手绘风

from PIL import Image
a = np.array(Image.open(r'tatong.jpg').convert('L')).astype('float')
depth = 10.
grad = np.gradient(a)
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_ez = np.pi/4.
dx = np.cos(vec_el)*np.cos(vec_ez)
dy = np.cos(vec_el)*np.sin(vec_ez)
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('手绘.jpg')