//create grayscal bitmap from one band
public Bitmap createGrayscaleImagefromOneBand(byte[] byIn, int imgWidth, int imgHeight, int Stride, int BytesPerPixel)
{
Bitmap bmp = new Bitmap(imgWidth, imgHeight, PixelFormat.Format24bppRgb);
byte[] byOut = new byte[Stride * imgHeight];
Int32 ind = 0;
for (int i = 0; i < imgHeight; i++)
{
for (int j = 0; j < imgWidth; j++)
{
byte b = byIn[i * imgWidth + j];
ind = i * Stride + j * BytesPerPixel;
for (int k = 0; k < 3; k++)
{
byOut[ind] = b;
ind++;
}
}
}
imageByteArray imba = new imageByteArray();
bmp = imba.ByteArrayToBitmap(byOut, imgWidth, imgHeight);
return(bmp);
}
// get one band from the given bitmap to a byte array
public byte[] getOneBandtoByteArray(Bitmap img, int band)
{
imageByteArray imba = new imageByteArray(img);
byte[] byIn = imba.BitmapToByteArray(img);
int res = (img.Width) % 4;
Int32 stride = imba.Stride;
Int32 length = (Int32)(stride * img.Height);
byte[] byOut = new byte[length];
Int32 ind = 0;
Int32 indOut = 0;
for (int i = 0; i < img.Height; i++)
{
for (int j = 0; j < img.Width; j++)
{
ind = i * stride + j * imba.BytesPerPixel;
int col = byIn[ind + 2 - band];
byOut[indOut] = (byte)col;
indOut += 1;
}
}
return(byOut);
}
