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More specifically, GFourier calculates the Fourier Transform of an image; you can then design and apply some simple filters; later, you can use the Inverse Fourier Transform to substitute the original image or create a new one. You can perform some transforms to the complex data too, like rotations, scaling and others; several math operations between two matrices of data is also available.
Most recent version is 0.4.1; versions 0.x.x are still being developed, and that means they may contain severe bugs or be incomplete.
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