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输入图片名时要把图片格式也带着。要把代码文件与图片保存到同一个路径。

from PIL import Image
import matplotlib.pyplot as plt
import collections

def RGB(file):
    pic = Image.open(file).convert("RGB") 
    width,height = pic.size
    block = 10
    #piece  = pic.crop((width/2-10/2,height/2-10/2,width/2+10/2,height/2+10/2))

    #piece.show()
    board = Image.new("RGB",pic.size)

    for y in range(0,height,block):
        for x in range(0,width,block):
            temp = pic.crop((x,y,x+block,y+block))
            #temp.show()
            temp_list = list(temp.getdata())
            max_color = collections.Counter(temp_list).most_common()[0][0]
            temp_past = Image.new("RGB",temp.size,max_color)
            print(max_color)
            board.paste(temp_past,(x,y))
            # plt.imshow(board)
            # plt.pause(0.01)

    board.show()   

file_1 = input("请输入图片名称：",)
#file = file_1 + ".png"
RGB(file_1)