Michael Vinther (MeeSoft Support Board: [url=http://meesoft.logicnet.dk/support/viewtopic.php?pid=4786#p4786]Deconvolution of image: how to fit your own - external FFT editing?[/url]) wrote:Yes, you can have a real and an imaginary part matrix. You can make IA show these two matrices if you select Fourier Transform and then Complex representation. When you do this you get the Fourier transform of the grayscale version of the image. To preserve the colors you need to split the image into the R,G,B components, edit them separately and them recombine them to a color image.
The image you see in the FFT filter dialog is the amplitude of the complex numbers, and this features does the color plane splitting in the background.
Michael Vinther (MeeSoft Support Board: [url=http://meesoft.logicnet.dk/support/viewtopic.php?pid=1769#p1769]How to use Freq Domain Filter?[/url]) wrote:In general the frequency domain filter window will show a spectrum with a number of white "hotspots" that represent the noise and can be removed with the erasor pen.
You need to turn down the "View scale" a few clicks to be able to see the hotspots. Note that the one in the top middle should not be removed as this is the actual picture information. You should not remove more than necessary as you will then also remove details from the picture.
You can also try the "Adaptive noise reduction" with a high filter strength.