How to use "IMAQ ComplexPlaneToImage"? (Display after "IMAQ FFT")

Hello,I use two ways to display a image after "IMAQ FFT":
(1). Input a image->IMAQ FFT->Windraw(display);
(2). Input a image->IMAQ FFT->IMAQ ComplexPlaneToImage(extracting magnitude) ->Winddraw(display).
The two results are much different.
I want to know what the two displayed images(especially in the second way) mean and where
"IMAQ ComplexPlaneToImage" usually used.
Thanks for your help!

Hi Dan
I am having some questions regarding the FFT Phase of the FFT with IMAQ ComplexPlaneToImage.
From the posting below you mention that the phase is:
Phase = Real/Magnitude.
I am using the function ComplexPlaneToArray to see the value I am getting from ComplexPlaneToImage.
Usually the phase is the inverse tangent  (Imaginary/Real). If we are using the Real and magnitude it will be the inverse cos(Real/Magnitude)
I tried the above senario to verify the phase value we are getting from ComplexPlaneToArray.
However, I get not get the value you are displaying in the phase  (ComplexPlaneToArray).
How can I verify  ComplexPaneToArray ( phase) with the various
ComplexPaneToArray(real)
ComplexPaneToArray(magnitude)
ComplexPlaneToArray(imaginary)
I attached a phase fft.vi as an example of my issue.
Regards,
Corinne
Attachments:
phase fft.vi ‏153 KB

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