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Do not use CCITTFaxDecode filter if libtiff is not available

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This commit is contained in:
Andrew Murray 2022-08-22 19:57:33 +10:00
parent 4c59f77e37
commit 3b4ea7c602
2 changed files with 20 additions and 17 deletions
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4
Tests/test_file_pdf.py
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@ -6,7 +6,7 @@ import time
import pytest
from PIL import Image, PdfParser
from PIL import Image, PdfParser, features
from .helper import hopper, mark_if_feature_version
@ -43,7 +43,7 @@ def test_monochrome(tmp_path):
# Act / Assert
outfile = helper_save_as_pdf(tmp_path, mode)
assert os.path.getsize(outfile) < 5000
assert os.path.getsize(outfile) < (5000 if features.check("libtiff") else 15000)
def test_greyscale(tmp_path):

5
src/PIL/PdfImagePlugin.py
View File

@ -25,7 +25,7 @@ import math
import os
import time
from . import Image, ImageFile, ImageSequence, PdfParser, __version__
from . import Image, ImageFile, ImageSequence, PdfParser, __version__, features
#
# --------------------------------------------------------------------
@ -130,6 +130,7 @@ def _save(im, fp, filename, save_all=False):
width, height = im.size
if im.mode == "1":
if features.check("libtiff"):
filter = "CCITTFaxDecode"
bits = 1
params = PdfParser.PdfArray(
@ -144,6 +145,8 @@ def _save(im, fp, filename, save_all=False):
)
]
)
else:
filter = "DCTDecode"
colorspace = PdfParser.PdfName("DeviceGray")
procset = "ImageB" # grayscale
elif im.mode == "L":