标题: C#图像处理类
作者: dnawo
日期: 2008-03-26 05:50 PM
分类: Web编程
内容: 使用此类可实现生成缩略图、漫射效果、棕褐色调 (老照片)效果、锐化效果、黑白效果和灰度效果。
复制内容到剪贴板 程序代码/// <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();
}
}
}
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