.ENTER DIMENSIONS (NSAM,NROW): 64,64
[Enter the dimensions of the image in the output file.]
[Following menu appears.]
.MENU:
(B)LANK -- BLANK IMAGE
(C)IRCLE -- FILLED CIRCLE
(Q)UICK -- RANDOM UNIFORM/GAUSSIAN STATISTICS
(R)ANDOM -- RANDOM UNIFORM/GAUSSIAN STATISTICS
(S)INE -- SET OF SINE WAVES
(T)EST -- 2D SINE WAVE
(W)EDGE -- DENSITY WEDGE
.ENTER B/C/Q/R/S/T/W: T
[Enter the desired option.]
[The output file will then contain a circle of radius 12.0
(filled with pixel values of 2.0, and a blank (pixel value 0.0)
background.]
.MEAN AND STANDARD. DEVIATION. OF GAUSSIAN DIST.: 0.0,0.35
[Enter the mean value and standard deviation of the gaussian
distribution for random numbers to be generated.]
[The random generator is the faster one of the two, yet in power of 2 images random generator creates image with a noisy, sine-shaped periodicity in the power spectrum. If the frequency distribution of the noise is critical option 'R' should be used.]
.I=1 AMPLITUDE, PHASE, SP. FREQUENCY (KX,KY): 1.0,45.,1,10
[Enter the amplitude and phase of the first sine wave,
and its X and Y frequencies, respectively.]
.I=2 AMPLITUDE, PHASE, SP. FREQUENCY (KX,KY): 2.5,90., -2,5
[Enter the relative amplitude and phase of the second
sine wave, and its X and Y frequencies, respectively.]
[The output file will now contain a 64 x 64 image, which is the sum of two sine waves, of specified amplitudes and phases, one of X-frequency 1 and Y-frequency 10, and the other of X-frequency -2 and Y-frequency 5. Note that the amplitudes and phases must be given as floating point numbers.