In [1]:

    

from PIL import Image
import numpy as np


    

In [4]:

    

from math import pi
arr = np.linspace(0, 2*pi, 256)
arr.shape


    

    
Out[4]:





(256,)

In [50]:

    

sin_arr = (np.sin(arr)+1.)/2.


    

In [51]:

    

from matplotlib import pylab
%matplotlib inline


    

In [52]:

    

pylab.plot(arr, sin_arr)


    

    
Out[52]:





[<matplotlib.lines.Line2D at 0x7f3661850c10>]






    

In [53]:

    

mat = np.repeat(sin_arr, 256).reshape((256, 256))


    

In [54]:

    

[np.max(mat), np.min(mat)]


    

    
Out[54]:





[0.99999051367436342, 9.4863256365762538e-06]

In [70]:

    

normalized = 255*mat


    

In [71]:

    

[np.max(normalized), np.min(normalized)]


    

    
Out[71]:





[254.99758098696267, 0.0024190130373269447]

In [72]:

    

img_mat = np.array(normalized, dtype=np.uint8)


    

In [73]:

    

np.min(img_mat)


    

    
Out[73]:





0

In [75]:

    

img = Image.fromarray(img_mat, mode="L")
img.save("/home/naoki/exp_c/notebooks/sin_y.png")


    

In [87]:

    

sin_arr = (np.sin(arr)+1.)/2.
mat = np.repeat(sin_arr, 256).reshape((256, 256)).transpose()
normalized = 255*mat
img_mat = np.array(normalized, dtype=np.uint8)
img = Image.fromarray(img_mat, mode="L")
img.save("/home/naoki/exp_c/notebooks/sin_x.png")
img_mat.tofile("/home/naoki/exp_c/notebooks/sin_x.bin")


    

In [88]:

    

sin_arr = (np.cos(arr)+1.)/2.
mat = np.repeat(sin_arr, 256).reshape((256, 256)).transpose()
normalized = 255*mat
img_mat = np.array(normalized, dtype=np.uint8)
img = Image.fromarray(img_mat, mode="L")
img.save("/home/naoki/exp_c/notebooks/cos_x.png")
img_mat.tofile("/home/naoki/exp_c/notebooks/cos_x.bin")


    

In [89]:

    

sin_arr = (np.cos(arr)+1.)/2.
mat = np.repeat(sin_arr, 256).reshape((256, 256))
normalized = 255*mat
img_mat = np.array(normalized, dtype=np.uint8)
img = Image.fromarray(img_mat, mode="L")
img.save("/home/naoki/exp_c/notebooks/cos_y.png")
img_mat.tofile("/home/naoki/exp_c/notebooks/cos_y.bin")


    

In [90]:

    

sin_mat = np.repeat((np.sin(arr)+1.)/2., 256).reshape((256, 256))
cos_mat = np.repeat((np.sin(arr)+1.)/2., 256).reshape((256, 256)).transpose()
mat = (sin_mat * cos_mat)
normalized = 255*mat
img_mat = np.array(normalized, dtype=np.uint8)
img = Image.fromarray(img_mat, mode="L")
img.save("/home/naoki/exp_c/notebooks/composed.png")
img_mat.tofile("/home/naoki/exp_c/notebooks/composed.bin")


    

In [ ]: