Frequency analysis on JPEG compression (QF = 75). We show exemplary images from hor2zeb, Ukiyoe, ap2or, and map2sat categories (in the 1st column), JPEG compressed images (in the 2nd column), difference maps between original and JPEG compressed images (in the 3rd column), spectra of original images (in the 4th column) and spectra of compressed images (in the 5th column).