The main advantage of convolutions when compared to correlations is that, differently from correlations, convolutions are able to always guarantee commutative and associative properties. True False Given the difficulty of achieving such characteristics, most feature descriptors are not invariant to changes in illumination, 2- and 3-dimensional rotations or scale changes True False Applying a gain (i.e., multiplying all pixel values of an image by a constant) increases the overall image contrast as well as its dynamic range. True False