Color C;
int r, g, b, rV, gV, bV, rT, gT, bT, y, z;
Bitmap bmp = new Bitmap(pictureBox1.Image);//创建Bitmap对象
Bitmap tmp = (Bitmap)bmp.Clone();
//马赛克为5*5阵列
for (int i = 0; i < bmp.Width - 5; i += 5)
for (int j = 0; j < bmp.Height - 5; j += 5)
{
rT = 0; gT = 0; bT = 0;
//获取区域块的像素颜色分量值
for (y = 0; y <= 5; y++)
for (z = 0; z <= 5; z++)
{
C = bmp.GetPixel(i + y, j + z);
r = C.R;
g = C.G;
b = C.B;
rT = rT + r;
gT = gT + g;
bT = bT + b;
}
//取平均值
rV = (int)rT / 25;
gV = (int)gT / 25;
bV = (int)bT / 25;
//处理颜色值溢出
rV = rV > 255 ? 255 : rV;
rV = rV < 0 ? 0 : rV;
gV = gV > 255 ? 255 : gV;
gV = gV < 0 ? 0 : gV;
bV = bV > 255 ? 255 : bV;
bV = bV < 0 ? 0 : bV;
//用平均值绘制5*5区域图像
for (y = 0; y <= 5; y++)
for (z = 0; z <= 5; z++)
tmp.SetPixel(i + y, j + z, Color.FromArgb(rV, gV, bV));
}
pictureBox2.Image = tmp;
![](//images0.cnblogs.com/blog/511414/201501/221054002506509.png)