BlueChannel.cs

using System;
 
namespace IdApp.Cv.Channels
{
    public static partial class ChannelOperations
    {
        public static Matrix<byte> BlueChannel(this Matrix<uint> M)
        {
            int y, h = M.Height;
            int x, w = M.Width;
            int SrcOffset = M.Start;
            int DestOffset = 0;
            int SrcSkip = M.Skip;
            uint[] Src = M.Data;
            byte[] Dest = new byte[w * h];
 
            for (y = 0; y < h; y++, SrcOffset += SrcSkip)
            {
                for (x = 0; x < w; x++)
                    Dest[DestOffset++] = (byte)(Src[SrcOffset++] >> 16);
            }
 
            return new Matrix<byte>(w, h, Dest);
        }
 
        public static IMatrix BlueChannel(this IMatrix M)
        {
            if (M is Matrix<uint> M2)
                return BlueChannel(M2);
            else
                throw new ArgumentException("Unsupported type: " + M.GetType().FullName, nameof(M));
        }
    }
}