You can see exactly that with the speaker grill and the text (This type of transformation is notoriously bad at compressing images of text, and is why you shouldn't use jpg for pictures of text)
In this context, the edges of, say, the macbook are not "high frequency" content, since they only feature one change (low to high luminosity) in a given block rather than several (high-low-high-low-high) like for the grill.
In this context, the edges of, say, the macbook are not "high frequency" content, since they only feature one change (low to high luminosity) in a given block rather than several (high-low-high-low-high) like for the grill.