Python: PS 滤镜--USM 锐化

本文用 Python 实现 PS 滤镜中的 USM 锐化效果，具体的算法原理和效果可以参考之前的博客：

http://blog.csdn.net/matrix_space/article/details/51169960

import matplotlib.pyplot as pltfrom skimage import iofrom skimage.filters import gaussianfile_name='D:/Visual Effects/PS Algorithm/4.jpg';img=io.imread(file_name)img = img * 1.0gauss_out = gaussian(img, sigma=5, multichannel=True)# alpha 0 - 5alpha = 1.5img_out = (img - gauss_out) * alpha + imgimg_out = img_out/255.0# 饱和处理mask_1 = img_out  < 0 mask_2 = img_out  > 1img_out = img_out * (1-mask_1)img_out = img_out * (1-mask_2) + mask_2plt.figure()plt.imshow(img/255.0)plt.axis('off')plt.figure(2)plt.imshow(img_out)plt.axis('off')plt.show()