开罗为什么会弄乱我的颜色？

import cairo
from PIL import Image as im

orig_image = im.open(\'Camilla_Belle_photo_3.jpg\') #http://i56.tinypic.com/261i5cn.jpg
surface = cairo.ImageSurface.create_from_png(\'Camilla_Belle_photo_3.png\') #http://i52.tinypic.com/20gmypv.png
context = cairo.Context(surface)
#draw stuff
other_image = im.frombuffer(\'RGBA\', orig_image.size, surface.get_data(), \'raw\', \'RGBA\', 0, 1)
other_image.save(\'test.png\') #resulting image: http://i51.tinypic.com/farns.png

import cairo
from PIL import Image as im

surface = cairo.ImageSurface.create_from_png(\'Camilla_Belle_photo_3.png\') 
context = cairo.Context(surface)
#draw stuff
size = surface.get_width(), surface.get_height()
other_image = im.frombuffer(\'RGBA\', size, surface.get_data(), \'raw\', \'BGRA\', 0, 1)
other_image.save(\'test.png\')