C#图片处理基本应用(裁剪,缩放,清晰度,水印)(转)
using System; |
using System.Collections.Generic; |
using System.Text; |
using System.IO; |
using System.Drawing; |
using System.Drawing.Drawing2D; |
using System.Drawing.Imaging; |
|
namespace WuJian.Common |
{ |
/// <summary> |
/// 图片处理类 |
/// 吴剑 2008-07-02 创建 |
/// 吴剑 2011-01-21 修改 |
/// </summary> |
public class PTImage |
{ |
#region 正方型裁剪并缩放 |
/// <summary> |
/// 正方型裁剪 |
/// 以图片中心为轴心，截取正方型，然后等比缩放 |
/// 用于头像处理 |
/// </summary> |
/// <remarks>吴剑 2010-11-23</remarks> |
/// <param name="postedFile">原图HttpPostedFile对象</param> |
/// <param name="fileSaveUrl">缩略图存放地址</param> |
/// <param name="side">指定的边长（正方型）</param> |
/// <param name="quality">质量（范围0-100）</param> |
public static void CutForSquare(System.Web.HttpPostedFile postedFile, string fileSaveUrl, int side, int quality) |
{ |
//创建目录 |
string dir = Path.GetDirectoryName(fileSaveUrl); |
if (!Directory.Exists(dir)) |
Directory.CreateDirectory(dir); |
|
//原始图片（获取原始图片创建对象，并使用流中嵌入的颜色管理信息） |
System.Drawing.Image initImage = System.Drawing.Image.FromStream(postedFile.InputStream, true); |
|
//原图宽高均小于模版，不作处理，直接保存 |
if (initImage.Width <= side && initImage.Height <= side) |
{ |
initImage.Save(fileSaveUrl, System.Drawing.Imaging.ImageFormat.Jpeg); |
} |
else |
{ |
//原始图片的宽、高 |
int initWidth = initImage.Width; |
int initHeight = initImage.Height; |
|
//非正方型先裁剪为正方型 |
if (initWidth != initHeight) |
{ |
//截图对象 |
System.Drawing.Image pickedImage = null; |
System.Drawing.Graphics pickedG = null; |
|
//宽大于高的横图 |
if (initWidth > initHeight) |
{ |
//对象实例化 |
pickedImage = new System.Drawing.Bitmap(initHeight, initHeight); |
pickedG = System.Drawing.Graphics.FromImage(pickedImage); |
//设置质量 |
pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; |
pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; |
//定位 |
Rectangle fromR = new Rectangle((initWidth - initHeight) / 2, 0, initHeight, initHeight); |
Rectangle toR = new Rectangle(0, 0, initHeight, initHeight); |
//画图 |
pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel); |
//重置宽 |
initWidth = initHeight; |
} |
//高大于宽的竖图 |
else |
{ |
//对象实例化 |
pickedImage = new System.Drawing.Bitmap(initWidth, initWidth); |
pickedG = System.Drawing.Graphics.FromImage(pickedImage); |
//设置质量 |
pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; |
pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; |
//定位 |
Rectangle fromR = new Rectangle(0, (initHeight - initWidth) / 2, initWidth, initWidth); |
Rectangle toR = new Rectangle(0, 0, initWidth, initWidth); |
//画图 |
pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel); |
//重置高 |
initHeight = initWidth; |
} |
|
//将截图对象赋给原图 |
initImage = (System.Drawing.Image)pickedImage.Clone(); |
//释放截图资源 |
pickedG.Dispose(); |
pickedImage.Dispose(); |
} |
|
//缩略图对象 |
System.Drawing.Image resultImage = new System.Drawing.Bitmap(side, side); |
System.Drawing.Graphics resultG = System.Drawing.Graphics.FromImage(resultImage); |
//设置质量 |
resultG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; |
resultG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; |
//用指定背景色清空画布 |
resultG.Clear(Color.White); |
//绘制缩略图 |
resultG.DrawImage(initImage, new System.Drawing.Rectangle(0, 0, side, side), new System.Drawing.Rectangle(0, 0, initWidth, initHeight), System.Drawing.GraphicsUnit.Pixel); |
|
//关键质量控制 |
//获取系统编码类型数组,包含了jpeg,bmp,png,gif,tiff |
ImageCodecInfo[] icis = ImageCodecInfo.GetImageEncoders(); |
ImageCodecInfo ici = null; |
foreach (ImageCodecInfo i in icis) |
{ |
if (i.MimeType == "image/jpeg" || i.MimeType == "image/bmp" || i.MimeType == "image/png" || i.MimeType == "image/gif") |
{ |
