public static class ImageProcess
{
/// <summary>
/// 图片旋转
/// </summary>
/// <param name="image"></param>
/// <param name="angle">旋转角度</param>
/// <returns></returns>
public static Image Rotation(Image image,float angle)
{
angle = 360 - angle % 360; //弧度转换
double radian = angle * Math.PI / 180.0;
double cos = Math.Cos(radian);
double sin = Math.Sin(radian);
//原图的宽和高
int w = image.Width;
int h = image.Height;
int W = (int)(Math.Max(Math.Abs(w * cos - h * sin), Math.Abs(w * cos + h * sin)));
int H = (int)(Math.Max(Math.Abs(w * sin - h * cos), Math.Abs(w * sin + h * cos)));
//目标位图
Bitmap dsImage = new Bitmap(W, H);
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(dsImage);
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Bilinear;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//计算偏移量
Point Offset = new Point((W - w) / 2, (H - h) / 2);
//构造图像显示区域：让图像的中心与窗口的中心点一致
Rectangle rect = new Rectangle(Offset.X, Offset.Y, w, h);
Point center = new Point(rect.X + rect.Width / 2, rect.Y + rect.Height / 2);
g.TranslateTransform(center.X, center.Y);
g.RotateTransform(360 - angle);
//恢复图像在水平和垂直方向的平移
g.TranslateTransform(-center.X, -center.Y);
g.DrawImage(image, rect);
//重至绘图的所有变换
g.ResetTransform();
g.Save();
g.Dispose();
return dsImage;
}
/// <summary>
/// 图片翻转
/// </summary>
/// <param name="image"></param>
/// <param name="type">1水平，2垂直，3水平垂直</param>
/// <returns></returns>
public static Image Turn(Image image,int type)
{
if (type == 1)
{
image.RotateFlip(RotateFlipType.RotateNoneFlipX);
}
else if (type == 2)
{
image.RotateFlip(RotateFlipType.RotateNoneFlipY);
}
else if (type == 3)
{
image.RotateFlip(RotateFlipType.RotateNoneFlipXY);
}
return image;
}
/// <summary>
/// 底片效果
/// </summary>
/// <param name="image"></param>
/// <returns></returns>
public static Image Film(Image image)
{
try
{
int height = image.Height;
int width = image.Width;
Bitmap newbitmap = new Bitmap(width, height);
Bitmap oldbitmap = (Bitmap)image;
Color pixel;
for (int x = 1; x < width; x++)
{
for (int y = 1; y < height; y++)
{
int r, g, b;
pixel = oldbitmap.GetPixel(x, y);
r = 255 - pixel.R;
g = 255 - pixel.G;
b = 255 - pixel.B;
newbitmap.SetPixel(x, y, Color.FromArgb(r, g, b));
}
}
return newbitmap;
}
catch
{
return null;
}
}
/// <summary>
/// 浮雕效果
/// </summary>
/// <param name="image"></param>
/// <returns></returns>
public static Image Relief(Image image)
{
try
{
int height = image.Height;
int width = image.Width;
Bitmap newbitmap = new Bitmap(width, height);
Bitmap oldbitmap = (Bitmap)image;
Color pixel1, pixel2;
for (int x = 0; x < width - 1; x++)
{
for (int y = 0; y < height - 1; y++)
{
int r, g, b;
pixel1 = oldbitmap.GetPixel(x, y);
pixel2 = oldbitmap.GetPixel(x + 1, y + 1);
r = Math.Abs(pixel1.R - pixel2.R + 128);
g = Math.Abs(pixel1.G - pixel2.G + 128);
b = Math.Abs(pixel1.B - pixel2.B + 128);
if (r > 255)
r = 255;
if (r < 0)
r = 0;
if (g > 255)
g = 255;
if (g < 0)
g = 0;
if (b > 255)
b = 255;
if (b < 0)
b = 0;
newbitmap.SetPixel(x, y, Color.FromArgb(r, g, b));
}
}
return newbitmap;
