png，jpg图像在pygame中无法正确显示（mac osx pycharm / IDLE）

Question

recently started coding with python using pycharm / python IDLE on mac osx.

When it comes to showing / blitting images onto a defined pygame display, png and jpg formats don't appear properly (see images).

Only bmp formats appear properly.

Any suggestions to make jpg and png appear correctly in pygame?

Thank you

source jpg image

how it appears on pygame display

import pygame, sys
    from pygame.locals import *

    pygame.init()

    width = 640
    height = 480

    screen = pygame.display.set_mode((width,height))
    pygame.display.set_caption('hello piggy')

    white = (255,255,255)
    image = pygame.image.load("flpig.jpg")

    x=160
    y=120

    running = True

    while running:
        screen.fill(white)
        screen.blit(image, (x, y))

        for event in pygame.event.get():
            if event.type == QUIT:
                pygame.quit()
                sys.exit()

        pygame.display.update()

Answer 1

import pygame
from pygame.locals import*
img = pygame.image.load("flpig.jpg")
white = (255, 255, 255)
w = 640
h = 480
screen = pygame.display.set_mode((w, h))
screen.fill((white))
running = 1

while running:
 screen.fill((white))
 screen.blit(img,(0,0))
 pygame.display.flip()