How to save progressive jpeg using Python PIL 1.1.7?

Question

I'm trying to save with the following call and it raises error, but if i remove progressive and optimize options, it saves.

Here is my test.py that doesn't work:

import Image img = Image.open("in.jpg") img.save("out.jpg", "JPEG", quality=80, optimize=True, progressive=True) 

It raises this error:

Suspension not allowed here Traceback (most recent call last):   File "test.py", line 3, in <module>     img.save("out.jpg", "JPEG", quality=80, optimize=True, progressive=True)   File "/Library/Python/2.6/site-packages/PIL/Image.py", line 1439, in save     save_handler(self, fp, filename)   File "/Library/Python/2.6/site-packages/PIL/JpegImagePlugin.py", line 471, in _save     ImageFile._save(im, fp, [("jpeg", (0,0)+im.size, 0, rawmode)])   File "/Library/Python/2.6/site-packages/PIL/ImageFile.py", line 501, in _save     raise IOError("encoder error %d when writing image file" % s) IOError: encoder error -2 when writing image file 

Link to image: http://static.cafe.nov.ru/in.jpg (4.3 mb)

Answer 1

import PIL from exceptions import IOError  img = PIL.Image.open("c:\\users\\adam\\pictures\\in.jpg") destination = "c:\\users\\adam\\pictures\\test.jpeg" try:     img.save(destination, "JPEG", quality=80, optimize=True, progressive=True) except IOError:     PIL.ImageFile.MAXBLOCK = img.size[0] * img.size[1]     img.save(destination, "JPEG", quality=80, optimize=True, progressive=True) 

PIL encodes part of the image at a time. This is incompatible with the 'optimize' and 'progressive' options.

Edit: You need to import PIL.Image, PIL.ImageFile for newer versions of PIL / Pillow.

Answer 2

Here's a hack that might work, but you may need to make the buffer even larger:

from PIL import Image, ImageFile  ImageFile.MAXBLOCK = 2**20  img = Image.open("in.jpg") img.save("out.jpg", "JPEG", quality=80, optimize=True, progressive=True)