[Image-SIG] python PIL 16-bit tiff files
Sebastian Haase
seb.haase at gmail.com
Mon Apr 12 14:34:52 CEST 2010
Dan,
My point was also, that I would doubt that there is physically(!) more
information than 16e6 possible values per pixel.
A digital gray scale CCD camera with more than 12 bits costs multiple
1000s of Euros or Dollars...
Maybe you could use imagemagick to convert 1 16bit RGB into 3 16bit
gray images and read those into PIL.
Can I ask what your overall intend with all of this is ?
Cheers,
Sebastian
On Mon, Apr 12, 2010 at 1:42 PM, Dan Blacker <dan.blacker at googlemail.com> wrote:
> Hi Sebastian,
>
> Yes I am scanning film and need to retain the as much of the color
> information as possble, so 16bit is essential.
>
> Could I perhaps do a convert with imagemagick - that would turn it into a
> 16bit tif file that PIL could read properly?
>
> Cheers,
> Dan
>
>
>
>
>
> On 12 April 2010 12:32, Sebastian Haase <seb.haase at gmail.com> wrote:
>>
>> Hi,
>>
>> are you sure it makes even sense to save a 16-bit RGB image ? This is
>> not meant as an excuse for PIL to not support it,
>> but 16mio colors should likely be enough for any application (i.e.
>> 8bit per R,G and B)
>>
>> Regards,
>> Sebastian Haase
>>
>>
>> On Mon, Apr 12, 2010 at 10:33 AM, Dan Blacker
>> <dan.blacker at googlemail.com> wrote:
>> > Hi Sebastian,
>> >
>> > Thanks so much for having a look at this,
>> >
>> > The image file is actually from an Epson v700 scanner, scanned using
>> > Vuescan
>> > in Ubuntu.
>> >
>> > It is an RGB image, not a grayscale one.
>> >
>> > Do you think I will be able to use this image with PIL? WIll I need to
>> > patch
>> > my version?
>> >
>> > Thanks again,
>> > Dan
>> >
>> >
>> >
>> >
>> >
>> > On 12 April 2010 08:37, Sebastian Haase <seb.haase at gmail.com> wrote:
>> >>
>> >> Hi Dan,
>> >>
>> >> I'm running a patched version of PIL 1.1.6 and could open all (I
>> >> thought) 16-bit TIF images in the past.
>> >> But with yours I also got
>> >> IOError("cannot identify image file")
>> >>
>> >> To find out what the problem is I used ImageMagick
>> >> $: identify Download/16_bit_example.tif
>> >> Download/16_bit_example.tif TIFF 318x336 318x336+0+0 16-bit
>> >> DirectClass 645KB 0.000u 0:00.010
>> >>
>> >> So far this look fine.
>> >> But trying to use PIL's TIF module directly, I find:
>> >> >>> import TiffImagePlugin
>> >> >>> fp = open("/home/shaase/Download/16_bit_example.tif")
>> >> >>>
>> >> >>>
>> >> >>> TiffImagePlugin.TiffImageFile(fp,"/home/shaase/Download/16_bit_example.tif")
>> >> Traceback (most recent call last):
>> >> File "<input>", line 1, in <module>
>> >> File "./PIL/ImageFile.py", line 82, in __init__
>> >> self._open()
>> >> File "./PIL/TiffImagePlugin.py", line 507, in _open
>> >> self._seek(0)
>> >> File "./PIL/TiffImagePlugin.py", line 535, in _seek
>> >> self._setup()
>> >> File "./PIL/TiffImagePlugin.py", line 613, in _setup
>> >> raise SyntaxError, "unknown pixel mode"
>> >> >>> pdb.pm()
>> >> (Pdb) p key
>> >> ('l', 2, 1, 1, (16, 16, 16), ())
>> >>
>> >> Aha, PIL thinks it's an 16-bit RGB image - i.e. not grayscale.
>> >> Is this correct ?
>> >>
>> >> Just for reference, I will paste my list of recognized "key"s below,
>> >> maybe someone knows what line would have to be added to support your
>> >> file.
>> >>
>> >> Cheers,
>> >> Sebastian Haase
>> >>
>> >> PS: Did you get this file by any chance from a Zeiss Microscope LSM
>> >> image ? - I just saw that I tried this in the past ...
