11-12-2019, 07:36 PM
You can try the more usual FFT plugin. This one 64 bit for Windows.
Unzip the attached file and put the whole folder fourier (which contains two files, fourier.exe & libfftw3-3.dll ) in your Gimp profile C:\Users\"yourname"\AppData\Roaming\GIMP\2.10\plug-ins .
The plugin shows in Filters -> Generic -> FFT Forward (and FFT Reverse)
Apply FFT Forward to your image. The FG color is automatically changed to the correct grey. There is no selection to worry about, you can apply a Transparent-to-Grey gradient same as with the gmic filter. When finished apply FFT Reverse to get back to your image.
Some images have noticeable defects in the FFT image. You can paint these out instead of applying a gradient. Sometimes gives better results.
Example: some screenshots
https://i.imgur.com/U1EAfAn.jpg
(1) This has a regular pattern - from a scanned magazine image.
(2) Applied FFT Forward and painted out some of the defects (red X ) still have magenta to paint out. Keep away from the center or you will totally blur Otherwise you do not have to be very accurate.
https://i.imgur.com/YR15Ul7.jpg
(3) Completed painting out the defects - dotted round so you can see them
(4) Applied FFT Reverse
Unzip the attached file and put the whole folder fourier (which contains two files, fourier.exe & libfftw3-3.dll ) in your Gimp profile C:\Users\"yourname"\AppData\Roaming\GIMP\2.10\plug-ins .
The plugin shows in Filters -> Generic -> FFT Forward (and FFT Reverse)
Apply FFT Forward to your image. The FG color is automatically changed to the correct grey. There is no selection to worry about, you can apply a Transparent-to-Grey gradient same as with the gmic filter. When finished apply FFT Reverse to get back to your image.
Some images have noticeable defects in the FFT image. You can paint these out instead of applying a gradient. Sometimes gives better results.
Example: some screenshots
https://i.imgur.com/U1EAfAn.jpg
(1) This has a regular pattern - from a scanned magazine image.
(2) Applied FFT Forward and painted out some of the defects (red X ) still have magenta to paint out. Keep away from the center or you will totally blur Otherwise you do not have to be very accurate.
https://i.imgur.com/YR15Ul7.jpg
(3) Completed painting out the defects - dotted round so you can see them
(4) Applied FFT Reverse