p=Integer.MAX_VALUE;
p=0x00FFFFFF;
    private static int doAlpha(byte[] pix, byte[] alpha, int pos, int shift) {        int p;        int a;        if (isBitSet(pix[pos],shift))            p=0;        else            p=Integer.MAX_VALUE;        if (alpha == null || isBitSet(alpha[pos],shift))            a=Integer.MIN_VALUE;        else            a=0;        return p|a;    }