Lecture 3: Sampling, Aliasing, Antialiasing (57)
YoungNathan

What does a high pass filter look like spatially? Would it just be very small?

shannonhu-144

Here's an example of what a high pass filter looks like: https://www.semanticscholar.org/paper/Image-Sharpening-By-Gaussian-And-Butterworth-High-Dogra-Bhalla/03f7a3cb733f4b93d8265386406cc9f777e7f30e/figure/3

To answer your question, apparently it looks like the inverse of the low pass filter (e.g. replace the white with black, and the black with white). This makes sense since the high-pass filter is kind of like the reverse of the low-pass filter (if we don't consider medium frequencies), since you exclude low frequencies and keep high frequencies.

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