JEOL JSPM-5200 Instructions Manual page 380

６ ANALYSIS OPERATION
■ Forward
This function Fourier-transforms the current image, and displays the transformed spot
(diffraction image).
Select Forward from the FFT window.
Fourier transformation starts, and the spot (diffraction image) resulting from
transformation is displayed.
■ Inverse
This function performs reverse Fourier transformation on a Fourier-transformed spot
(diffraction image), and displays a real image.
Display the Fourier-transformed spot (diffraction image) in the Display
Window, and select Inverse in the FFT window.
Reverse Fourier transformation starts, and a real image is displayed.
■ Contrast × 2
This function accentuates the contrast (brightness) of the spot image that was
Fourier-transformed using Forward.
Display a spot image, and select Contrast × 2 of the FFT window.
The contrast (brightness) is intensified by a factor of two.
6-50
If the spot is dark, you can increase the contrast using Contrast × 2.
If you wish to recall a spot (diffraction image) that was previously Fou-
rier-transformed and memorized in the computer, use Display to display the
spot image. If you select Select to display an image, the computer will recog-
nize the image as a spot image, preventing it from being re-
verse-Fourier-transformed.
The contrast enhancement is performed only on the displayed image and has
nothing to do with the original data itself.
The Contrast × 2 operation can be repeated as many times as needed until a
good enough contrast is obtained. The contrast is doubled each time.
TMPM5200-2