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import cStringIO | |
import PIL.Image | |
from ssim import compute_ssim | |
def get_ssim_at_quality(photo, quality): | |
"""Return the ssim for this JPEG image saved at the specified quality""" | |
ssim_photo = cStringIO.StringIO() | |
# optimize is omitted here as it doesn't affect | |
# quality but requires additional memory and cpu |
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FROM ubuntu:xenial | |
RUN apt-get update \ | |
&& DEBIAN_FRONTEND=noninteractive apt-get -y --no-install-recommends install \ | |
# build tools | |
nasm \ | |
build-essential \ | |
autoconf \ | |
automake \ | |
libtool \ |
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# do a typical thumbnail, preserving aspect ratio | |
new_photo = photo.copy() | |
new_photo.thumbnail( | |
(width, height), | |
resample=PIL.Image.ANTIALIAS, | |
) | |
thumbfile = cStringIO.StringIO() | |
save_args = {'format': format} | |
if format == 'JPEG': | |
save_args['quality'] = 85 |