How many color patterns can you create by reversing the colors of combinations of rows and columns from a checkerboard?

The row and column color reversals are done one after the other. The order in which they are chosen does not make a difference, but note that a square that is in the intersection of one of the rows and one of the columns gets its color changed twice, once by a row and once by a column, so it will keep its original color. What happens if all the rows and columns are selected? What impact does this have on the total number of color patterns?