先来张对比图

然后直接上代码：

#图片转手绘风
from PIL import Image
import numpy as np
a = np.asarray(Image.open("绝对路径/a.jpg").convert("L")).astype("float") 
#注意python中路径要用"/"(正斜杠)，反斜杠被python识别为转义符号
depth = 10  #设置深度为10
grad = np.gradient(a)   #对数组a求梯度
grad_x, grad_y = grad
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  #θ角度
vec_az = np.pi/4.   #α角度
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("绝对路径/hand_drawing.jpg")

ps：

记得安装PIL和numpy的库 😃