CODEWITHSUNDEEP
pythonpython-imaging-librarytiff
David Wolever
David Wolever

Reputation: 154664

Python PIL incorrectly decoding TIFF colors (using incorrect colorspace)?

When I use PIL==1.1.7 to load TIFF images, it seems to get the colorspace wrong:

bad colorspace conversion

What's going on?

>>> from PIL import Image
>>> Image.DEBUG = True
>>> Image.open("/tmp/test.tiff").show()
tag: ImageWidth (256) - type: short (3) - value: (560,)
tag: ImageLength (257) - type: short (3) - value: (401,)
tag: BitsPerSample (258) - type: short (3) - value: (8, 8, 8)
tag: Compression (259) - type: short (3) - value: (7,)
tag: PhotometricInterpretation (262) - type: short (3) - value: (2,)
tag: FillOrder (266) - type: short (3) - value: (1,)
tag: DocumentName (269) - type: ascii (2) - value: /tmp/lemur.tiff
tag: StripOffsets (273) - type: long (4) - value: (8, 9282, 18712, 28312, 38000, 48730, 59052, 70406, 83010, 95978, 108967, 121029, 133136, 145555, 157411, 168289, 179433, 191157, 202954, 214664, 226914, 238919, 250547, 261871, 273282, 284453)
tag: Orientation (274) - type: short (3) - value: (1,)
tag: SamplesPerPixel (277) - type: short (3) - value: (3,)
tag: RowsPerStrip (278) - type: short (3) - value: (16,)
tag: StripByteCounts (279) - type: long (4) - value: (9274, 9430, 9600, 9688, 10730, 10322, 11354, 12604, 12968, 12989, 12062, 12107, 12419, 11856, 10878, 11144, 11724, 11797, 11710, 12250, 12005, 11628, 11324, 11411, 11171, 2541)
tag: XResolution (282) - type: rational (5) - value: ((1207959552, 16777216),)
tag: YResolution (283) - type: rational (5) - value: ((1207959552, 16777216),)
tag: PlanarConfiguration (284) - type: short (3) - value: (1,)
tag: ResolutionUnit (296) - type: short (3) - value: (1,)
tag: PageNumber (297) - type: short (3) - value: (0, 1)
tag: JPEGTables (347) - type: undefined (7) - value: ????C??

???}!1AQa"q2??#B??R??$3br?  
%&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz???????????????????????????????????????????????????????????????????????????
tag: YCbCrSubSampling (530) - type: short (3) - value: (2, 2)
*** Summary ***
- compression: jpeg
- photometric_interpretation: 2
- planar_configuration: 1
- fill_order: 1
- size: (560, 401)
format key: ('II', 2, 1, 1, (8, 8, 8), ())
- raw mode: RGB
- pil mode: RGB

Upvotes: 14

Views: 4214

Answers (1)

Vladimir Sinenko
Vladimir Sinenko

Reputation: 4667

This is most likely due to the fact that your TIFF images contain compressed JPEG data generated by Adobe Photoshop, that uses a special marker to indicate the correct colorspace. I guess PIL doesn't know this marker (at least, in a TIFF-embedded JPEG), so it assumes that the image is in YCbCr colorspace (which we can see on the screenshot).

See the detailed answer here, I believe it's exactly your case.

The possible solution for you is to convert your JPEGs with other methods (without compressed JPEG data). For example, if PIL manages to open your JPEGs correctly, you can rewrite the TIFF with PIL:

from PIL import Image
img = Image.open("test.jpg")
tif = Image.new("RGB", img.size)
tif.paste(img)
tif.save('result.tiff')

Upvotes: 12

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