图片处理C#

今天在CodeProject上找到这篇文章，还算实用，不敢独享，送给大家!
原文地址 示例下载 源码下载(VS2005)
简介 ... 概述 这篇文章的目的是构建一个图像处理功能的类而使每一个C#程序员都能够使用。因为使用C#能够非常灵活的进行图像处理。 我们知道，当基于计算来移动像素或改变像素值的代码稍微有点复杂。
应用
ImageHandler类负责图像处理的相关操作，如保存、图像关联操作等。功能包括：获取图片信息、 缩放、色彩滤镜、亮度、反向、灰度、转换、裁贴、和插入文字、其它图片或几何图形。 Paint方法使用AutoScoolPosition属性发现滚动位置，使用AutoScrollMinSize属性进行设置。
1.Color Filter(色相)   关于色相的说明: 　　从光学意义上讲，色相差别是由光波波长的长短产生的。即便是同一类颜色，也能分为几种色相，如黄颜色可以分为中黄、土黄、 柠檬黄等，灰颜色则可以分为红灰、蓝灰、紫灰等。光谱中有红、橙、黄、绿、蓝、紫六种基本色光，人的眼睛可以 分辨出约180种不同色相的颜色。 颜色过滤是依照颜色的光谱吸收类别：短波长、长波长、混合波长；合并或形状裁贴；单色或变色的。 详见：http://baike.baidu.com/view/122648.htm
这个比较简单，只需要增加或减少每种颜色的值即可。 使图片中的另外两种颜色值减去255即可。比如,红色相中，保持红色值不变，而对绿色和蓝色分别减去255即可。
        

C# code

///<summary>/// 设置色相 ///</summary>///<param name="colorFilterType">色相类型</param>publicvoid SetColorFilter(ColorFilterTypes colorFilterType) { Bitmap temp = (Bitmap)_currentBitmap; Bitmap bmap = (Bitmap)temp.Clone(); Color c; for (int i =0; i < bmap.Width; i++) { for (int j =0; j < bmap.Height; j++) { c = bmap.GetPixel(i, j); int nPixelR =0; int nPixelG =0; int nPixelB =0; if (colorFilterType == ColorFilterTypes.Red) { nPixelR = c.R; nPixelG = c.G -255; nPixelB = c.B -255; } elseif (colorFilterType == ColorFilterTypes.Green) { nPixelR = c.R -255; nPixelG = c.G; nPixelB = c.B -255; } elseif (colorFilterType == ColorFilterTypes.Blue) { nPixelR = c.R -255; nPixelG = c.G -255; nPixelB = c.B; } nPixelR = Math.Max(nPixelR, 0); nPixelR = Math.Min(255, nPixelR); nPixelG = Math.Max(nPixelG, 0); nPixelG = Math.Min(255, nPixelG); nPixelB = Math.Max(nPixelB, 0); nPixelB = Math.Min(255, nPixelB); bmap.SetPixel(i, j, Color.FromArgb((byte)nPixelR, (byte)nPixelG, (byte)nPixelB)); } } _currentBitmap = (Bitmap)bmap.Clone(); }

　　

2.Gamma(曲线) Gamma源于CRT（显示器/电视机）的响应曲线，即其亮度与输入电压的非线性关系。 Gamma 校正补偿了不同输出设备存在的颜色显示差异，从而使图像在不同的监视器上呈现出相同的效果。 详见 ：http://baike.baidu.com/view/476857.htm

C# code

///<summary>/// 曲线 ///</summary>///<param name="red">红</param>///<param name="green">绿</param>///<param name="blue">蓝</param>publicvoid SetGamma(double red, double green, double blue) { Bitmap temp = (Bitmap)_currentBitmap; Bitmap bmap = (Bitmap)temp.Clone(); Color c; byte[] redGamma = CreateGammaArray(red); byte[] greenGamma = CreateGammaArray(green); byte[] blueGamma = CreateGammaArray(blue); for (int i =0; i < bmap.Width; i++) { for (int j =0; j < bmap.Height; j++) { c = bmap.GetPixel(i, j); bmap.SetPixel(i, j, Color.FromArgb(redGamma[c.R], greenGamma[c.G], blueGamma[c.B])); } } _currentBitmap = (Bitmap)bmap.Clone(); } ///<summary>/// 获取曲线数组 ///</summary>///<param name="color">色彩</param>///<returns>数组</returns>privatebyte[] CreateGammaArray(double color) { byte[] gammaArray =newbyte[256]; for (int i =0; i <256; ++i) { gammaArray[i] = (byte)Math.Min(255, (int)((255.0* Math.Pow(i /255.0, 1.0/ color)) +0.5)); } return gammaArray; }

