plug-in-fft-dir

Remi Peyronnet

Description

Apply an FFT to the image. This can remove (for example) moire patterns from images scanned from books: The image should be RGB (Image|Mode|RGB) Remove the alpha layer, if present (Image|Flatten Image) Select Filters|Generic|FFT Forward Use the preselected neutral grey to effectively remove any moir patterns from the image. Either paint over any patterns or - In the Layers window, select the layer, and 'Duplicate Layer' - Select Colours|Brightness-Contrast. Increase the Contrast to see any patterns. - Use the Rectangular and/or Elliptical Selection tools to select any patterns on the contrast layer. - Then remove the contrast layer leaving the original FFT layer with the selections. - Then select Edit|Fill with FG colour, remembering to cancel the Selection afterwards! Select Filters|Generic|FFT Inverse Voila, an image without the moire pattern!

Help

This plug-in applies a FFT to the image, for educationnal or effects purpose.


Type

unknown

Parameters

Type Name Description
PF_INT run-mode Interactive, non-interactive
PF_IMAGE image Input image (unused)
PF_DRAWABLE drawable Input drawable

Return

None