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We can change the frequency and amplitude to vary the nature of the noise. The middle image in this slide depicts the function

noise(x,y,z)

We can vary the effect of the noise by using the expression

noise(f*x, f*y, f*z) * a

where f controls the frequency and a controls the amplitude. Noise having large amplitudes will result in a greater range of colors. Noise having high frequency will contain more detail. In the slide there are four images surrounding the depiction of the original noise function. Which image portrays noise having lower frequency and lower amplitude than the original? Which has higher frequency and lower amplitude?