[Image-SIG] some trouble about jpeg encode in PIL

[feihu_roger]

nice, this is OK.
Thanks

> this is a known limitation; PIL uses the JPEG library's incremental encoding mode, but
> that doesn't work right in combination with progressive encoding, when the image is too
> large.  to work around this, you can
> 
> 1. fallback on non-progressive encoding when you get the above error
> 
>     try:
>         im.save(outfile, quality=90, progressive=1)
>     except IOError:
>         im.save(outfile, quality=90) # retry in non-progressive mode
> 
> and/or
> 
> 2. tweak the ImageFile.MAXBLOCK value before you save the image; you can either
> simply set it to something reasonably large (e.g. 256*1024 or even 1024*1024) up front:
> 
>      import ImageFile
> 
>      ImageFile.MAXBLOCK = 1024*1024
> 
> or bump the size only if you get the above error.


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