【python】手绘图制作

 1 from PIL import Image
 2 import numpy as np
 3 vec_el = np.pi / 2.2  # 光源的俯视角度,弧度值
 4 vec_az = np.pi / 4.  # 光源的方位角度,弧度值
 5 depth = 10.  # (0-100)
 6 im = Image.open(‘555.jpg‘).convert(‘L‘)
 7 a = np.asarray(im).astype(‘float‘)
 8 grad = np.gradient(a)  # 取图像灰度的梯度值
 9 grad_x, grad_y = grad  # 分别取横纵图像梯度值
10 grad_x = grad_x * depth / 100.
11 grad_y = grad_y * depth / 100.
12 dx = np.cos(vec_el) * np.cos(vec_az)  # 光源对 x轴的影响
13 dy = np.cos(vec_el) * np.sin(vec_az)  # 光源对 y轴的影响
14 dz = np.sin(vec_el)  # 光源对z 轴的影响
15 A = np.sqrt(grad_x ** 2 + grad_y ** 2 + 1.)
16 uni_x = grad_x / A
17 uni_y = grad_y / A
18 uni_z = 1. / A
19 p = 255 * (dx * uni_x + dy * uni_y + dz * uni_z)  # 光源归一化
20 p = p.clip(0, 255)
21 im2 = Image.fromarray(p.astype(‘uint8‘))  # 重构图像
22 im2.save("666.jpg")