how to convert 456*640*3 logical in to 456*640 logical image

what is the code to convert an image with 456*640*3 logical to an image with 456*640 logical

Answer 1

[Walter Roberson]

all(Your3DLogical, 3)    %3 planes are all set

or

any(Your3DLogical, 3)    %any of planes are set

or

sum(Your3DLogical, 3) >= 2  %majority: at least 2 planes are set