ici = i; |
} |
} |
EncoderParameters ep = new EncoderParameters(1); |
ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)quality); |
|
//保存缩略图 |
resultImage.Save(fileSaveUrl, ici, ep); |
|
//释放关键质量控制所用资源 |
ep.Dispose(); |
|
//释放缩略图资源 |
resultG.Dispose(); |
resultImage.Dispose(); |
|
//释放原始图片资源 |
initImage.Dispose(); |
} |
} |
|
/// <summary> |
/// 正方型裁剪 |
/// 以图片中心为轴心，截取正方型，然后等比缩放 |
/// 用于头像处理 |
/// </summary> |
/// <remarks>吴剑 2010-11-23</remarks> |
/// <param name="postedFile">原图HttpPostedFile对象</param> |
/// <param name="fileSaveUrl">缩略图存放地址</param> |
/// <param name="side">指定的边长（正方型）</param> |
/// <param name="quality">质量（范围0-100）</param> |
public static void CutForSquare(System.IO.Stream fromFile, string fileSaveUrl, int side, int quality) |
{ |
//创建目录 |
string dir = Path.GetDirectoryName(fileSaveUrl); |
if (!Directory.Exists(dir)) |
Directory.CreateDirectory(dir); |
|
//原始图片（获取原始图片创建对象，并使用流中嵌入的颜色管理信息） |
System.Drawing.Image initImage = System.Drawing.Image.FromStream(fromFile, true); |
|
//原图宽高均小于模版，不作处理，直接保存 |
if (initImage.Width <= side && initImage.Height <= side) |
{ |
initImage.Save(fileSaveUrl, System.Drawing.Imaging.ImageFormat.Jpeg); |
} |
else |
{ |
//原始图片的宽、高 |
int initWidth = initImage.Width; |
int initHeight = initImage.Height; |
|
//非正方型先裁剪为正方型 |
if (initWidth != initHeight) |
{ |
//截图对象 |
System.Drawing.Image pickedImage = null; |
System.Drawing.Graphics pickedG = null; |
|
//宽大于高的横图 |
if (initWidth > initHeight) |
{ |
//对象实例化 |
pickedImage = new System.Drawing.Bitmap(initHeight, initHeight); |
pickedG = System.Drawing.Graphics.FromImage(pickedImage); |
//设置质量 |
pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; |
pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; |
//定位 |
Rectangle fromR = new Rectangle((initWidth - initHeight) / 2, 0, initHeight, initHeight); |
Rectangle toR = new Rectangle(0, 0, initHeight, initHeight); |
//画图 |
pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel); |
//重置宽 |
initWidth = initHeight; |
} |
//高大于宽的竖图 |
else |
{ |
//对象实例化 |
pickedImage = new System.Drawing.Bitmap(initWidth, initWidth); |
pickedG = System.Drawing.Graphics.FromImage(pickedImage); |
//设置质量 |
pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; |
pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; |
//定位 |
Rectangle fromR = new Rectangle(0, (initHeight - initWidth) / 2, initWidth, initWidth); |
Rectangle toR = new Rectangle(0, 0, initWidth, initWidth); |
//画图 |
pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel); |
//重置高 |
initHeight = initWidth; |
} |
|
//将截图对象赋给原图 |
initImage = (System.Drawing.Image)pickedImage.Clone(); |
//释放截图资源 |
pickedG.Dispose(); |
pickedImage.Dispose(); |
} |
|
//缩略图对象 |
System.Drawing.Image resultImage = new System.Drawing.Bitmap(side, side); |
System.Drawing.Graphics resultG = System.Drawing.Graphics.FromImage(resultImage); |
//设置质量 |
resultG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; |
resultG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; |
//用指定背景色清空画布 |
resultG.Clear(Color.White); |
//绘制缩略图 |
resultG.DrawImage(initImage, new System.Drawing.Rectangle(0, 0, side, side), new System.Drawing.Rectangle(0, 0, initWidth, initHeight), System.Drawing.GraphicsUnit.Pixel); |
|
//关键质量控制 |
//获取系统编码类型数组,包含了jpeg,bmp,png,gif,tiff |
ImageCodecInfo[] icis = ImageCodecInfo.GetImageEncoders(); |
ImageCodecInfo ici = null; |
foreach (ImageCodecInfo i in icis) |
{ |
if (i.MimeType == "image/jpeg" || i.MimeType == "image/bmp" || i.MimeType == "image/png" || i.MimeType == "image/gif") |
{ |
ici = i; |
} |
} |
EncoderParameters ep = new EncoderParameters(1); |
ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)quality); |
|
//保存缩略图 |
resultImage.Save(fileSaveUrl, ici, ep); |
|
//释放关键质量控制所用资源 |
ep.Dispose(); |
|
//释放缩略图资源 |
resultG.Dispose(); |
resultImage.Dispose(); |
|
//释放原始图片资源 |
initImage.Dispose(); |
} |
} |
#endregion |
|
#region 固定模版裁剪并缩放 |
/// <summary> |
/// 指定长宽裁剪 |
/// 按模版比例最大范围的裁剪图片并缩放至模版尺寸 |
/// </summary> |
/// <remarks>吴剑 2010-11-15</remarks> |
/// <param name="postedFile">原图HttpPostedFile对象</param> |
/// <param name="fileSaveUrl">保存路径</param> |
/// <param name="maxWidth">最大宽(单位:px)</param> |
/// <param name="maxHeight">最大高(单位:px)</param> |
/// <param name="quality">质量（范围0-100）</param> |
public static void CutForCustom(System.Web.HttpPostedFile postedFile, string fileSaveUrl, int maxWidth, int maxHeight, int quality) |
{ |
//从文件获取原始图片，并使用流中嵌入的颜色管理信息 |
System.Drawing.Image initImage = System.Drawing.Image.FromStream(postedFile.InputStream, true); |
|
//原图宽高均小于模版，不作处理，直接保存 |
if (initImage.Width <= maxWidth && initImage.Height <= maxHeight) |
{ |
initImage.Save(fileSaveUrl, System.Drawing.Imaging.ImageFormat.Jpeg); |
} |
else |
{ |
//模版的宽高比例 |
double templateRate = (double)maxWidth / maxHeight; |
//原图片的宽高比例 |
double initRate = (double)initImage.Width / initImage.Height; |
|
//原图与模版比例相等，直接缩放 |
if (templateRate == initRate) |
{ |
//按模版大小生成最终图片 |
System.Drawing.Image templateImage = new System.Drawing.Bitmap(maxWidth, maxHeight); |
System.Drawing.Graphics templateG = System.Drawing.Graphics.FromImage(templateImage); |
templateG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; |
templateG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; |
templateG.Clear(Color.White); |
templateG.DrawImage(initImage, new System.Drawing.Rectangle(0, 0, maxWidth, maxHeight), new System.Drawing.Rectangle(0, 0, initImage.Width, initImage.Height), System.Drawing.GraphicsUnit.Pixel); |
templateImage.Save(fileSaveUrl, System.Drawing.Imaging.ImageFormat.Jpeg); |
} |
//原图与模版比例不等，裁剪后缩放 |
else |
{ |
//裁剪对象 |
System.Drawing.Image pickedImage = null; |
System.Drawing.Graphics pickedG = null; |
|
//定位 |
Rectangle fromR = new Rectangle(0, 0, 0, 0);//原图裁剪定位 |
Rectangle toR = new Rectangle(0, 0, 0, 0);//目标定位 |
|
//宽为标准进行裁剪 |
if (templateRate > initRate) |
{ |
//裁剪对象实例化 |
pickedImage = new System.Drawing.Bitmap(initImage.Width, (int)Math.Floor(initImage.Width / templateRate)); |
pickedG = System.Drawing.Graphics.FromImage(pickedImage); |
|
//裁剪源定位 |
fromR.X = 0; |
fromR.Y = (int)Math.Floor((initImage.Height - initImage.Width / templateRate) / 2); |
fromR.Width = initImage.Width; |
fromR.Height = (int)Math.Floor(initImage.Width / templateRate); |
|
//裁剪目标定位 |
toR.X = 0; |
toR.Y = 0; |
toR.Width = initImage.Width; |
toR.Height = (int)Math.Floor(initImage.Width / templateRate); |
} |
//高为标准进行裁剪 |
else |
{ |
pickedImage = new System.Drawing.Bitmap((int)Math.Floor(initImage.Height * templateRate), initImage.Height); |
pickedG = System.Drawing.Graphics.FromImage(pickedImage); |
|
fromR.X = (int)Math.Floor((initImage.Width - initImage.Height * templateRate) / 2); |
fromR.Y = 0; |
fromR.Width = (int)Math.Floor(initImage.Height * templateRate); |
fromR.Height = initImage.Height; |
|
toR.X = 0; |
toR.Y = 0; |
toR.Width = (int)Math.Floor(initImage.Height * templateRate); |
toR.Height = initImage.Height; |
} |
|
//设置质量 |
pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; |
pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; |
|
//裁剪 |
pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel); |
|
//按模版大小生成最终图片 |
System.Drawing.Image templateImage = new System.Drawing.Bitmap(maxWidth, maxHeight); |
