本文用 Python 實現(xiàn) PS 濾鏡中的 USM 銳化效果

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# 飽和處理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()

實現(xiàn)效果：

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