图片编辑类
using
System;
using
System.Drawing;
using
System.IO;
/// <summary>
/// ImgEdit 的摘要说明
/// </summary>
public
class
ImgEdit
{ public ImgEdit()
{ // // TODO: 在此处添加构造函数逻辑 //
} /// <summary> /// 图片水印 /// </summary> /// <param name="ImgFile">原图文件地址</param> /// <param name="WaterImg">水印图片地址</param> /// <param name="sImgPath">水印图片保存地址</param> /// <param name="Alpha">水印透明度设置</param> /// <param name="iScale">水印图片在原图上的显示比例(水平)</param> /// <param name="intDistance">水印图片在原图上的边距确定,以图片的右边和下边为准,当设定的边距超过一定大小后参数会自动失效</param> public bool ImgWater(string ImgFile, string WaterImg, string sImgPath, float Alpha, float iScale, int intDistance) { try { //装载图片 FileStream fs = new FileStream(ImgFile, FileMode.Open); BinaryReader br = new BinaryReader(fs); byte[] bytes = br.ReadBytes((int)fs.Length); br.Close(); fs.Close(); MemoryStream ms = new MemoryStream(bytes); System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(ms); int imgPhotoWidth = imgPhoto.Width; int imgPhotoHeight = imgPhoto.Height; System.Drawing.Image imgWatermark = new Bitmap(WaterImg); int imgWatermarkWidth = imgWatermark.Width; int imgWatermarkHeight = imgWatermark.Height; //计算水印图片尺寸 decimal aScale = Convert.ToDecimal(iScale); decimal pScale = 0.05M; decimal MinScale = aScale - pScale; decimal MaxScale = aScale + pScale; //设置比例 int imgWatermarkWidthNew = Convert.ToInt32(imgPhotoWidth * aScale); int imgWatermarkHeightNew = Convert.ToInt32((imgPhotoWidth * aScale / imgWatermarkWidth) * imgWatermarkHeight); //将原图画出来 Bitmap bmPhoto = new Bitmap(imgPhotoWidth, imgPhotoHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb); bmPhoto.SetResolution(72, 72); Graphics gbmPhoto = Graphics.FromImage(bmPhoto); gbmPhoto.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; gbmPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; gbmPhoto.Clear(Color.White); gbmPhoto.DrawImage(imgPhoto, new Rectangle(0, 0, imgPhotoWidth, imgPhotoHeight), 0, 0, imgPhotoWidth, imgPhotoHeight, GraphicsUnit.Pixel); Bitmap bmWatermark = new Bitmap(bmPhoto); bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution); Graphics gWatermark = Graphics.FromImage(bmWatermark); //指定高质量显示水印图片质量 gWatermark.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; gWatermark.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; System.Drawing.Imaging.ImageAttributes imageAttributes = new System.Drawing.Imaging.ImageAttributes(); //设置两种颜色,达到合成效果 System.Drawing.Imaging.ColorMap colorMap = new System.Drawing.Imaging.ColorMap(); colorMap.OldColor = Color.FromArgb(255, 0, 255, 0); colorMap.NewColor = Color.FromArgb(0, 0, 0, 0); System.Drawing.Imaging.ColorMap[] remapTable = { colorMap }; imageAttributes.SetRemapTable(remapTable, System.Drawing.Imaging.ColorAdjustType.Bitmap); //用矩阵设置水印图片透明度 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, Alpha, 0.0f}, new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f} }; System.Drawing.Imaging.ColorMatrix wmColorMatrix = new System.Drawing.Imaging.ColorMatrix(colorMatrixElements); imageAttributes.SetColorMatrix(wmColorMatrix, System.Drawing.Imaging.ColorMatrixFlag.Default, System.Drawing.Imaging.ColorAdjustType.Bitmap); //确定水印边距 int xPos = imgPhotoWidth - imgWatermarkWidthNew; int yPos = imgPhotoHeight - imgWatermarkHeightNew; int xPosOfWm = 0; int yPosOfWm = 0; if (xPos > intDistance) xPosOfWm = xPos - intDistance; else xPosOfWm = xPos; if (yPos > intDistance) yPosOfWm = yPos - intDistance; else yPosOfWm = yPos; gWatermark.DrawImage(imgWatermark, new Rectangle(xPosOfWm, yPosOfWm, imgWatermarkWidthNew, imgWatermarkHeightNew), 0, 0, imgWatermarkWidth, imgWatermarkHeight, GraphicsUnit.Pixel, imageAttributes); imgPhoto = bmWatermark; imgPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg); //销毁对象 gbmPhoto.Dispose(); gWatermark.Dispose(); imgPhoto.Dispose(); imgWatermark.Dispose(); return true; } catch (Exception ex) { return false; } } /// <summary> /// 文字水印 /// </summary> /// <param name="ImgFile">原图文件地址</param> /// <param name="TextFont">水印文字</param> /// <param name="sImgPath">文字水印图片保存地址</param> /// <param name="Alpha">文字透明度 其数值的范围在0到255</param> /// <param name="widthFont">文字块在图片中所占宽度比例</param> /// <param name="hScale">高度位置</param> public bool TextWater(string ImgFile, string TextFont, string sImgPath, int Alpha, float widthFont, float hScale) { try { FileStream fs = new FileStream(ImgFile, FileMode.Open); BinaryReader br = new BinaryReader(fs); byte[] bytes = br.ReadBytes((int)fs.Length); br.Close(); fs.Close(); MemoryStream ms = new MemoryStream(bytes); System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(ms); int imgPhotoWidth = imgPhoto.Width; int imgPhotoHeight = imgPhoto.Height; Bitmap bmPhoto = new Bitmap(imgPhotoWidth, imgPhotoHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb); bmPhoto.SetResolution(72, 72); Graphics gbmPhoto = Graphics.FromImage(bmPhoto); gbmPhoto.Clear(Color.FromName("white"));//gif背景色 gbmPhoto.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; gbmPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; gbmPhoto.DrawImage(imgPhoto, new Rectangle(0, 0, imgPhotoWidth, imgPhotoHeight), 0, 0, imgPhotoWidth, imgPhotoHeight, GraphicsUnit.Pixel); //建立字体大小的数组,循环找出适合图片的水印字体 int[] sizes = new int[] { 1000, 800, 700, 650, 600, 560, 540, 500, 450, 400, 380, 360, 340, 320, 300, 280, 260, 240, 220, 200, 180, 160, 140, 120, 100, 80, 72, 64, 48, 32, 28, 26, 24, 20, 28, 16, 14, 12, 10, 8, 6, 4, 2 }; System.Drawing.Font crFont = null; System.Drawing.SizeF crSize = new SizeF(); for (int i = 0; i < 43; i++) { crFont = new Font("arial", sizes[i], FontStyle.Bold); crSize = gbmPhoto.MeasureString(TextFont, crFont); if ((ushort)crSize.Width < (ushort)imgPhotoWidth * widthFont) break; } //设置水印字体的位置 int yPixlesFromBottom = (int)(imgPhotoHeight * hScale); float yPosFromBottom = ((imgPhotoHeight - yPixlesFromBottom) - (crSize.Height / 2)); float xCenterOfImg = (imgPhotoWidth * 1 / 2); System.Drawing.StringFormat StrFormat = new System.Drawing.StringFormat(); StrFormat.Alignment = System.Drawing.StringAlignment.Center; //画两次制造透明效果 System.Drawing.SolidBrush semiTransBrush2 = new System.Drawing.SolidBrush(Color.FromArgb(Alpha, 0, 0, 0)); gbmPhoto.DrawString(TextFont, crFont, semiTransBrush2, new System.Drawing.PointF(xCenterOfImg + 1, yPosFromBottom + 1), StrFormat); System.Drawing.SolidBrush semiTransBrush = new System.Drawing.SolidBrush(Color.FromArgb(Alpha, 255, 255, 255)); gbmPhoto.DrawString(TextFont, crFont, semiTransBrush, new System.Drawing.PointF(xCenterOfImg, yPosFromBottom), StrFormat); bmPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg); gbmPhoto.Dispose(); imgPhoto.Dispose(); bmPhoto.Dispose(); return true; } catch (Exception ex) { return false; } } /// <summary> /// 缩略图 /// </summary> /// <param name="ImgFile">原图文件地址</param> /// <param name="sImgPath">缩略图保存地址</param> /// <param name="ResizeWidth">缩略图宽度</param> /// <param name="ResizeHeight">缩略图高度</param> /// <param name="BgColor">缩略图背景颜色,注意,背景颜色只能指定KnownColor中的值,如white,blue,red,green等</param> public bool ResizeImg(string ImgFile, string sImgPath, int ResizeWidth, int ResizeHeight, string BgColor) { try { FileStream fs = new FileStream(ImgFile, FileMode.Open); BinaryReader br = new BinaryReader(fs); byte[] bytes = br.ReadBytes((int)fs.Length); br.Close(); fs.Close(); MemoryStream ms = new MemoryStream(bytes); System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(ms); int imgPhotoWidth = imgPhoto.Width; int imgPhotoHeight = imgPhoto.Height; int StartX = 0; int StartY = 0; int NewWidth = imgPhotoWidth; int NewHeight = imgPhotoHeight; //计算缩放图片尺寸 if (NewWidth > ResizeWidth) { NewWidth = ResizeWidth; NewHeight = Convert.ToInt32(imgPhotoHeight * Math.Round(Convert.ToDecimal(NewWidth) / Convert.ToDecimal(imgPhotoWidth), 10)); } if (NewHeight > ResizeHeight) { NewHeight = ResizeHeight; NewWidth = Convert.ToInt32(imgPhotoWidth * Math.Round(Convert.ToDecimal(NewHeight) / Convert.ToDecimal(imgPhotoHeight), 10)); } StartX = ResizeWidth - NewWidth; StartY = ResizeHeight - NewHeight; StartX = StartX > 0 ? StartX / 2 : 0; StartY = StartY > 0 ? StartY / 2 : 0; Bitmap bmPhoto = new Bitmap(ResizeWidth, ResizeHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb); bmPhoto.SetResolution(72, 72); Graphics gbmPhoto = Graphics.FromImage(bmPhoto); gbmPhoto.Clear(Color.FromName(BgColor)); gbmPhoto.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; gbmPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; gbmPhoto.DrawImage(imgPhoto, new Rectangle(StartX, StartY, NewWidth, NewHeight), new Rectangle(0, 0, imgPhotoWidth, imgPhotoHeight), GraphicsUnit.Pixel); bmPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg); imgPhoto.Dispose(); gbmPhoto.Dispose(); bmPhoto.Dispose(); return true; } catch (Exception err) { return false; } } /// <summary> /// 图片剪切 /// </summary> /// <param name="ImgFile">原图文件地址</param> /// <param name="sImgPath">缩略图保存地址</param> /// <param name="PointX">剪切起始点 X坐标</param> /// <param name="PointY">剪切起始点 Y坐标</param> /// <param name="CutWidth">剪切宽度</param> /// <param name="CutHeight">剪切高度</param> public bool CutImg(string ImgFile, string sImgPath, int PointX, int PointY, int CutWidth, int CutHeight) { try { FileStream fs = new FileStream(ImgFile, FileMode.Open); BinaryReader br = new BinaryReader(fs); byte[] bytes = br.ReadBytes((int)fs.Length); br.Close(); fs.Close(); MemoryStream ms = new MemoryStream(bytes); System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(ms); //System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(ImgFile); //此处只能用filestream，用 System.Drawing.Image则会报多过进程访问文件的错误，会锁定文件 Bitmap bmPhoto = new Bitmap(CutWidth, CutHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb); bmPhoto.SetResolution(72, 72); Graphics gbmPhoto = Graphics.FromImage(bmPhoto); gbmPhoto.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; gbmPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; gbmPhoto.DrawImage(imgPhoto, new Rectangle(0, 0, CutWidth, CutHeight), new Rectangle(PointX, PointY, CutHeight, CutHeight), GraphicsUnit.Pixel); bmPhoto.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg); imgPhoto.Dispose(); gbmPhoto.Dispose(); bmPhoto.Dispose(); return true; } catch (Exception err) { return false; } }}
本文转自博客园cloudgamer的博客，原文链接：图片编辑类，如需转载请自行联系原博主。