I would like to know the number of bits in a grayscale picture? How do I find this?

I have a grayscale image that is 256x256 pixels.

How do I compute the number of bits in the image?

[Jan]

It depends on what "number of bits" mean. What exactly does "I have a greayscale image" means - as file, as matrix, and in the later case, in which data type? Please explain, what your inputs are.

[Victor Fletcher]

Bits as in 2^N possible intensities that a pixel can possibly take.

It is a .tif file.

I used the max function to calculate the maximum intensity value.

Then I used log function to convert it to N.