Returns an image in the request format

def format_image(self, image, image_format, **kwargs):
        """Returns an image in the request format"""

        image_format = image_format.lower()
        accept = self.request.META['HTTP_ACCEPT'].split(',')

        if FORCE_WEBP and 'image/webp' in accept:
            image_format = 'webp'
        elif image_format == 'png8':
            alpha = image.split()[-1]
            image = image.convert('RGB')
            image = image.convert('P', palette=Image.ADAPTIVE, colors=255)
            image.paste(255, Image.eval(alpha, lambda x: 255 if x <= 128 else 0))
            image_format = 'png'
            kwargs['transparency'] = 255
        elif image_format in ('png32', 'png24'):
            image_format = 'png'

        return super(GetImageView, self).format_image(image, image_format, **kwargs)