issue_comments: 624408738

Here's rendering code from my hacked-together not-yet-released S3 image proxy: ```python from starlette.responses import Response from PIL import Image, ExifTags import pyheif

for ORIENTATION_TAG in ExifTags.TAGS.keys(): if ExifTags.TAGS[ORIENTATION_TAG] == "Orientation": break ... # Load it into Pillow if ext == "heic": heic = pyheif.read_heif(image_response.content) image = Image.frombytes(mode=heic.mode, size=heic.size, data=heic.data) else: image = Image.open(io.BytesIO(image_response.content))

# Does EXIF tell us to rotate it?
try:
    exif = dict(image._getexif().items())
    if exif[ORIENTATION_TAG] == 3:
        image = image.rotate(180, expand=True)
    elif exif[ORIENTATION_TAG] == 6:
        image = image.rotate(270, expand=True)
    elif exif[ORIENTATION_TAG] == 8:
        image = image.rotate(90, expand=True)
except (AttributeError, KeyError, IndexError):
    pass

# Resize based on ?w= and ?h=, if set
width, height = image.size
w = request.query_params.get("w")
h = request.query_params.get("h")
if w is not None or h is not None:
    if h is None:
        # Set h based on w
        w = int(w)
        h = int((float(height) / width) * w)
    elif w is None:
        h = int(h)
        # Set w based on h
        w = int((float(width) / height) * h)
    w = int(w)
    h = int(h)
    image.thumbnail((w, h))

# ?bw= converts to black and white
if request.query_params.get("bw"):
    image = image.convert("L")

# ?q= sets the quality - defaults to 75
quality = 75
q = request.query_params.get("q")
if q and q.isdigit() and 1 <= int(q) <= 100:
    quality = int(q)

# Output as JPEG or PNG
output_image = io.BytesIO()
image_type = "JPEG"
kwargs = {"quality": quality}
if image.format == "PNG":
    image_type = "PNG"
    kwargs = {}

image.save(output_image, image_type, **kwargs)
return Response(
    output_image.getvalue(),
    media_type="image/jpeg",
    headers={"cache-control": "s-maxage={}, public".format(365 * 24 * 60 * 60)},
)

```