Harmonic Detective: Image FFT — ASO

By Corey Thomas Slick on AppTrack Ninja.

Graphic equalizer for images

Harmonic Detective is a graphic equalizer for images. An audio equalizer lets you turn bands of sound up or down; this does the same for a photo or scan — except the bands are the 2D spatial frequencies hiding under the pixels, and you draw them yourself. Load any image and see its live frequency map — a real 2D Fast Fourier Transform, the kind of tool that used to mean a MATLAB license or a Photoshop plug-in. Then reach in and act on exactly the frequencies you choose: • CUT a band — erase periodic noise, moiré, halftone screens, or scan-line banding • KEEP a band — isolate one structure on …

Categories: Utilities, Education

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