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using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.Drawing.Imaging;
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using System.IO;
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using System.Linq;
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using System.Text;
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namespace POSV.Utils
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{
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public class ImageUtils
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{
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#region 正方型裁剪并缩放
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/// <summary>
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/// 正方型裁剪
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/// 以图片中心为轴心，截取正方型，然后等比缩放
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/// 用于头像处理
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/// </summary>
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/// <remarks>吴剑 2012-08-08</remarks>
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/// <param name="fromFile">原图Stream对象</param>
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/// <param name="fileSaveUrl">缩略图存放地址</param>
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/// <param name="side">指定的边长（正方型）</param>
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/// <param name="quality">质量（范围0-100）</param>
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public static void CutForSquare(System.IO.Stream fromFile , string fileSaveUrl , int side , int quality)
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{
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//创建目录
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string dir = Path.GetDirectoryName(fileSaveUrl);
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if (!Directory.Exists(dir))
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Directory.CreateDirectory(dir);
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//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）
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System.Drawing.Image initImage = System.Drawing.Image.FromStream(fromFile , true);
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//原图宽高均小于模版，不作处理，直接保存
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if (initImage.Width <= side && initImage.Height <= side)
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{
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initImage.Save(fileSaveUrl , System.Drawing.Imaging.ImageFormat.Jpeg);
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}
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else
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{
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//原始图片的宽、高
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int initWidth = initImage.Width;
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int initHeight = initImage.Height;
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//非正方型先裁剪为正方型
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if (initWidth != initHeight)
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{
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//截图对象
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System.Drawing.Image pickedImage = null;
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System.Drawing.Graphics pickedG = null;
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//宽大于高的横图
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if (initWidth > initHeight)
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{
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//对象实例化
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pickedImage = new System.Drawing.Bitmap(initHeight , initHeight);
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pickedG = System.Drawing.Graphics.FromImage(pickedImage);
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//设置质量
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pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
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pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
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//定位
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Rectangle fromR = new Rectangle((initWidth - initHeight) / 2 , 0 , initHeight , initHeight);
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Rectangle toR = new Rectangle(0 , 0 , initHeight , initHeight);
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//画图
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pickedG.DrawImage(initImage , toR , fromR , System.Drawing.GraphicsUnit.Pixel);
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//重置宽
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initWidth = initHeight;
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}
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//高大于宽的竖图
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else
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{
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//对象实例化
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pickedImage = new System.Drawing.Bitmap(initWidth , initWidth);
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pickedG = System.Drawing.Graphics.FromImage(pickedImage);
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//设置质量
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pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
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pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
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//定位
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Rectangle fromR = new Rectangle(0 , (initHeight - initWidth) / 2 , initWidth , initWidth);
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Rectangle toR = new Rectangle(0 , 0 , initWidth , initWidth);
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//画图
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pickedG.DrawImage(initImage , toR , fromR , System.Drawing.GraphicsUnit.Pixel);
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//重置高
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initHeight = initWidth;
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}
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//将截图对象赋给原图
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initImage = (System.Drawing.Image)pickedImage.Clone();
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//释放截图资源
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pickedG.Dispose();
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pickedImage.Dispose();
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}
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//缩略图对象
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System.Drawing.Image resultImage = new System.Drawing.Bitmap(side , side);
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System.Drawing.Graphics resultG = System.Drawing.Graphics.FromImage(resultImage);
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//设置质量
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resultG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
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resultG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
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//用指定背景色清空画布
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resultG.Clear(Color.White);
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//绘制缩略图
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resultG.DrawImage(initImage , new System.Drawing.Rectangle(0 , 0 , side , side) , new System.Drawing.Rectangle(0 , 0 , initWidth , initHeight) , System.Drawing.GraphicsUnit.Pixel);
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//关键质量控制
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//获取系统编码类型数组,包含了jpeg,bmp,png,gif,tiff
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ImageCodecInfo[] icis = ImageCodecInfo.GetImageEncoders();
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ImageCodecInfo ici = null;
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foreach (ImageCodecInfo i in icis)
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{
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if (i.MimeType == "image/jpeg" || i.MimeType == "image/bmp" || i.MimeType == "image/png" || i.MimeType == "image/gif")
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{
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ici = i;
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}
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}
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EncoderParameters ep = new EncoderParameters(1);
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ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality , (long)quality);
