C#图像处理类

/// <summary>

/// 图像处理类，需引用System.IO和System.Drawing

/// </summary>

public static class PicProcesser

{

/// <summary>

/// 在指定位置生成，保存缩略图

/// </summary>

/// <param name="orgImgFilePath">原图地址</param>

/// <param name="smallFilePath">目标图地址</param>

/// <param name="width">缩略图宽</param>

/// <param name="height">缩略图高</param>

/// <param name="oWidth">原图宽</param>

/// <param name="oHeight">原图高</param>

/// <exception cref="ApplicationException">处理时产生的异常：源文件不存在，或无权限</exception>

public static void GetThumbnailImage(string orgImgFilePath, string smallFilePath, int width, int height, out int oWidth, out int oHeight)

{

Bitmap sourcePic;

try

{

sourcePic = new Bitmap(orgImgFilePath);

}

catch (ArgumentException ex)

{

throw new ApplicationException("源文件异常，可能是不存在。", ex);

}

oWidth = sourcePic.Width;

oHeight = sourcePic.Height;

int newWidth = oWidth;

int newHeight = oHeight;

float percent;

if (oWidth > width)

{

newWidth = width;

percent = float.Parse(newWidth.ToString()) / oWidth;

newHeight = (int)(oHeight * percent);

}

else if (oHeight > height)

{

newHeight = height;

percent = float.Parse(newHeight.ToString()) / oHeight;

newWidth = (int)(newWidth * percent);

}

Bitmap newPic = new Bitmap(newWidth, newHeight);

Graphics newGraphics = Graphics.FromImage(newPic);

newGraphics.DrawImage(sourcePic, 0, 0, newWidth, newHeight);

try

{

newPic.Save(smallFilePath);

}

catch (ApplicationException ex)

{

throw new ApplicationException("保存缩略图异常。", ex);

}

finally

{

newGraphics.Dispose();

newPic.Dispose();

sourcePic.Dispose();

}

}

/// <summary>

/// 漫射效果

/// </summary>

/// <param name="orgImgFilePath">源图地址</param>

/// <param name="destImgFilePath">目标图地址</param>

/// <param name="stride">图片扫描宽度(0为自动获取)</param>

public static void EffectDiffuse(string orgImgFilePath, string destImgFilePath, int stride)

{

Bitmap sourcePic;

try

{

sourcePic = new Bitmap(orgImgFilePath);

}

catch (ArgumentException ex)

{

throw new ApplicationException("源文件异常，可能是不存在。", ex);

}

int w, h;

w = sourcePic.Width;

h = sourcePic.Height;

Random random = new Random();

Bitmap newPic = new Bitmap(w, h);

if (stride == 0)

{

//lock in memeory

Rectangle rect = new Rectangle(0, 0, sourcePic.Width, sourcePic.Height);

System.Drawing.Imaging.BitmapData bmpData = sourcePic.LockBits(rect,

System.Drawing.Imaging.ImageLockMode.ReadWrite,

sourcePic.PixelFormat);

stride = bmpData.Stride;

//unlock

sourcePic.UnlockBits(bmpData);

}

for (int x = 0; x < w; x++)

{

for (int y = 0; y < h; y++)

{

int newX;

int newY;

newX = x + (int)(random.NextDouble() * stride);

newY = y + (int)(random.NextDouble() * stride);

newPic.SetPixel(x, y, sourcePic.GetPixel(newX >= w ? w - 1 : newX, newY >= h ? h - 1 : newY));

}

}

try

{

newPic.Save(destImgFilePath);

}

catch (ApplicationException ex)

{

throw new ApplicationException("保存缩略图异常。", ex);

}

finally

{

newPic.Dispose();

sourcePic.Dispose();

}

}

/// <summary>

/// 棕褐色调 (老照片)效果

/// </summary>

/// <param name="orgImgFilePath">源图地址</param>

/// <param name="destImgFilePath">目标图地址</param>

public static void EffectEpia(string orgImgFilePath, string destImgFilePath)

{

Bitmap sourcePic;

try

{

sourcePic = new Bitmap(orgImgFilePath);

}

catch (ArgumentException ex)

{

throw new ApplicationException("源文件异常，可能是不存在。", ex);

}

int w, h;

w = sourcePic.Width;

h = sourcePic.Height;

Bitmap newPic = new Bitmap(w, h);

Color color;

for (int x = 0; x < w; x++)

{

for (int y = 0; y < h; y++)

{

color = sourcePic.GetPixel(x, y);

int r = (int)(0.393 * color.R + 0.769 * color.G + 0.189 * color.B);

int g = (int)(0.349 * color.R + 0.686 * color.G + 0.168 * color.B);

int b = (int)(0.272 * color.R + 0.534 * color.G + 0.131 * color.B);

