internal void WriteToImage(int bx, int by, Image <Rgba32> image)
            {
                Block8x8 block = this.SpectralBlocks[bx, by];

                for (int y = 0; y < 8; y++)
                {
                    for (int x = 0; x < 8; x++)
                    {
                        float val = this.GetBlockValue(block, x, y);

                        var    v     = new Vector4(val, val, val, 1);
                        Rgba32 color = default;
                        color.FromVector4(v);

                        int yy = (by * 8) + y;
                        int xx = (bx * 8) + x;
                        image[xx, yy] = color;
                    }
                }
            }