In the target image, byte 0 is red, byte 1 is blue, byte 3 is red. In the candidate stream, byte 0 is 4. The error is minimised if byte 2 is also 4. The valu

In the target image, byte 0 is red, byte 1 is blue, byte 3 is red. In the candidate stream, byte 0 is 4. The error is minimised if byte 2 is also 4. The values of the bytes don't matter, just the patterns of which bytes have the same value.