from PIL import Image
import numpy as np
a=np.asarray(Image.open('wechat.jpeg').convert('L')).astype('float')
depth=10.                     #（0-100）
grad=np.gradient(a)           #取图像灰度的梯度值
grad_x,grad_y=grad            #分别取纵横图像梯度值
grad_x=grad_x*depth/100.      
grad_y=grad_y*depth/100.      
A=np.sqrt(grad_x**2+grad_y**2+1,)
uni_x=grad_x/A
uni_y=grad_y/A
uni_z=1./A
vec_el=np.pi/2.2             #
vec_az=np.pi/4,
dx=np.cos(vec_el)*np.cos(vec_az)
dy=np.cos(vec_el)*np.sin(vec_az)
dz=np.sin(vec_el)

b=255*(dx*uni_x+dy*uni_y+dz*uni_z)
b-b.clip(0,255)
im=Image.fromarray(b.astype('uint8'))
im.save('002.jpg')