3. Brightness(亮度) 一种颜色的范围，表示它与一系列从很昏暗（黑）到很明亮（耀眼）的无色彩的颜色之间的相似处。 取值范围为-255到255之间。

C# code

///<summary>/// 设置亮度 ///</summary>///<param name="brightness">亮度,-255到+255之间的数值</param>publicvoid SetBrightness(int brightness) { Bitmap temp = (Bitmap)_currentBitmap; Bitmap bmap = (Bitmap)temp.Clone(); if (brightness <-255) brightness =-255; if (brightness >255) brightness =255; Color c; for (int i =0; i < bmap.Width; i++) { for (int j =0; j < bmap.Height; j++) { c = bmap.GetPixel(i, j); int cR = c.R + brightness; int cG = c.G + brightness; int cB = c.B + brightness; if (cR <0) cR =1; if (cR >255) cR =255; if (cG <0) cG =1; if (cG >255) cG =255; if (cB <0) cB =1; if (cB >255) cB =255; bmap.SetPixel(i, j, Color.FromArgb((byte)cR, (byte)cG, (byte)cB)); } } _currentBitmap = (Bitmap)bmap.Clone(); }

4.Contrast(对比度) 　　对比比率是屏幕上同一点最亮时（白色）与最暗时（黑色）的亮度的比值，高的对比度意味着相对较高的亮度和呈现颜色的艳丽程度。 　　品质优异的LCD显示器面板和优秀的背光源亮度，两者合理配合就能获得色彩饱满明亮清晰的画面。 http://www.codeproject.com/KB/GDI-plus/ImageProcessing2/img.jpg http://www.codeproject.com/KB/GDI-plus/ImageProcessing2/contrast.jpg

C# code

///<summary>/// 设置对比度 ///</summary>///<param name="contrast">对比度,-100到+100之间的数值</param>publicvoid SetContrast(double contrast) { Bitmap temp = (Bitmap)_currentBitmap; Bitmap bmap = (Bitmap)temp.Clone(); if (contrast <-100) contrast =-100; if (contrast >100) contrast =100; contrast = (100.0+ contrast) /100.0; contrast *= contrast; Color c; for (int i =0; i < bmap.Width; i++) { for (int j =0; j < bmap.Height; j++) { c = bmap.GetPixel(i, j); double pR = c.R /255.0; pR -=0.5; pR *= contrast; pR +=0.5; pR *=255; if (pR <0) pR =0; if (pR >255) pR =255; double pG = c.G /255.0; pG -=0.5; pG *= contrast; pG +=0.5; pG *=255; if (pG <0) pG =0; if (pG >255) pG =255; double pB = c.B /255.0; pB -=0.5; pB *= contrast; pB +=0.5; pB *=255; if (pB <0) pB =0; if (pB >255) pB =255; bmap.SetPixel(i, j, Color.FromArgb((byte)pR, (byte)pG, (byte)pB)); } } _currentBitmap = (Bitmap)bmap.Clone(); }

5. Grayscale(灰度) 　　灰度使用黑色调表示物体。 每个灰度对象都具有从 0%（白色）到 100%（黑色）的亮度值。 使用黑白或灰度扫描仪生成的图像通常以灰度显示。

C# code

///<summary>/// 设置灰度 ///</summary>publicvoid SetGrayscale() { Bitmap temp = (Bitmap)_currentBitmap; Bitmap bmap = (Bitmap)temp.Clone(); Color c; for (int i =0; i < bmap.Width; i++) { for (int j =0; j < bmap.Height; j++) { c = bmap.GetPixel(i, j); byte gray = (byte)(.299* c.R + .587* c.G + .114* c.B); bmap.SetPixel(i, j, Color.FromArgb(gray, gray, gray)); } } _currentBitmap = (Bitmap)bmap.Clone(); }

6. Invert(底片效果)
用255减去每个色彩元素的值。例如，当前像素红色为00,则设置其值为FF(FF=255-0)。

C# code

///<summary>/// 底片 ///</summary>publicvoid SetInvert() { Bitmap temp = (Bitmap)_currentBitmap; Bitmap bmap = (Bitmap)temp.Clone(); Color c; for (int i =0; i < bmap.Width; i++) { for (int j =0; j < bmap.Height; j++) { c = bmap.GetPixel(i, j); bmap.SetPixel(i, j, Color.FromArgb(255- c.R, 255- c.G, 255- c.B)); } } _currentBitmap = (Bitmap)bmap.Clone(); }

7. Resize(缩放)

C# code

///<summary>/// 缩放 ///</summary>///<param name="newWidth">宽</param>///<param name="newHeight">高</param>publicvoid Resize(int newWidth, int newHeight) { if (newWidth !=0&& newHeight !=0) { Bitmap temp = (Bitmap)_currentBitmap; Bitmap bmap =new Bitmap(newWidth, newHeight, temp.PixelFormat); double nWidthFactor = (double)temp.Width / (double)newWidth; double nHeightFactor = (double)temp.Height / (double)newHeight; double fx, fy, nx, ny; int cx, cy, fr_x, fr_y; Color color1 =new Color(); Color color2 =new Color(); Color color3 =new Color(); Color color4 =new Color(); byte nRed, nGreen, nBlue; byte bp1, bp2; for (int x =0; x < bmap.Width; ++x) { for (int y =0; y < bmap.Height; ++y) { fr_x = (int)Math.Floor(x * nWidthFactor); fr_y = (int)Math.Floor(y * nHeightFactor); cx = fr_x +1; if (cx >= temp.Width) cx = fr_x; cy = fr_y +1; if (cy >= temp.Height) cy = fr_y; fx = x * nWidthFactor - fr_x; fy = y * nHeightFactor - fr_y; nx =1.0- fx; ny =1.0- fy; color1 = temp.GetPixel(fr_x, fr_y); color2 = temp.GetPixel(cx, fr_y); color3 = temp.GetPixel(fr_x, cy); color4 = temp.GetPixel(cx, cy); // Blue bp1 = (byte)(nx * color1.B + fx * color2.B); bp2 = (byte)(nx * color3.B + fx * color4.B); nBlue = (byte)(ny * (double)(bp1) + fy * (double)(bp2)); // Green bp1 = (byte)(nx * color1.G + fx * color2.G); bp2 = (byte)(nx * color3.G + fx * color4.G); nGreen = (byte)(ny * (double)(bp1) + fy * (double)(bp2)); // Red bp1 = (byte)(nx * color1.R + fx * color2.R); bp2 = (byte)(nx * color3.R + fx * color4.R); nRed = (byte)(ny * (double)(bp1) + fy * (double)(bp2)); bmap.SetPixel(x, y, System.Drawing.Color.FromArgb(255, nRed, nGreen, nBlue)); } } _currentBitmap = (Bitmap)bmap.Clone(); } }

8. Rotating and Flipping(镜像)

C# code

///<summary>/// 翻转 ///</summary>///<param name="rotateFlipType">图像的旋转方向和用于翻转图像的轴。</param>publicvoid RotateFlip(RotateFlipType rotateFlipType) { Bitmap temp = (Bitmap)_currentBitmap; Bitmap bmap = (Bitmap)temp.Clone(); bmap.RotateFlip(rotateFlipType); _currentBitmap = (Bitmap)bmap.Clone(); }

9. Crop(裁剪)

C# code

///<summary>/// 裁剪 ///</summary>///<param name="xPosition">X起始点</param>///<param name="yPosition">Y起始点</param>///<param name="width">宽</param>///<param name="height">高</param>publicvoid DrawOutCropArea(int xPosition, int yPosition, int width, int height) { _bitmapPrevCropArea = (Bitmap)_currentBitmap; Bitmap bmap = (Bitmap)_bitmapPrevCropArea.Clone(); Graphics gr = Graphics.FromImage(bmap); Brush cBrush =new Pen(Color.FromArgb(150, Color.White)).Brush; Rectangle rect1 =new Rectangle(0, 0, _currentBitmap.Width, yPosition); Rectangle rect2 =new Rectangle(0, yPosition, xPosition, height); Rectangle rect3 =new Rectangle(0, (yPosition + height), _currentBitmap.Width, _currentBitmap.Height); Rectangle rect4 =new Rectangle((xPosition + width), yPosition, (_currentBitmap.Width - xPosition - width), height); gr.FillRectangle(cBrush, rect1); gr.FillRectangle(cBrush, rect2); gr.FillRectangle(cBrush, rect3); gr.FillRectangle(cBrush, rect4); _currentBitmap = (Bitmap)bmap.Clone(); }

