how can we get rid of the blur in pygame image?

    
    import pygame as pygame , sys
    
    pygame.init()
    size = (700,500)
    window_game = pygame.display.set_mode(size)
    print(pygame.mouse.get_cursor())
    _run_ = True
    
    
    class mySprite(pygame.sprite.Sprite):
        def __init__ (self,width,height,cord_x,cord_y,color):
            super().__init__()
            self.image = pygame.Surface([width,height])
            self.image.fill(color)
            self.rect = self.image.get_rect()
            self.rect.center = [cord_x,cord_y]
#my background image
    bgimg = pygame.image.load("download.jpg")
    bgimg = pygame.transform.smoothscale(bgimg, size)
    
    placeSP = [mySprite(50,20,100,150,(10,205,120))]
    placeSP_group = pygame.sprite.Group()
    
    Clock = pygame.time.Clock()
    FPS = 240
    while _run_:
    
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.QUIT
                sys.exit()
            placeSP.append(mySprite(50,20,100,170,(10,25,0)))
        pygame.display.flip()
        window_game.blit(bgimg,(0,0))
        placeSP_group.draw(window_game)
        placeSP_group.add(placeSP[:])
        Clock.tick(FPS)

now the problem I have is that the download.jpg is 4k res and if I try to fit that image in my window the img is very blurry and i have also tried many more img but they were all blurry
do I try to get a picture of the window size or do i have to do something else pls tell me….