System.Drawing.Graphics templateG = System.Drawing.Graphics.FromImage(templateImage); |
templateG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; |
templateG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; |
templateG.Clear(Color.White); |
templateG.DrawImage(pickedImage, new System.Drawing.Rectangle(0, 0, maxWidth, maxHeight), new System.Drawing.Rectangle(0, 0, pickedImage.Width, pickedImage.Height), System.Drawing.GraphicsUnit.Pixel); |
|
//关键质量控制 |
//获取系统编码类型数组,包含了jpeg,bmp,png,gif,tiff |
ImageCodecInfo[] icis = ImageCodecInfo.GetImageEncoders(); |
ImageCodecInfo ici = null; |
foreach (ImageCodecInfo i in icis) |
{ |
if (i.MimeType == "image/jpeg" || i.MimeType == "image/bmp" || i.MimeType == "image/png" || i.MimeType == "image/gif") |
{ |
ici = i; |
} |
} |
EncoderParameters ep = new EncoderParameters(1); |
ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)quality); |
|
//保存缩略图 |
templateImage.Save(fileSaveUrl, ici, ep); |
//templateImage.Save(fileSaveUrl, System.Drawing.Imaging.ImageFormat.Jpeg); |
|
//释放资源 |
templateG.Dispose(); |
templateImage.Dispose(); |
|
pickedG.Dispose(); |
pickedImage.Dispose(); |
} |
} |
|
//释放资源 |
initImage.Dispose(); |
} |
#endregion |
|
#region 等比缩放 |
/// <summary> |
/// 图片等比缩放 |
/// </summary> |
/// <remarks>吴剑 2011-01-21</remarks> |
/// <param name="postedFile">原图HttpPostedFile对象</param> |
/// <param name="savePath">缩略图存放地址</param> |
/// <param name="targetWidth">指定的最大宽度</param> |
/// <param name="targetHeight">指定的最大高度</param> |
/// <param name="watermarkText">水印文字(为""表示不使用水印)</param> |
/// <param name="watermarkImage">水印图片路径(为""表示不使用水印)</param> |
public static void ZoomAuto(System.Web.HttpPostedFile postedFile, string savePath, System.Double targetWidth, System.Double targetHeight, string watermarkText, string watermarkImage) |
{ |
//创建目录 |
string dir = Path.GetDirectoryName(savePath); |
if (!Directory.Exists(dir)) |
Directory.CreateDirectory(dir); |
|
//原始图片（获取原始图片创建对象，并使用流中嵌入的颜色管理信息） |
System.Drawing.Image initImage = System.Drawing.Image.FromStream(postedFile.InputStream, true); |
|
//原图宽高均小于模版，不作处理，直接保存 |
if (initImage.Width <= targetWidth && initImage.Height <= targetHeight) |
{ |
//文字水印 |
if (watermarkText != "") |
{ |
using (System.Drawing.Graphics gWater = System.Drawing.Graphics.FromImage(initImage)) |
{ |
System.Drawing.Font fontWater = new Font("黑体", 10); |
System.Drawing.Brush brushWater = new SolidBrush(Color.White); |
gWater.DrawString(watermarkText, fontWater, brushWater, 10, 10); |
gWater.Dispose(); |
} |
} |
|
//透明图片水印 |
if (watermarkImage != "") |
{ |
if (File.Exists(watermarkImage)) |
{ |
//获取水印图片 |
using (System.Drawing.Image wrImage = System.Drawing.Image.FromFile(watermarkImage)) |
{ |
//水印绘制条件：原始图片宽高均大于或等于水印图片 |
if (initImage.Width >= wrImage.Width && initImage.Height >= wrImage.Height) |
{ |
Graphics gWater = Graphics.FromImage(initImage); |
|
//透明属性 |
ImageAttributes imgAttributes = new ImageAttributes(); |
ColorMap colorMap = new ColorMap(); |
colorMap.OldColor = Color.FromArgb(255, 0, 255, 0); |
colorMap.NewColor = Color.FromArgb(0, 0, 0, 0); |
ColorMap[] remapTable = { colorMap }; |
imgAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap); |
|
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, 0.5f, 0.0f},//透明度:0.5 |
new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f} |
}; |
|
ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements); |
imgAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap); |
gWater.DrawImage(wrImage, new Rectangle(initImage.Width - wrImage.Width, initImage.Height - wrImage.Height, wrImage.Width, wrImage.Height), 0, 0, wrImage.Width, wrImage.Height, GraphicsUnit.Pixel, imgAttributes); |
