

Menu: Processing > Filters… > Advance>Fourier

Script: fourier


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Displays the input image frame number. If you want to apply the Fourier transform to another image, type or select the corresponding value.


Displays the number of the frame in which the output image will be created. Depending on the Preferences. ImageWarp will set it either to the first available value or to the Input frame number. Type or select another value if you want the output image to be created in a different frame.



Select this check box to watch the Preview of the output image.


Lets you select the direction of the transform.


Select Direct to apply the direct Fourier transform and convert the image from the spatial domain into the frequency domain.


Select Inverse to apply the inverse Fourier transform and convert the image from the frequency domain into the spatial domain.



Select this option to apply the Fast Fourier transform algorithm. The FFT algorithm is applied automatically if the horizontal and vertical sizes of the Input image or selection are powers of 2. If this is not the case, selecting the FFT option will cause the image to be expanded horizontally and vertically to the closest width and height which are powers of 2. This is done by surrounding the image with the black margins prior to the application of the function.

When the inverse transform is applied to the frequency image generated with the enforced FFT algorithm, the resulting image will retain the size of the original grayscale image.

