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Frequency Domain Analysis — Free Online Tool | Pixlane
Visualize the frequency content of any image using the Discrete Fourier Transform (DFT). View magnitude spectrum, phase spectrum, or both side by side.
Analyze image frequency domain with DFT — view magnitude and phase spectra instantly.
All processing runs locally in your browser. Your files never leave your device — no upload, no server, no signup required.
Frequently Asked Questions
What is the Discrete Fourier Transform (DFT)?
The DFT converts an image from the spatial domain to the frequency domain, revealing how much of each frequency is present. Low frequencies represent smooth regions; high frequencies represent edges and fine detail.
What do magnitude and phase spectra show?
The magnitude spectrum shows the strength of each frequency component — bright spots indicate dominant frequencies. The phase spectrum encodes the position and alignment of those frequencies, which is critical for reconstructing the original image.
Why is a logarithmic scale used for display?
Raw magnitude values span an enormous range. A log scale compresses this range so both strong low-frequency components and subtle high-frequency details are visible in the same image.
Is my image uploaded to a server?
No. All processing runs locally in your browser using WebAssembly. Your image never leaves your device — no upload, no server, no signup required.