C#

public struct image {
    private byte xy;
    private byte color;
    private byte gray;

    public int X {
        get { return xy>>4;}
        sey { xy=(value<<4) | (xy&0xF);}
    }

etc.
}

[StructLayout(LayoutKind.Explicit)]
public class SYSTEM_INFO
{
[FieldOffset(0)] public ulong OemId;
[FieldOffset(4)] public ulong PageSize;
[FieldOffset(16)] public ulong ActiveProcessorMask;
[FieldOffset(20)] public ulong NumberOfProcessors;
[FieldOffset(24)] public ulong ProcessorType;
}

<br />
<br />
class image<br />
{<br />
byte x; // 4 bits<br />
byte y; // 4 bits<br />
byte color; // 8 bits<br />
byte grayscale; // 1 bit<br />
byte spare; // 7 bits<br />
<br />
public byte[] getImageByteArray()<br />
{<br />
byte byteArray[3];<br />
byteArray[0] = x<<4 +y;<br />
byteArray[1] = color;<br />
byteArray[2] = grayscale<<7 + spare;<br />
}<br />
}<br />
<br />