Respect EXIF rotation tag of image (closes: !2)
Read the EXIF information from every input image and use it to correctly set the page rotation of the resulting PDF document page.
This commit is contained in:
Alexander Schlarb
parent
2faeb2005d
commit
a282692ac1
GPG key ID:
F2CBA5C78FBD83E1
1 changed files with 40 additions and 14 deletions
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@ -24,6 +24,7 @@ import zlib
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import argparse
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from PIL import Image, TiffImagePlugin
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#TiffImagePlugin.DEBUG = True
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from PIL.ExifTags import TAGS
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from datetime import datetime
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from jp2 import parsejp2
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from enum import Enum
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@ -419,7 +420,7 @@ class pdfdoc(object):
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def add_imagepage(self, color, imgwidthpx, imgheightpx, imgformat, imgdata,
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imgwidthpdf, imgheightpdf, imgxpdf, imgypdf, pagewidth,
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pageheight, userunit=None, palette=None, inverted=False,
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depth=0):
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depth=0, rotate=0):
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if self.with_pdfrw:
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from pdfrw import PdfDict, PdfName, PdfObject, PdfString
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from pdfrw.py23_diffs import convert_load
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@ -506,6 +507,8 @@ class pdfdoc(object):
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page[PdfName.MediaBox] = [0, 0, pagewidth, pageheight]
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page[PdfName.Resources] = resources
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page[PdfName.Contents] = content
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if rotate != 0:
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page[PdfName.Rotate] = rotate
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if userunit is not None:
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# /UserUnit requires PDF 1.6
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if self.writer.version < '1.6':
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@ -694,6 +697,29 @@ def get_imgmetadata(imgdata, imgformat, default_dpi, colorspace, rawdata=None):
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logging.debug("input dpi = %d x %d", *ndpi)
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rotation = 0
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if hasattr(imgdata, "_getexif") and imgdata._getexif() is not None:
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for tag, value in imgdata._getexif().items():
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if TAGS.get(tag, tag) == 'Orientation':
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# Detailed information on EXIF rotation tags:
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# http://impulseadventure.com/photo/exif-orientation.html
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if value == 1:
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rotation = 0
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elif value == 6:
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rotation = 90
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elif value == 3:
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rotation = 180
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elif value == 8:
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rotation = 270
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elif value in (2, 4, 5, 7):
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raise Exception("Image \"%s\": Unsupported flipped "
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"rotation mode (%d)"%(im.name, value))
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else:
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raise Exception("Image \"%s\": invalid rotation (%d)"%
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(im.name, value))
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logging.debug("rotation = %d°", rotation)
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if colorspace:
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color = colorspace
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logging.debug("input colorspace (forced) = %s", color)
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@ -727,7 +753,7 @@ def get_imgmetadata(imgdata, imgformat, default_dpi, colorspace, rawdata=None):
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logging.debug("width x height = %dpx x %dpx", imgwidthpx, imgheightpx)
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return (color, ndpi, imgwidthpx, imgheightpx)
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return (color, ndpi, imgwidthpx, imgheightpx, rotation)
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def ccitt_payload_location_from_pil(img):
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@ -842,7 +868,7 @@ def read_images(rawdata, colorspace, first_frame_only=False):
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# JPEG and JPEG2000 can be embedded into the PDF as-is
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if imgformat == ImageFormat.JPEG or imgformat == ImageFormat.JPEG2000:
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color, ndpi, imgwidthpx, imgheightpx = get_imgmetadata(
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color, ndpi, imgwidthpx, imgheightpx, rotation = get_imgmetadata(
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imgdata, imgformat, default_dpi, colorspace, rawdata)
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if color == Colorspace['1']:
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raise JpegColorspaceError("jpeg can't be monochrome")
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@ -853,7 +879,7 @@ def read_images(rawdata, colorspace, first_frame_only=False):
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im.close()
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logging.debug("read_images() embeds a JPEG")
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return [(color, ndpi, imgformat, rawdata, imgwidthpx, imgheightpx, [],
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False, 8)]
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False, 8, rotation)]
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# We can directly embed the IDAT chunk of PNG images if the PNG is not
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# interlaced
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@ -863,7 +889,7 @@ def read_images(rawdata, colorspace, first_frame_only=False):
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# IHDR chunk. We know where to find that in the file because the IHDR chunk
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# must be the first chunk.
