For this exercise, I’d like you to find an image and point out high spatial frequencies features and low spatial frequency features. It can be a photo of your own, or one you take, or an image from the internet.
For instance, I might pick my favorite Arcimboldo image (https://www.artsy.net/article/artsy-editorial-renaissance-artist-fruit-faced-portraits-inspired-surrealists); the vegetables are in the high spatial frequencies and the face itself is in the low. Remember, the small details will be in the high frequencies, and the big, broad features and regions will be in the low. Here’s one trick you can use that works on any image: squint your eyes a lot until it is very blurry. All the things you can no longer see because they are blurred out were the high frequency details. All the things you can still see are the low frequency features. For instance, in this example (https://tinyurl.com/y9kracmn), the architectural details are in the high spatial frequencies and the subtle play of light and dark among the sky and water are in the low spatial frequencies.
1) upload your image (or link to an image if you can’t upload for some reason)
2) let me know what you see in the high frequencies
3) let me know what you see in the low frequencies