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Merge pull request #5514 from kmilos/fix_tiff_rowsperstrip

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Hugo van Kemenade 2021-06-30 17:31:42 +03:00 committed by GitHub
commit 861a031304
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2 changed files with 24 additions and 5 deletions
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11
Tests/test_file_libtiff.py
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@ -9,7 +9,7 @@ from ctypes import c_float
import pytest
from PIL import Image, ImageFilter, TiffImagePlugin, TiffTags, features
from PIL.TiffImagePlugin import SUBIFD
from PIL.TiffImagePlugin import STRIPOFFSETS, SUBIFD
from .helper import (
assert_image_equal,
@ -967,3 +967,12 @@ class TestFileLibTiff(LibTiffTestCase):
# Assert that the error code is IMAGING_CODEC_MEMORY
assert str(e.value) == "-9"
TiffImagePlugin.READ_LIBTIFF = False
def test_save_multistrip(self, tmp_path):
im = hopper("RGB").resize((256, 256))
out = str(tmp_path / "temp.tif")
im.save(out, compression="tiff_adobe_deflate")
with Image.open(out) as im:
# Assert that there are multiple strips
assert len(im.tag_v2[STRIPOFFSETS]) > 1

18
src/PIL/TiffImagePlugin.py
View File

@ -1574,12 +1574,22 @@ def _save(im, fp, filename):
ifd[COLORMAP] = tuple(v * 256 for v in lut)
# data orientation
stride = len(bits) * ((im.size[0] * bits[0] + 7) // 8)
ifd[ROWSPERSTRIP] = im.size[1]
strip_byte_counts = stride * im.size[1]
# aim for 64 KB strips when using libtiff writer
if libtiff:
rows_per_strip = min((2 ** 16 + stride - 1) // stride, im.size[1])
else:
rows_per_strip = im.size[1]
strip_byte_counts = stride * rows_per_strip
strips_per_image = (im.size[1] + rows_per_strip - 1) // rows_per_strip
ifd[ROWSPERSTRIP] = rows_per_strip
if strip_byte_counts >= 2 ** 16:
ifd.tagtype[STRIPBYTECOUNTS] = TiffTags.LONG
ifd[STRIPBYTECOUNTS] = strip_byte_counts
ifd[STRIPOFFSETS] = 0 # this is adjusted by IFD writer
ifd[STRIPBYTECOUNTS] = (strip_byte_counts,) * (strips_per_image - 1) + (
stride * im.size[1] - strip_byte_counts * (strips_per_image - 1),
)
ifd[STRIPOFFSETS] = tuple(
range(0, strip_byte_counts * strips_per_image, strip_byte_counts)
) # this is adjusted by IFD writer
# no compression by default:
ifd[COMPRESSION] = COMPRESSION_INFO_REV.get(compression, 1)