/// <summary>
/// 底片效果（反色）
/// </summary>
/// <param name="bmp"></param>
/// <returns></returns>
public static Bitmap NegativeImage(Bitmap bmp)
{
int height = bmp.Height;
int width = bmp.Width;
Bitmap newbmp = new Bitmap(width, height);
LockBitmap lbmp = new LockBitmap(bmp);
LockBitmap newlbmp = new LockBitmap(newbmp);
lbmp.LockBits();
newlbmp.LockBits();
Color pixel;
for (int x = 1; x < width; x++)
{
for (int y = 1; y < height; y++)
{
int r, g, b;
pixel = lbmp.GetPixel(x, y);
r = 255 - pixel.R;
g = 255 - pixel.G;
b = 255 - pixel.B;
newlbmp.SetPixel(x, y, Color.FromArgb(r, g, b));
}
}
lbmp.UnlockBits();
newlbmp.UnlockBits();
return(newbmp);
}
//浮雕
public static Bitmap EmbossmentImage(Bitmap bmp)
{
int height = bmp.Height;
int width = bmp.Width;
Bitmap newbmp = new Bitmap(width, height);
LockBitmap lbmp = new LockBitmap(bmp);
LockBitmap newlbmp = new LockBitmap(newbmp);
lbmp.LockBits();
newlbmp.LockBits();
Color pixel1, pixel2;
for (int x = 0; x < width - 1; x++)
{
for (int y = 0; y < height - 1; y++)
{
int r = 0, g = 0, b = 0;
pixel1 = lbmp.GetPixel(x, y);
pixel2 = lbmp.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;
}
newlbmp.SetPixel(x, y, Color.FromArgb(r, g, b));
}
}
lbmp.UnlockBits();
newlbmp.UnlockBits();
return(newbmp);
}
/// <summary>
/// 图片黑白处理
/// </summary>
/// <param name="bmp"></param>
/// <param name="type"></param>
/// <returns></returns>
public static Bitmap GrayImage(Bitmap bmp, int type)
{
int height = bmp.Height;
int width = bmp.Width;
Bitmap newbmp = new Bitmap(width, height);
LockBitmap lbmp = new LockBitmap(bmp);
LockBitmap newlbmp = new LockBitmap(newbmp);
lbmp.LockBits();
newlbmp.LockBits();
Color pixel;
for (int x = 0; x < width; x++)
{
for (int y = 0; y < height; y++)
{
pixel = lbmp.GetPixel(x, y);
int r, g, b, Result = 0;
r = pixel.R;
g = pixel.G;
b = pixel.B;
switch (type)
{
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)(0.3 * r) + (int)(0.59 * g) + (int)(0.11 * b));
break;
}
newlbmp.SetPixel(x, y, Color.FromArgb(Result, Result, Result));
}
}
lbmp.UnlockBits();
newlbmp.UnlockBits();
return(newbmp);
}