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Solve cropped image pdf import (#1068)

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This commit is contained in:
Ozzieisaacs 2019-10-22 19:11:40 +02:00
parent f758a1cc64
commit 5167ee520e
1 changed files with 57 additions and 5 deletions
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62
cps/uploader.py
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@ -20,6 +20,7 @@
from __future__ import division, print_function, unicode_literals
import os
import hashlib
import struct
from tempfile import gettempdir
from flask_babel import gettext as _
@ -148,6 +149,23 @@ def pdf_meta(tmp_file_path, original_file_name, original_file_extension):
def CMYKInvert(img):
return Image.merge(img.mode,[ImageOps.invert(b.convert('L')) for b in img.split()])
def tiff_header_for_CCITT(width, height, img_size, CCITT_group=4):
tiff_header_struct = '<' + '2s' + 'h' + 'l' + 'h' + 'hhll' * 8 + 'h'
return struct.pack(tiff_header_struct,
b'II', # Byte order indication: Little indian
42, # Version number (always 42)
8, # Offset to first IFD
8, # Number of tags in IFD
256, 4, 1, width, # ImageWidth, LONG, 1, width
257, 4, 1, height, # ImageLength, LONG, 1, lenght
258, 3, 1, 1, # BitsPerSample, SHORT, 1, 1
259, 3, 1, CCITT_group, # Compression, SHORT, 1, 4 = CCITT Group 4 fax encoding
262, 3, 1, 0, # Threshholding, SHORT, 1, 0 = WhiteIsZero
273, 4, 1, struct.calcsize(tiff_header_struct), # StripOffsets, LONG, 1, len of header
278, 4, 1, height, # RowsPerStrip, LONG, 1, lenght
279, 4, 1, img_size, # StripByteCounts, LONG, 1, size of image
0 # last IFD
)
def pdf_preview(tmp_file_path, tmp_dir):
if use_generic_pdf_cover:
@ -157,12 +175,14 @@ def pdf_preview(tmp_file_path, tmp_dir):
try:
input1 = PdfFileReader(open(tmp_file_path, 'rb'), strict=False)
page0 = input1.getPage(0)
mediaBox = page0['/MediaBox']
box = page0['/CropBox'] if '/CropBox' in page0 else mediaBox
xObject = page0['/Resources']['/XObject'].getObject()
for obj in xObject:
if xObject[obj]['/Subtype'] == '/Image':
size = (xObject[obj]['/Width'], xObject[obj]['/Height'])
data = xObject[obj]._data # xObject[obj].getData()
data = xObject[obj]._data
mode = "P"
if xObject[obj]['/ColorSpace'] == '/DeviceRGB':
mode = "RGB"
@ -180,20 +200,52 @@ def pdf_preview(tmp_file_path, tmp_dir):
img = open(cover_file_name, "wb")
img.write(data)
img.close()
# Post processing
img2 = Image.open(cover_file_name)
width, height = img2.size
if mode == 'CMYK':
img2 = Image.open(cover_file_name)# .convert('RGB')
img2 = CMYKInvert(img2)
img2.save(cover_file_name)
img2 = img2.crop((box[0]/mediaBox[2]*width,
box[1]/mediaBox[3]*height,
box[2]/mediaBox[2]*width,
box[3]/mediaBox[3]*height))
img2.save(cover_file_name)
return cover_file_name
elif xObject[obj]['/Filter'] == '/JPXDecode':
cover_file_name = os.path.splitext(tmp_file_path)[0] + ".cover.jp2"
img = open(cover_file_name, "wb")
img.write(data)
img.close()
# Post processing
img2 = Image.open(cover_file_name)
width, height = img2.size
if mode == 'CMYK':
img2 = Image.open(cover_file_name)# .convert('RGB')
img2 = CMYKInvert(img2)
img2.save(cover_file_name)
img2 = img2.crop((box[0]/mediaBox[2]*width,
box[1]/mediaBox[3]*height,
box[2]/mediaBox[2]*width,
box[3]/mediaBox[3]*height))
img2.save(cover_file_name)
return cover_file_name
elif xObject[obj]['/Filter'] == '/CCITTFaxDecode':
if xObject[obj]['/DecodeParms']['/K'] == -1:
CCITT_group = 4
else:
CCITT_group = 3
width = xObject[obj]['/Width']
height = xObject[obj]['/Height']
img_size = len(data)
tiff_header = tiff_header_for_CCITT(width, height, img_size, CCITT_group)
cover_file_name_tiff = os.path.splitext(tmp_file_path)[0] + obj[1:] + '.tiff'
cover_file_name = os.path.splitext(tmp_file_path)[0] + obj[1:] + '.jpg'
img = open(cover_file_name_tiff, "wb")
img.write(tiff_header + data)
img.close()
# Post processing
img2 = Image.open(cover_file_name_tiff)
if img2.mode == '1':
img2 = ImageOps.invert(img2.convert('RGB'))
img2.save(cover_file_name)
return cover_file_name
else:
img = Image.frombytes(mode, size, data)