C# code

///<summary>/// 裁剪 ///</summary>///<param name="xPosition">X点位置</param>///<param name="yPosition">Y点位置</param>///<param name="width">宽度</param>///<param name="height">高度</param>publicvoid Crop(int xPosition, int yPosition, int width, int height) { Bitmap temp = (Bitmap)_currentBitmap; Bitmap bmap = (Bitmap)temp.Clone(); if (xPosition + width > _currentBitmap.Width) width = _currentBitmap.Width - xPosition; if (yPosition + height > _currentBitmap.Height) height = _currentBitmap.Height - yPosition; Rectangle rect =new Rectangle(xPosition, yPosition, width, height); _currentBitmap = (Bitmap)bmap.Clone(rect, bmap.PixelFormat); }

 

 

 

#4楼 得分：0回复于：2009-04-20 00:54:56 10. Inserting Text, Any Other Images and Shapes(插入文字或其它图像或形状) 插入文字 C# code ///<summary>/// 插入文字 ///</summary>///<param name="text">要插入的文字</param>///<param name="xPosition">X位置</param>///<param name="yPosition">Y位置</param>///<param name="fontName">字体</param>///<param name="fontSize">大小</param>///<param name="fontStyle">类型</param>///<param name="colorName1">颜色</param>///<param name="colorName2">颜色</param>publicvoid InsertText(string text, int xPosition, int yPosition, string fontName, float fontSize, string fontStyle, string colorName1, string colorName2) { Bitmap temp = (Bitmap)_currentBitmap; Bitmap bmap = (Bitmap)temp.Clone(); Graphics gr = Graphics.FromImage(bmap); if (string.IsNullOrEmpty(fontName)) fontName ="Times New Roman"; if (fontSize.Equals(null)) fontSize =10.0F; Font font =new Font(fontName, fontSize); if (!string.IsNullOrEmpty(fontStyle)) { FontStyle fStyle = FontStyle.Regular; switch (fontStyle.ToLower()) { case"bold": fStyle = FontStyle.Bold; break; case"italic": fStyle = FontStyle.Italic; break; case"underline": fStyle = FontStyle.Underline; break; case"strikeout": fStyle = FontStyle.Strikeout; break; } font =new Font(fontName, fontSize, fStyle); } if (string.IsNullOrEmpty(colorName1)) colorName1 ="Black"; if (string.IsNullOrEmpty(colorName2)) colorName2 = colorName1; Color color1 = Color.FromName(colorName1); Color color2 = Color.FromName(colorName2); int gW = (int)(text.Length * fontSize); gW = gW ==0?10 : gW; LinearGradientBrush LGBrush =new LinearGradientBrush(new Rectangle(0, 0, gW, (int)fontSize), color1, color2, LinearGradientMode.Vertical); gr.DrawString(text, font, LGBrush, xPosition, yPosition); _currentBitmap = (Bitmap)bmap.Clone(); } 插入图像 C# code ///<summary>/// 插入图像 ///</summary>///<param name="imagePath">要插入的图像路径</param>///<param name="xPosition">X位置</param>///<param name="yPosition">Y位置</param>publicvoid InsertImage(string imagePath, int xPosition, int yPosition) { Bitmap temp = (Bitmap)_currentBitmap; Bitmap bmap = (Bitmap)temp.Clone(); Graphics gr = Graphics.FromImage(bmap); if (!string.IsNullOrEmpty(imagePath)) { Bitmap i_bitmap = (Bitmap)Bitmap.FromFile(imagePath); Rectangle rect =new Rectangle(xPosition, yPosition, i_bitmap.Width, i_bitmap.Height); gr.DrawImage(Bitmap.FromFile(imagePath), rect); } _currentBitmap = (Bitmap)bmap.Clone(); } 插入图形 C# code ///<summary>/// 插入形状 ///</summary>///<param name="shapeType"></param>///<param name="xPosition"></param>///<param name="yPosition"></param>///<param name="width"></param>///<param name="height"></param>///<param name="colorName"></param>publicvoid InsertShape(string shapeType, int xPosition, int yPosition, int width, int height, string colorName) { Bitmap temp = (Bitmap)_currentBitmap; Bitmap bmap = (Bitmap)temp.Clone(); Graphics gr = Graphics.FromImage(bmap); if (string.IsNullOrEmpty(colorName)) colorName ="Black"; Pen pen =new Pen(Color.FromName(colorName)); switch (shapeType.ToLower()) { case"filledellipse": gr.FillEllipse(pen.Brush, xPosition, yPosition, width, height); break; case"filledrectangle": gr.FillRectangle(pen.Brush, xPosition, yPosition, width, height); break; case"ellipse": gr.DrawEllipse(pen, xPosition, yPosition, width, height); break; case"rectangle": default: gr.DrawRectangle(pen, xPosition, yPosition, width, height); break; } _currentBitmap = (Bitmap)bmap.Clone(); }