}
catch
{
return null;
}
}
/// <summary>
/// 黑白效果
/// </summary>
/// <param name="image"></param>
/// <returns></returns>
public static Image BlackAndWhite(Image image)
{
try
{
int height = image.Height;
int width = image.Width;
Bitmap newbitmap = new Bitmap(width, height);
Bitmap oldbitmap = (Bitmap)image;
Color pixel;
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
{
pixel = oldbitmap.GetPixel(x, y);
int r, g, b, Result = 0;
r = pixel.R;
g = pixel.G;
b = pixel.B;
//实例程序以加权平均值法产生黑白图像
int iType = 2;
switch (iType)
{
case 0://平均值法
Result = ((r + g + b) / 3);
break;
case 1://最大值法
Result = r > g ? r : g;
Result = Result > b ? Result : b;
break;
case 2://加权平均值法
Result = ((int)(0.7 * r) + (int)(0.2 * g) + (int)(0.1 * b));
break;
}
newbitmap.SetPixel(x, y, Color.FromArgb(Result, Result, Result));
}
return newbitmap;
}
catch
{
return null;
}
}
/// <summary>
/// 柔化效果
/// </summary>
/// <param name="image"></param>
/// <returns></returns>
public static Image Soften(Image image)
{
try
{
int height = image.Height;
int width = image.Width;
Bitmap newbitmap = new Bitmap(width, height);
Bitmap oldbitmap = (Bitmap)image;
Color pixel;
//高斯模板
int[] Gauss = { 1, 2, 1, 2, 4, 2, 1, 2, 1 };
for (int x = 1; x < width - 1; x++)
{
for (int y = 1; y < height - 1; y++)
{
int r = 0, g = 0, b = 0;
int Index = 0;
for (int col = -1; col <= 1; col++)
for (int row = -1; row <= 1; row++)
{
pixel = oldbitmap.GetPixel(x + row, y + col);
r += pixel.R * Gauss[Index];
g += pixel.G * Gauss[Index];
b += pixel.B * Gauss[Index];
Index++;
}
r /= 16;
g /= 16;
b /= 16;
//处理颜色值溢出
r = r > 255 ? 255 : r;
r = r < 0 ? 0 : r;
g = g > 255 ? 255 : g;
g = g < 0 ? 0 : g;
b = b > 255 ? 255 : b;
b = b < 0 ? 0 : b;
newbitmap.SetPixel(x - 1, y - 1, Color.FromArgb(r, g, b));
}
}
return newbitmap;
}
catch
{
return null;
}
}
/// <summary>
/// 锐化效果
/// </summary>
/// <param name="image"></param>
/// <returns></returns>
public static Image Sharpen(Image image)
{
try
{
int height = image.Height;
int width = image.Width;
Bitmap newbitmap = new Bitmap(width, height);
Bitmap oldbitmap = (Bitmap)image;
Color pixel;
//拉普拉斯模板
int[] Laplacian = { -1, -1, -1, -1, 9, -1, -1, -1, -1 };
for (int x = 1; x < width - 1; x++)
{
for (int y = 1; y < height - 1; y++)
{
int r = 0, g = 0, b = 0;
int Index = 0;
for (int col = -1; col <= 1; col++)
for (int row = -1; row <= 1; row++)
{
pixel = oldbitmap.GetPixel(x + row, y + col); r += pixel.R * Laplacian[Index];
g += pixel.G * Laplacian[Index];
b += pixel.B * Laplacian[Index];
Index++;
}
//处理颜色值溢出
r = r > 255 ? 255 : r;
r = r < 0 ? 0 : r;
g = g > 255 ? 255 : g;
g = g < 0 ? 0 : g;
b = b > 255 ? 255 : b;
b = b < 0 ? 0 : b;
newbitmap.SetPixel(x - 1, y - 1, Color.FromArgb(r, g, b));
}
}
return newbitmap;
}
catch
{
return null;
}
}
/// <summary>
/// 雾化效果
/// </summary>
/// <param name="image"></param>
/// <returns></returns>
public static Image Atomization(Image image)
{
try
{
int height = image.Height;
int width = image.Width;
Bitmap newbitmap = new Bitmap(width, height);
Bitmap oldbitmap = (Bitmap)image;
