To provide an error spread processing method that can suppress production of a texture without increasing a sense of roughness with a simple configuration.

As an error spread filter to decide an error distribution ratio pattern in the error spread processing method, a 1st error spread filter whose distribution ratio is set to facilitate distribution of errors in the main scanning direction and a 2nd error spread filter whose distribution ratio is set to facilitate distribution of errors in the sub scanning direction are prepared and this method regularly selects the 1st error spread filter or the 2nd error spread filter and uses the selected filter.