Color newColor = Color.FromArgb(r > 255 ? 255 : r, g > 255 ? 255 : g, b > 255 ? 255 : b);

newPic.SetPixel(x, y, newColor);

}

}

try

{

newPic.Save(destImgFilePath);

}

catch (ApplicationException ex)

{

throw new ApplicationException("保存缩略图异常。", ex);

}

finally

{

newPic.Dispose();

sourcePic.Dispose();

}

}

/// <summary>

/// 锐化效果

/// </summary>

/// <param name="orgImgFilePath">源图地址</param>

/// <param name="destImgFilePath">目标图地址</param>

/// <param name="depth">锐化度</param>

public static void EffectSharpen(string orgImgFilePath, string destImgFilePath, float depth)

{

Bitmap sourcePic;

try

{

sourcePic = new Bitmap(orgImgFilePath);

}

catch (ArgumentException ex)

{

throw new ApplicationException("源文件异常，可能是不存在。", ex);

}

int w, h;

w = sourcePic.Width;

h = sourcePic.Height;

Bitmap newPic = new Bitmap(w, h);

Color color;

for (int x = 0; x < w; x++)

{

for (int y = 0; y < h; y++)

{

//左上方 像素色值

Color colorLT = sourcePic.GetPixel(x == 0 ? x : x - 1, y == 0 ? y : y - 1);

//原图当前像素

color = sourcePic.GetPixel(x, y);

int r = (int)(color.R + depth * (color.R - colorLT.R));

if (r < 0) r = 0;

int g = (int)(color.G + depth * (color.G - colorLT.G));

if (g < 0) g = 0;

int b = (int)(color.B + depth * (color.B - colorLT.B));

if (b < 0) b = 0;

Color newColor = Color.FromArgb(r > 255 ? 255 : r, g > 255 ? 255 : g, b > 255 ? 255 : b);

newPic.SetPixel(x, y, newColor);

}

}

try

{

newPic.Save(destImgFilePath);

}

catch (ApplicationException ex)

{

throw new ApplicationException("保存缩略图异常。", ex);

}

finally

{

newPic.Dispose();

sourcePic.Dispose();

}

}

/// <summary>

/// 黑白效果

/// </summary>

/// <param name="orgImgFilePath">源图地址</param>

/// <param name="destImgFilePath">目标图地址</param>

public static void EffectBlackWhite(string orgImgFilePath, string destImgFilePath)

{

Bitmap sourcePic;

try

{

sourcePic = new Bitmap(orgImgFilePath);

}

catch (ArgumentException ex)

{

throw new ApplicationException("源文件异常，可能是不存在。", ex);

}

int w, h;

w = sourcePic.Width;

h = sourcePic.Height;

Bitmap newPic = new Bitmap(w, h);

Color color;

for (int x = 0; x < w; x++)

{

for (int y = 0; y < h; y++)

{

Color newColor;

color = sourcePic.GetPixel(x, y);

int v = (color.R + color.G + color.B) / 3;

if (v > 255 / 2)

newColor = Color.FromArgb(255, 255, 255);

else

newColor = Color.FromArgb(0, 0, 0);

newPic.SetPixel(x, y, newColor);

}

}

try

{

newPic.Save(destImgFilePath);

}

catch (ApplicationException ex)

{

throw new ApplicationException("保存缩略图异常。", ex);

}

finally

{

newPic.Dispose();

sourcePic.Dispose();

}

}

/// <summary>

/// 灰度效果

/// </summary>

/// <param name="orgImgFilePath">源图地址</param>

/// <param name="destImgFilePath">目标图地址</param>

public static void EffectGray(string orgImgFilePath, string destImgFilePath)

{

Bitmap sourcePic;

try

{

sourcePic = new Bitmap(orgImgFilePath);

}

catch (ArgumentException ex)

{

throw new ApplicationException("源文件异常，可能是不存在。", ex);

}

int w, h;

w = sourcePic.Width;

h = sourcePic.Height;

Bitmap newPic = new Bitmap(w, h);

Color color;

for (int x = 0; x < w; x++)

{

for (int y = 0; y < h; y++)

{

color = sourcePic.GetPixel(x, y);

int gray = (int)(0.299 * color.R + 0.587 * color.G + 0.114 * color.B);

//Gary = (R * 77 + G * 151 + B * 28) >> 8;

////Gray = 0.299 * R + 0.587 * G + 0.114 * B

Color newColor = Color.FromArgb(gray, gray, gray);

newPic.SetPixel(x, y, newColor);

}

}

try

{

newPic.Save(destImgFilePath);

}

catch (ApplicationException ex)

{

throw new ApplicationException("保存缩略图异常。", ex);

}

finally

{

newPic.Dispose();

sourcePic.Dispose();

}

}

}