private void UnsafeShadesOfGray()
{
UnsafeBitmap bmp2 = new UnsafeBitmap((Bitmap)pictureBox1.Image.Clone());
int x, y, r, g, b; PixelData c;
int f;
bmp2.LockBitmap();
for (y = 0; y < bmp2.Bitmap.Height; ++y)
{
for (x = 0; x < bmp2.Bitmap.Width; ++x)
{
c = bmp2.GetPixel(x, y);
r = c.R;
g = c.G;
b = c.B;
f = (r + g + b) / 3;
//c = Color.FromArgb(255-r,255-g,255-b); //инверсия
//c = Color.FromArgb(f, f, f); // чб
c.R = (byte)f;
c.G = (byte)f;
c.B = (byte)f;
bmp2.SetPixel(x, y, c);
}
}
bmp2.UnlockBitmap();
pictureBox2.Image = bmp2.Bitmap;
}
private void FastConver()
{
Random rnd = new Random();
double[,] matrix = random();
/*{
* { 0.01, 0.02, 0.03, 0.04, 0.05 },
* {-0.75,0,0.2,1,-1 },
* { 0,0,-0.2,1,-1},
* { 0,-0.5,0.2,1,-1},
* { 0,0,-0.2,1,-1}
* };
*/
UnsafeBitmap bmp2 = new UnsafeBitmap((Bitmap)pictureBox1.Image.Clone());
int x, y;
double r = 0, g = 0, b = 0;
PixelData c = new PixelData();
swatch.Start();
bmp2.LockBitmap();
for (y = 2; y < bmp2.Bitmap.Height - 2; y++)
{
for (x = 2; x < bmp2.Bitmap.Width - 2; x++)
{
r = 0; g = 0; b = 0;
for (int i = -2; i < 3; i++)
{
for (int j = -2; j < 3; j++)
{
c = bmp2.GetPixel(x + i, y + j);
//r += c.R / 25; g += c.G / 25; b += c.B / 25;
r += c.R * matrix[i + 2, j + 2]; g += c.G * matrix[i + 2, j + 2]; b += c.B * matrix[i + 2, j + 2];
}
}
r = r < 0 ? 0 : (r > 255) ? 255 : r;
g = g < 0 ? 0 : (g > 255) ? 255 : g;
b = b < 0 ? 0 : (b > 255) ? 255 : b;
c.R = (byte)r;
c.G = (byte)g;
c.B = (byte)b;
bmp2.SetPixel(x, y, c);
}
}
bmp2.UnlockBitmap();
swatch.Stop();
pictureBox2.Image = bmp2.Bitmap;
}