Color pixel;
for (int x = 1; x < width - 1; x++)
{
for (int y = 1; y < height - 1; y++)
{
System.Random MyRandom = new Random();
int k = MyRandom.Next(123456);
//像素块大小
int dx = x + k % 9;
int dy = y + k % 9;
if (dx >= width)
dx = width - 1;
if (dy >= height)
dy = height - 1;
pixel = oldbitmap.GetPixel(dx, dy);
newbitmap.SetPixel(x, y, pixel);
}
}
return newbitmap;
}
catch
{
return null;
}
}
/// <summary>
/// 图片明暗调整
/// </summary>
/// <param name="image"></param>
/// <param name="degree">亮度[-255,255]</param>
/// <returns></returns>
public static Image Brightness(Image image, int degree)
{
try
{
Bitmap b = (Bitmap)image;
if (degree < -255) degree = -255;
if (degree > 255) degree = 255;
int width = image.Width;
int height = image.Height;
int pix = 0;
BitmapData data = b.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
unsafe
{
byte* p = (byte*)data.Scan0;
int offset = data.Stride - width * 3;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
// 处理指定位置像素的亮度
for (int i = 0; i < 3; i++)
{
pix = p[i] + degree;
if (degree < 0) p[i] = (byte)Math.Max(0, pix);
if (degree > 0) p[i] = (byte)Math.Min(255, pix);
} // i
p += 3;
} // x
p += offset;
} // y
}
b.UnlockBits(data);
return image;
}
catch
{
return null;
}
}
/// <summary>
/// 灰色效果
/// </summary>
/// <param name="image"></param>
/// <returns></returns>
public static Image Gray(Image image)
{
try
{
Bitmap currentBitmap = (Bitmap)image.Clone();
Graphics g = Graphics.FromImage(currentBitmap);
ImageAttributes ia = new ImageAttributes();
float[][] colorMatrix = {
new float[] {0.299f, 0.299f, 0.299f, 0, 0},
new float[] {0.587f, 0.587f, 0.587f, 0, 0},
new float[] {0.114f, 0.114f, 0.114f, 0, 0},
new float[] {0, 0, 0, 1, 0},
new float[] {0, 0, 0, 0, 1}
};
ColorMatrix cm = new ColorMatrix(colorMatrix);
ia.SetColorMatrix(cm, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
g.DrawImage(currentBitmap, new Rectangle(0, 0, currentBitmap.Width, currentBitmap.Height), 0, 0, currentBitmap.Width, currentBitmap.Height, GraphicsUnit.Pixel, ia);
g.Dispose();
return (Image)(currentBitmap.Clone());
}
catch
{
return null;
}
}
/// <summary>
/// 图像对比度调整
/// </summary>
/// <param name="b">原始图</param>
/// <param name="degree">对比度[-100, 100]</param>
/// <returns></returns>
public static Bitmap KiContrast(Bitmap b, int degree)
{
if (b == null)
{
return null;
}
if (degree < -100) degree = -100;
if (degree > 100) degree = 100;
try
{
double pixel = 0;
double contrast = (100.0 + degree) / 100.0;
contrast *= contrast;
int width = b.Width;
int height = b.Height;
BitmapData data = b.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
unsafe
{
byte* p = (byte*)data.Scan0;
int offset = data.Stride - width * 3;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
// 处理指定位置像素的对比度
for (int i = 0; i < 3; i++)
{
pixel = ((p[i] / 255.0 - 0.5) * contrast + 0.5) * 255;
if (pixel < 0) pixel = 0;
if (pixel > 255) pixel = 255;
p[i] = (byte)pixel;
} // i
p += 3;
} // x
p += offset;
} // y
}
b.UnlockBits(data);
return b;
}
catch
{
return null;
}
}
}
