[Python] Convert png to jpeg using Pillow

I am trying to convert png to jpeg using pillow. I've tried several scrips without success. These 2 seemed to work on small png images like this one.



First code:

from PIL import Image
import os, sys

im = Image.open("Ba_b_do8mag_c6_big.png")
bg = Image.new("RGB", im.size, (255,255,255))
bg.paste(im,im)
bg.save("colors.jpg")


Second code:

image = Image.open('Ba_b_do8mag_c6_big.png')
bg = Image.new('RGBA',image.size,(255,255,255))
bg.paste(image,(0,0),image)
bg.save("test.jpg", quality=95)


But if I try to convert a bigger image like this one



I'm getting

Traceback (most recent call last):
File "png_converter.py", line 14, in <module>
bg.paste(image,(0,0),image)
File "/usr/lib/python2.7/dist-packages/PIL/Image.py", line 1328, in paste
self.im.paste(im, box, mask.im) ValueError: bad transparency mask


What am i doing wrong?

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