What do all the orientation constants of the ExifInterface class in Android mean?

Question

I understand what the ORIENTATION_NORMAL, ORIENTATION_ROTATE_180, ORIENTATION_ROTATE_270, ORIENTATION_ROTATE_90 and ORIENTATION_UNDEFINED.

However i do not understand what ORIENTATION_FLIP_HORIZONTAL, ORIENTATION_FLIP_VERTICAL, ORIENTATION_TRANSPOSE and ORIENTATION_TRANSVERSE means in the ExifInterface class in Android. I have searched through Google and could not find anything.

Thanks in advance.

Answer 1

Here are comments from source code (android\media\ExifInterface.java):

// left right reversed mirror
public static final int ORIENTATION_FLIP_HORIZONTAL = 2;
// upside down mirror
public static final int ORIENTATION_FLIP_VERTICAL = 4;
// flipped about top-left <--> bottom-right axis
public static final int ORIENTATION_TRANSPOSE = 5;
// flipped about top-right <--> bottom-left axis
public static final int ORIENTATION_TRANSVERSE = 7;

I think they are self-explaining.