Mapping

funmap(M, f) Returns matrix M with function f applied to each element.

levelmap(M, vec) Returns matrix with intensity values specified by the vector vec by mapping pixel intensities in matrix M to vec's indices.

Arguments:

• M is an image matrix.
• f is a function in one variable.
• vec is a vector of real numbers between 0 and 255, inclusive. The last index of vec must equal the highest intensity in M.