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//保存缩略图
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resultImage.Save(fileSaveUrl , ici , ep);
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//释放关键质量控制所用资源
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ep.Dispose();
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//释放缩略图资源
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resultG.Dispose();
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resultImage.Dispose();
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//释放原始图片资源
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initImage.Dispose();
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}
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}
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#endregion
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#region 自定义裁剪并缩放
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/// <summary>
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/// 指定长宽裁剪
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/// 按模版比例最大范围的裁剪图片并缩放至模版尺寸
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/// </summary>
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/// <remarks>吴剑 2012-08-08</remarks>
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/// <param name="fromFile">原图Stream对象</param>
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/// <param name="fileSaveUrl">保存路径</param>
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/// <param name="maxWidth">最大宽(单位:px)</param>
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/// <param name="maxHeight">最大高(单位:px)</param>
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/// <param name="quality">质量（范围0-100）</param>
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public static void CutForCustom(System.IO.Stream fromFile , string fileSaveUrl , int maxWidth , int maxHeight , int quality)
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{
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//从文件获取原始图片，并使用流中嵌入的颜色管理信息
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System.Drawing.Image initImage = System.Drawing.Image.FromStream(fromFile , true);
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//原图宽高均小于模版，不作处理，直接保存
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if (initImage.Width <= maxWidth && initImage.Height <= maxHeight)
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{
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initImage.Save(fileSaveUrl , System.Drawing.Imaging.ImageFormat.Jpeg);
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}
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else
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{
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//模版的宽高比例
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double templateRate = (double)maxWidth / maxHeight;
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//原图片的宽高比例
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double initRate = (double)initImage.Width / initImage.Height;
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//原图与模版比例相等，直接缩放
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if (templateRate == initRate)
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{
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//按模版大小生成最终图片
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System.Drawing.Image templateImage = new System.Drawing.Bitmap(maxWidth , maxHeight);
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System.Drawing.Graphics templateG = System.Drawing.Graphics.FromImage(templateImage);
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templateG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
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templateG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
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templateG.Clear(Color.White);
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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);
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templateImage.Save(fileSaveUrl , System.Drawing.Imaging.ImageFormat.Jpeg);
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}
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//原图与模版比例不等，裁剪后缩放
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else
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{
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//裁剪对象
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System.Drawing.Image pickedImage = null;
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System.Drawing.Graphics pickedG = null;
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//定位
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Rectangle fromR = new Rectangle(0 , 0 , 0 , 0);//原图裁剪定位
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Rectangle toR = new Rectangle(0 , 0 , 0 , 0);//目标定位
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//宽为标准进行裁剪
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if (templateRate > initRate)
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{
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//裁剪对象实例化
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pickedImage = new System.Drawing.Bitmap(initImage.Width , (int)System.Math.Floor(initImage.Width / templateRate));
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pickedG = System.Drawing.Graphics.FromImage(pickedImage);
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//裁剪源定位
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fromR.X = 0;
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fromR.Y = (int)System.Math.Floor((initImage.Height - initImage.Width / templateRate) / 2);
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fromR.Width = initImage.Width;
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fromR.Height = (int)System.Math.Floor(initImage.Width / templateRate);
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//裁剪目标定位
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toR.X = 0;
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toR.Y = 0;
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toR.Width = initImage.Width;
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toR.Height = (int)System.Math.Floor(initImage.Width / templateRate);
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}
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//高为标准进行裁剪
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else
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{
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pickedImage = new System.Drawing.Bitmap((int)System.Math.Floor(initImage.Height * templateRate) , initImage.Height);
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pickedG = System.Drawing.Graphics.FromImage(pickedImage);
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fromR.X = (int)System.Math.Floor((initImage.Width - initImage.Height * templateRate) / 2);
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fromR.Y = 0;
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fromR.Width = (int)System.Math.Floor(initImage.Height * templateRate);
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fromR.Height = initImage.Height;
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toR.X = 0;
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toR.Y = 0;
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toR.Width = (int)System.Math.Floor(initImage.Height * templateRate);
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toR.Height = initImage.Height;
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}
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//设置质量
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pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
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pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
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//裁剪
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pickedG.DrawImage(initImage , toR , fromR , System.Drawing.GraphicsUnit.Pixel);
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//按模版大小生成最终图片
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System.Drawing.Image templateImage = new System.Drawing.Bitmap(maxWidth , maxHeight);
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System.Drawing.Graphics templateG = System.Drawing.Graphics.FromImage(templateImage);
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templateG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
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templateG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
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templateG.Clear(Color.White);
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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);
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//关键质量控制
