Fill a page with an image with ReportLab and PIL

gistfile1.py

def fill_page_with_image(path, canvas):
    """
    Given the path to an image and a reportlab canvas, fill the current page
    with the image.
    
    This function takes into consideration EXIF orientation information (making
    it compatible with photos taken from iOS devices).
    
    This function makes use of ``canvas.setPageRotation()`` and
    ``canvas.setPageSize()`` which will affect subsequent pages, so be sure to
    reset them to appropriate values after calling this function.
    
    :param   path: filesystem path to an image
    :param canvas: ``reportlab.canvas.Canvas`` object
    """
    from PIL import Image

    page_width, page_height = canvas._pagesize

    image = Image.open(path)
    image_width, image_height = image.size
    if hasattr(image, '_getexif'):
        orientation = image._getexif().get(274, 1)  # 274 = Orientation
    else:
        orientation = 1

    # These are the possible values for the Orientation EXIF attribute:
    ORIENTATIONS = {
        1: "Horizontal (normal)",
        2: "Mirrored horizontal",
        3: "Rotated 180",
        4: "Mirrored vertical",
        5: "Mirrored horizontal then rotated 90 CCW",
        6: "Rotated 90 CW",
        7: "Mirrored horizontal then rotated 90 CW",
        8: "Rotated 90 CCW",
    }
    draw_width, draw_height = page_width, page_height
    if orientation == 1:
        canvas.setPageRotation(0)
    elif orientation == 3:
        canvas.setPageRotation(180)
    elif orientation == 6:
        image_width, image_height = image_height, image_width
        draw_width, draw_height = page_height, page_width
        canvas.setPageRotation(90)
    elif orientation == 8:
        image_width, image_height = image_height, image_width
        draw_width, draw_height = page_height, page_width
        canvas.setPageRotation(270)
    else:
        raise ValueError("Unsupported image orientation '%s'."
                         % ORIENTATIONS[orientation])

    if image_width > image_height:
        page_width, page_height = page_height, page_width  # flip width/height
        draw_width, draw_height = draw_height, draw_width
        canvas.setPageSize((page_width, page_height))

    canvas.drawImage(path, 0, 0, width=draw_width, height=draw_height,
                     preserveAspectRatio=True)