engine.py 文件源码

def save_image(image, destination=None, filename=None, **options):
    """
    Save a PIL image.
    """
    if destination is None:
        destination = BytesIO()
    filename = filename or ''
    # Ensure plugins are fully loaded so that Image.EXTENSION is populated.
    Image.init()
    format = Image.EXTENSION.get(os.path.splitext(filename)[1].lower(), 'JPEG')
    if format in ('JPEG', 'WEBP'):
        options.setdefault('quality', 85)
    saved = False
    if format == 'JPEG':
        if settings.THUMBNAIL_PROGRESSIVE and (
                max(image.size) >= settings.THUMBNAIL_PROGRESSIVE):
            options['progressive'] = True
        try:
            image.save(destination, format=format, optimize=1, **options)
            saved = True
        except IOError:
            # Try again, without optimization (PIL can't optimize an image
            # larger than ImageFile.MAXBLOCK, which is 64k by default). This
            # shouldn't be triggered very often these days, as recent versions
            # of pillow avoid the MAXBLOCK limitation.
            pass
    if not saved:
        image.save(destination, format=format, **options)
    if hasattr(destination, 'seek'):
        destination.seek(0)
    return destination