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//获取系统编码类型数组,包含了jpeg,bmp,png,gif,tiff
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ImageCodecInfo[] icis = ImageCodecInfo.GetImageEncoders();
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ImageCodecInfo ici = null;
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foreach (ImageCodecInfo i in icis)
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{
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if (i.MimeType == "image/jpeg" || i.MimeType == "image/bmp" || i.MimeType == "image/png" || i.MimeType == "image/gif")
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{
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ici = i;
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}
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}
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EncoderParameters ep = new EncoderParameters(1);
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ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality , (long)quality);
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//保存缩略图
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templateImage.Save(fileSaveUrl , ici , ep);
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//templateImage.Save(fileSaveUrl, System.Drawing.Imaging.ImageFormat.Jpeg);
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//释放资源
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templateG.Dispose();
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templateImage.Dispose();
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pickedG.Dispose();
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pickedImage.Dispose();
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}
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}
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//释放资源
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initImage.Dispose();
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}
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#endregion
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#region 等比缩放
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/// <summary>
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/// 图片等比缩放
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/// </summary>
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/// <remarks>吴剑 2012-08-08</remarks>
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/// <param name="fromFile">原图Stream对象</param>
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/// <param name="savePath">缩略图存放地址</param>
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/// <param name="targetWidth">指定的最大宽度</param>
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/// <param name="targetHeight">指定的最大高度</param>
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/// <param name="watermarkText">水印文字(为""表示不使用水印)</param>
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/// <param name="watermarkImage">水印图片路径(为""表示不使用水印)</param>
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public static void ZoomAuto(System.IO.Stream fromFile , string savePath , System.Double targetWidth , System.Double targetHeight , string watermarkText , string watermarkImage)
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{
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//创建目录
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string dir = Path.GetDirectoryName(savePath);
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if (!Directory.Exists(dir))
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Directory.CreateDirectory(dir);
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//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）
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System.Drawing.Image initImage = System.Drawing.Image.FromStream(fromFile , true);
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//原图宽高均小于模版，不作处理，直接保存
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if (initImage.Width <= targetWidth && initImage.Height <= targetHeight)
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{
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//文字水印
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if (watermarkText != "")
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{
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using (System.Drawing.Graphics gWater = System.Drawing.Graphics.FromImage(initImage))
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{
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System.Drawing.Font fontWater = new Font("黑体" , 10);
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System.Drawing.Brush brushWater = new SolidBrush(Color.White);
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gWater.DrawString(watermarkText , fontWater , brushWater , 10 , 10);
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gWater.Dispose();
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}
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}
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//透明图片水印
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if (watermarkImage != "")
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{
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if (File.Exists(watermarkImage))
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{
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//获取水印图片
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using (System.Drawing.Image wrImage = System.Drawing.Image.FromFile(watermarkImage))
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{
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//水印绘制条件：原始图片宽高均大于或等于水印图片
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if (initImage.Width >= wrImage.Width && initImage.Height >= wrImage.Height)
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{
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Graphics gWater = Graphics.FromImage(initImage);
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//透明属性
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ImageAttributes imgAttributes = new ImageAttributes();
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ColorMap colorMap = new ColorMap();
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colorMap.OldColor = Color.FromArgb(255 , 0 , 255 , 0);
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colorMap.NewColor = Color.FromArgb(0 , 0 , 0 , 0);
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ColorMap[] remapTable = { colorMap };
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imgAttributes.SetRemapTable(remapTable , ColorAdjustType.Bitmap);
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float[][] colorMatrixElements = {
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new float[] {1.0f, 0.0f, 0.0f, 0.0f, 0.0f},
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new float[] {0.0f, 1.0f, 0.0f, 0.0f, 0.0f},
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new float[] {0.0f, 0.0f, 1.0f, 0.0f, 0.0f},
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new float[] {0.0f, 0.0f, 0.0f, 0.5f, 0.0f},//透明度:0.5
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new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f}
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};
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ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements);
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imgAttributes.SetColorMatrix(wmColorMatrix , ColorMatrixFlag.Default , ColorAdjustType.Bitmap);
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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);
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gWater.Dispose();
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|
}
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|
wrImage.Dispose();
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|
}
|
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|
|
}
|
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|
}
|
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|
//保存
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|
|
initImage.Save(savePath , System.Drawing.Imaging.ImageFormat.Jpeg);
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|
|
}
|
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|
else
|
|
|
|
|
|
{
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|
|
//缩略图宽、高计算
|
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|
|
double newWidth = initImage.Width;
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|
|
|
double newHeight = initImage.Height;
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|
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|
|
//宽大于高或宽等于高（横图或正方）
|
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|
|
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
|
|
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|
|
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
|
|
|
|
|
|
}
|
