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Store TIFF DPI as integer

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This commit is contained in:
nathanf 2016-08-15 17:49:16 -07:00
parent f12febf3a9
commit 9e5650914c
2 changed files with 17 additions and 2 deletions
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5
PIL/TiffImagePlugin.py
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@ -52,6 +52,7 @@ from numbers import Number, Rational
import io import io
import itertools import itertools
import math
import os import os
import struct import struct
import sys import sys
@ -1154,9 +1155,9 @@ class TiffImageFile(ImageFile.ImageFile):
if xres and yres: if xres and yres:
resunit = self.tag_v2.get(RESOLUTION_UNIT, 1) resunit = self.tag_v2.get(RESOLUTION_UNIT, 1)
if resunit == 2: # dots per inch if resunit == 2: # dots per inch
self.info["dpi"] = xres, yres self.info["dpi"] = int(math.ceil(xres)), int(math.ceil(yres))
elif resunit == 3: # dots per centimeter. convert to dpi elif resunit == 3: # dots per centimeter. convert to dpi
self.info["dpi"] = xres * 2.54, yres * 2.54 self.info["dpi"] = int(math.ceil(xres * 2.54)), int(math.ceil(yres * 2.54))
else: # No absolute unit of measurement else: # No absolute unit of measurement
self.info["resolution"] = xres, yres self.info["resolution"] = xres, yres

14
Tests/test_file_tiff.py
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@ -470,6 +470,20 @@ class TestFileTiff(PillowTestCase):
im = Image.open(infile) im = Image.open(infile)
self.assertEqual(im.getpixel((0, 0)), pixel_value) self.assertEqual(im.getpixel((0, 0)), pixel_value)
def test_save_tiff_with_dpi(self):
outfile = self.tempfile("temp.tif")
infile = "Tests/images/hopper.tif"
im = Image.open(infile)
im.save(outfile, 'JPEG', dpi=im.info['dpi'])
reloaded = Image.open(outfile)
reloaded.load()
self.assertEqual(im.info['dpi'], reloaded.info['dpi'])
if __name__ == '__main__': if __name__ == '__main__':
unittest.main() unittest.main()