Slick Engineering & Consulting
Harmonic Detective
A graphic equalizer for images — reach into the 2D frequency spectrum and cut, keep, or boost detail. For iPad and Mac.
Free to download. Use the full instrument on screen — load any image, see its live spectrum, draw a region, and watch the result rebuild in real time, with a dozen built-in test images to try it on. A one-time $9.99 Pro unlock (no subscription) adds saving & export, multiple frequency regions at once, and raw FFT-mask export. One purchase covers iPad and Mac.
Load an image, see its frequency spectrum, draw a Region of Interest directly on that spectrum, and scale or extract exactly the frequencies you selected. Built for periodic-noise removal, pattern and texture isolation, moiré and halftone analysis, and frequency-domain feature extraction.
The Harmonic Detective app runs entirely on-device. No account, no sign-in, no internet connection, and no app analytics.