Color C1, C2, C3, C4;
int r1, r2, r3, r4,
g1, g2, g3, g4,
b1, b2, b3, b4,
rx, ry, gx, gy, bx, by,
rr, gg, bb;
Bitmap bmp = new Bitmap(pictureBox1.Image);
Bitmap tmp = (Bitmap)bmp.Clone();
for (int i = 0; i < bmp.Width - 1; i++)
for (int j = 0; j < bmp.Height - 1; j++)
{
//获得相邻4个像素颜色值
///斜对角
C1 = bmp.GetPixel(i, j);
C2 = bmp.GetPixel(i + 1, j + 1);
C3 = bmp.GetPixel(i + 1, j);
C4 = bmp.GetPixel(i, j + 1);
//红色分量值
r1 = C1.R;
r2 = C2.R;
r3 = C3.R;
r4 = C4.R;
rx = r1 - r2;
ry = r3 - r4;
rr = Math.Abs(rx) + Math.Abs(ry) + 128;
//绿色分量值
g1 = C1.G;
g2 = C2.G;
g3 = C3.G;
g4 = C4.G;
gx = g1 - g2;
gy = g3 - g4;
gg = Math.Abs(gx) + Math.Abs(gy) + 128;
//蓝色分量值
b1 = C1.B;
b2 = C2.B;
b3 = C3.B;
b4 = C4.B;
bx = b1 - b2;
by = b3 - b4;
bb = Math.Abs(bx) + Math.Abs(by) + 128;
//处理颜色值溢出
rr = rr > 255 ? 255 : rr;
rr = rr < 0 ? 0 : rr;
gg = gg > 255 ? 255 : gg;
gg = gg < 0 ? 0 : gg;
bb = bb > 255 ? 255 : bb;
bb = bb < 0 ? 0 : bb;
tmp.SetPixel(i, j, Color.FromArgb(rr, gg, bb));
}
pictureBox2.Image = tmp;
![](//images0.cnblogs.com/blog/511414/201501/221122365784758.png)