Using ReportLab to create a PDF from an image.

If you want to create a page in a PDF that contains an image that fills the entire page, here's a snippet that'll do exactly that. It requires PIL and ReportLab. Simply pass the function the path to an image and the canvas, and it'll fill the current page with the image (rotated properly including honoring EXIF orientation attributes).

Due to it handling EXIF orientation values, it's compatible with images taken from the camera of iPhone and iPad devices.

	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)

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