每隔一个4x4像素方格隔开一个像素

4px.py

from PIL import Image
import numpy as np
# import matplotlib.pyplot as plt

img_array = np.array(Image.open('t3.png').convert('RGBA'))

w = img_array.shape[0] # 获取图片宽度
h = img_array.shape[1] # 获取图片高度

# 根据原图尺寸放大创建一个放大后的图片
# new_array = np.zeros((round(h/4)+h, round(w/4)+w, 4), dtype=np.uint8)
new_array = np.zeros((600, 600, 4), dtype=np.uint8)
# round 用于四舍五入,否则如果是奇数的照片尺寸会导致出错.


xadd = 0
for x in range(0,img_array.shape[0]):
    yadd = 0

    if x % 4 == 0 and x != 0:
        xadd += 1

    for y in range(0,img_array.shape[1]):

        if y % 4 == 0 and y != 0:  # 遇到整除4的像素点就偏移1px
            yadd += 1
            new_array[x + xadd ,y + yadd] = img_array[x, y]
        else:
            new_array[x + xadd ,y + yadd] = img_array[x, y]



# plt.figure("4px")
# plt.imshow(new_array)
# plt.axis('off')
# plt.show()
new_img = Image.fromarray(new_array, 'RGBA')
new_img.save('t3+1.png')
new_img.show()

脚本用途如上。