Python 实现图像手绘效果

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from PIL import Image
import numpy as np
out1 = np.asarray(Image.open("D:/pictures/yinghua.jpg").convert('L')).astype('float')
depth = 10.
grad = np.gradient(out1)
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
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("D:/pictures/9.jpg")

效果如下：