;
}
}
public enum StringPosition
{
TopLeft,
BottomLeft
}
public enum ImagePosition
{
TopLeft,
BottomLeft,
BottomRight,
TopRigth
}
}
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原文地址：https://www.cnblogs.com/lzhdim/p/1368863.html