how to convert the byte array into an integer array

Question

I am working on a project in which I am receiving image data as an array of bytes (1-byte per pixel). Each byte represents a greyscale integer (0-255).

In order to

Answer 1

Anything wrong with the simple approach?

public static int[] convertToIntArray(byte[] input)
{
    int[] ret = new int[input.length];
    for (int i = 0; i < input.length; i++)
    {
        ret[i] = input[i] & 0xff; // Range 0 to 255, not -128 to 127
    }
    return ret;
}

EDIT: If you want a range of -128 to 127:

public static int[] convertToIntArray(byte[] input)
{
    int[] ret = new int[input.length];
    for (int i = 0; i < input.length; i++)
    {
        ret[i] = input[i];
    }
    return ret;
}