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if imgformat == ImageFormat.PNG and rawdata[28] == 0:
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color, ndpi, imgwidthpx, imgheightpx = get_imgmetadata(
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color, ndpi, imgwidthpx, imgheightpx, rotation = get_imgmetadata(
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imgdata, imgformat, default_dpi, colorspace, rawdata)
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pngidat, palette = parse_png(rawdata)
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im.close()
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@ -876,7 +902,7 @@ def read_images(rawdata, colorspace, first_frame_only=False):
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raise ValueError("invalid bit depth: %d" % depth)
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logging.debug("read_images() embeds a PNG")
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return [(color, ndpi, imgformat, pngidat, imgwidthpx, imgheightpx,
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palette, False, depth)]
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palette, False, depth, rotation)]
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# If our input is not JPEG or PNG, then we might have a format that
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# supports multiple frames (like TIFF or GIF), so we need a loop to
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@ -925,7 +951,7 @@ def read_images(rawdata, colorspace, first_frame_only=False):
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elif photo != 1:
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raise ValueError("unsupported photometric interpretation for "
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"group4 tiff: %d" % photo)
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color, ndpi, imgwidthpx, imgheightpx = get_imgmetadata(
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color, ndpi, imgwidthpx, imgheightpx, rotation = get_imgmetadata(
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imgdata, imgformat, default_dpi, colorspace, rawdata)
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offset, length = ccitt_payload_location_from_pil(imgdata)
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im.seek(offset)
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@ -948,13 +974,13 @@ def read_images(rawdata, colorspace, first_frame_only=False):
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raise ValueError("unsupported FillOrder: %d" % fillorder)
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logging.debug("read_images() embeds Group4 from TIFF")
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result.append((color, ndpi, ImageFormat.CCITTGroup4, rawdata,
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imgwidthpx, imgheightpx, [], inverted, 1))
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imgwidthpx, imgheightpx, [], inverted, 1, rotation))
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img_page_count += 1
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continue
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logging.debug("Converting frame: %d" % img_page_count)
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color, ndpi, imgwidthpx, imgheightpx = get_imgmetadata(
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color, ndpi, imgwidthpx, imgheightpx, rotation = get_imgmetadata(
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imgdata, imgformat, default_dpi, colorspace)
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newimg = None
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@ -964,7 +990,7 @@ def read_images(rawdata, colorspace, first_frame_only=False):
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logging.debug(
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"read_images() encoded a B/W image as CCITT group 4")
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result.append((color, ndpi, ImageFormat.CCITTGroup4, ccittdata,
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imgwidthpx, imgheightpx, [], False, 1))
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imgwidthpx, imgheightpx, [], False, 1, rotation))
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img_page_count += 1
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continue
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except Exception as e:
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@ -985,7 +1011,7 @@ def read_images(rawdata, colorspace, first_frame_only=False):
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imggz = zlib.compress(newimg.tobytes())
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logging.debug("read_images() encoded CMYK with flate compression")
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result.append((color, ndpi, imgformat, imggz, imgwidthpx,
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imgheightpx, [], False, 8))
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imgheightpx, [], False, 8, rotation))
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else:
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# cheapo version to retrieve a PNG encoding of the payload is to
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# just save it with PIL. In the future this could be replaced by
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@ -1003,7 +1029,7 @@ def read_images(rawdata, colorspace, first_frame_only=False):
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raise ValueError("invalid bit depth: %d" % depth)
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logging.debug("read_images() encoded an image as PNG")
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result.append((color, ndpi, ImageFormat.PNG, pngidat, imgwidthpx,
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imgheightpx, palette, False, depth))
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imgheightpx, palette, False, depth, rotation))
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img_page_count += 1
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# the python-pil version 2.3.0-1ubuntu3 in Ubuntu does not have the
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# close() method
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@ -1319,7 +1345,7 @@ def convert(*images, **kwargs):
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rawdata = img
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for color, ndpi, imgformat, imgdata, imgwidthpx, imgheightpx, \
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palette, inverted, depth in read_images(
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palette, inverted, depth, rotation in read_images(
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rawdata, kwargs['colorspace'], kwargs['first_frame_only']):
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pagewidth, pageheight, imgwidthpdf, imgheightpdf = \
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kwargs['layout_fun'](imgwidthpx, imgheightpx, ndpi)
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@ -1344,7 +1370,7 @@ def convert(*images, **kwargs):
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pdf.add_imagepage(color, imgwidthpx, imgheightpx, imgformat,
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imgdata, imgwidthpdf, imgheightpdf, imgxpdf,
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imgypdf, pagewidth, pageheight, userunit,
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palette, inverted, depth)
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palette, inverted, depth, rotation)
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if kwargs['outputstream']:
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pdf.tostream(kwargs['outputstream'])
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