|
gWater.Dispose(); |
} |
wrImage.Dispose(); |
} |
} |
} |
|
//保存 |
initImage.Save(savePath, System.Drawing.Imaging.ImageFormat.Jpeg); |
} |
else |
{ |
//缩略图宽、高计算 |
double newWidth = initImage.Width; |
double newHeight = initImage.Height; |
|
//宽大于高或宽等于高（横图或正方） |
if (initImage.Width > initImage.Height || initImage.Width == initImage.Height) |
{ |
//如果宽大于模版 |
if (initImage.Width > targetWidth) |
{ |
//宽按模版，高按比例缩放 |
newWidth = targetWidth; |
newHeight = initImage.Height * (targetWidth / initImage.Width); |
} |
} |
//高大于宽（竖图） |
else |
{ |
//如果高大于模版 |
if (initImage.Height > targetHeight) |
{ |
//高按模版，宽按比例缩放 |
newHeight = targetHeight; |
newWidth = initImage.Width * (targetHeight / initImage.Height); |
} |
} |
|
//生成新图 |
//新建一个bmp图片 |
System.Drawing.Image newImage = new System.Drawing.Bitmap((int)newWidth, (int)newHeight); |
//新建一个画板 |
System.Drawing.Graphics newG = System.Drawing.Graphics.FromImage(newImage); |
|
//设置质量 |
newG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; |
newG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; |
|
//置背景色 |
newG.Clear(Color.White); |
//画图 |
newG.DrawImage(initImage, new System.Drawing.Rectangle(0, 0, newImage.Width, newImage.Height), new System.Drawing.Rectangle(0, 0, initImage.Width, initImage.Height), System.Drawing.GraphicsUnit.Pixel); |
|
//文字水印 |
if (watermarkText != "") |
{ |
using (System.Drawing.Graphics gWater = System.Drawing.Graphics.FromImage(newImage)) |
{ |
System.Drawing.Font fontWater = new Font("宋体", 10); |
System.Drawing.Brush brushWater = new SolidBrush(Color.White); |
gWater.DrawString(watermarkText, fontWater, brushWater, 10, 10); |
gWater.Dispose(); |
} |
} |
|
//透明图片水印 |
if (watermarkImage != "") |
{ |
if (File.Exists(watermarkImage)) |
{ |
//获取水印图片 |
using (System.Drawing.Image wrImage = System.Drawing.Image.FromFile(watermarkImage)) |
{ |
//水印绘制条件：原始图片宽高均大于或等于水印图片 |
if (newImage.Width >= wrImage.Width && newImage.Height >= wrImage.Height) |
{ |
Graphics gWater = Graphics.FromImage(newImage); |
|
//透明属性 |
ImageAttributes imgAttributes = new ImageAttributes(); |
ColorMap colorMap = new ColorMap(); |
colorMap.OldColor = Color.FromArgb(255, 0, 255, 0); |
colorMap.NewColor = Color.FromArgb(0, 0, 0, 0); |
ColorMap[] remapTable = { colorMap }; |
imgAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap); |
|
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, 0.5f, 0.0f},//透明度:0.5 |
new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f} |
}; |
|
ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements); |
imgAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap); |
gWater.DrawImage(wrImage, new Rectangle(newImage.Width - wrImage.Width, newImage.Height - wrImage.Height, wrImage.Width, wrImage.Height), 0, 0, wrImage.Width, wrImage.Height, GraphicsUnit.Pixel, imgAttributes); |
gWater.Dispose(); |
} |
wrImage.Dispose(); |
} |
} |
} |
|
//保存缩略图 |
newImage.Save(savePath, System.Drawing.Imaging.ImageFormat.Jpeg); |
|
//释放资源 |
newG.Dispose(); |
newImage.Dispose(); |
initImage.Dispose(); |
} |
} |
|
#endregion |
|
#region 其它 |
/// <summary> |
/// 判断文件类型是否为WEB格式图片 |
/// (注：JPG,GIF,BMP,PNG) |
/// </summary> |
/// <param name="contentType">HttpPostedFile.ContentType</param> |
/// <returns></returns> |
public static bool IsWebImage(string contentType) |
{ |
if (contentType == "image/pjpeg" || contentType == "image/jpeg" || contentType == "image/gif" || contentType == "image/bmp" || contentType == "image/png") |
{ |
return true; |
} |
else |
{ |
return false; |
} |
} |
|
#endregion |
}//end class |
} |