>> >>
>> >> <code from patched 1.1.6
>> >>
>> >>
>> >> TiffImagePlugin.py---------------------------------------------------------------------------------->
>> >>
>> >> OPEN_INFO = {
>> >> # (ByteOrder, PhotoInterpretation, SampleFormat, FillOrder,
>> >> BitsPerSample,
>> >> # ExtraSamples) => mode, rawmode
>> >> ('l', 0, 1, 1, (1,), ()): ("1", "1;I"),
>> >> ('l', 0, 1, 2, (1,), ()): ("1", "1;IR"),
>> >> ('l', 0, 1, 1, (8,), ()): ("L", "L;I"),
>> >> ('l', 0, 1, 2, (8,), ()): ("L", "L;IR"),
>> >> ('l', 1, 1, 1, (1,), ()): ("1", "1"),
>> >> ('l', 1, 1, 2, (1,), ()): ("1", "1;R"),
>> >> ('l', 1, 1, 1, (8,), ()): ("L", "L"),
>> >> ('l', 1, 1, 1, (8,8), (2,)): ("LA", "LA"),
>> >> ('l', 1, 1, 2, (8,), ()): ("L", "L;R"),
>> >> ('l', 1, 1, 1, (16,), ()): ("I;16", "I;16"),
>> >> ('l', 1, 2, 1, (16,), ()): ("I;16S", "I;16S"),
>> >> ('l', 1, 2, 1, (32,), ()): ("I", "I;32S"),
>> >> ('l', 1, 3, 1, (32,), ()): ("F", "F;32F"),
>> >> ('l', 2, 1, 1, (8,8,8), ()): ("RGB", "RGB"),
>> >> ('l', 2, 1, 1, (8,8,0), ()): ("RGB", "RGB"),#seb -- found in
>> >> LSM(Zeiss) files
>> >> #('l', 2, 1, 1, (16,16,16), ()): ("RGB", "RGB"),#seb -- found in
>> >> LSM(Zeiss) files
>> >> ('l', 2, 1, 2, (8,8,8), ()): ("RGB", "RGB;R"),
>> >> #seb jeff's ('l', 2, 1, 1, (8,8,8,8), ()): ("RGBX", "RGBX"),#seb
>> >> -- found in LSM(Zeiss) files
>> >> ('l', 2, 1, 1, (8,8,8,8), (0,)): ("RGBX", "RGBX"),
>> >> ('l', 2, 1, 1, (8,8,8,8), (1,)): ("RGBA", "RGBa"),
>> >> ('l', 2, 1, 1, (8,8,8,8), (2,)): ("RGBA", "RGBA"),
>> >> ('l', 2, 1, 1, (8,8,8,8), (999,)): ("RGBA", "RGBA"), # corel draw 10
>> >> ('l', 3, 1, 1, (1,), ()): ("P", "P;1"),
>> >> ('l', 3, 1, 2, (1,), ()): ("P", "P;1R"),
>> >> ('l', 3, 1, 1, (2,), ()): ("P", "P;2"),
>> >> ('l', 3, 1, 2, (2,), ()): ("P", "P;2R"),
>> >> ('l', 3, 1, 1, (4,), ()): ("P", "P;4"),
>> >> ('l', 3, 1, 2, (4,), ()): ("P", "P;4R"),
>> >> ('l', 3, 1, 1, (8,), ()): ("P", "P"),
>> >> ('l', 3, 1, 1, (8,8), (2,)): ("PA", "PA"),
>> >> ('l', 3, 1, 2, (8,), ()): ("P", "P;R"),
>> >> ('l', 5, 1, 1, (8,8,8,8), ()): ("CMYK", "CMYK"),
>> >> ('l', 6, 1, 1, (8,8,8), ()): ("YCbCr", "YCbCr"),
>> >> ('l', 8, 1, 1, (8,8,8), ()): ("LAB", "LAB"),
>> >>
>> >> ('b', 0, 1, 1, (1,), ()): ("1", "1;I"),
>> >> ('b', 0, 1, 2, (1,), ()): ("1", "1;IR"),
>> >> ('b', 0, 1, 1, (8,), ()): ("L", "L;I"),
>> >> ('b', 0, 1, 2, (8,), ()): ("L", "L;IR"),
>> >> ('b', 1, 1, 1, (1,), ()): ("1", "1"),
>> >> ('b', 1, 1, 2, (1,), ()): ("1", "1;R"),
>> >> ('b', 1, 1, 1, (8,), ()): ("L", "L"),
>> >> ('b', 1, 1, 1, (8,8), (2,)): ("LA", "LA"),
>> >> ('b', 1, 1, 2, (8,), ()): ("L", "L;R"),
>> >> ('b', 1, 1, 1, (16,), ()): ("I;16B", "I;16B"),
>> >> ('b', 1, 2, 1, (16,), ()): ("I;16BS", "I;16BS"),
>> >> ('b', 1, 2, 1, (32,), ()): ("I;32BS", "I;32BS"),
>> >> ('b', 1, 3, 1, (32,), ()): ("F;32BF", "F;32BF"),
>> >> ('b', 2, 1, 1, (8,8,8), ()): ("RGB", "RGB"),
>> >> ('b', 2, 1, 2, (8,8,8), ()): ("RGB", "RGB;R"),
>> >> ('b', 2, 1, 1, (8,8,8,8), (0,)): ("RGBX", "RGBX"),
>> >> ('b', 2, 1, 1, (8,8,8,8), (1,)): ("RGBA", "RGBa"),
>> >> ('b', 2, 1, 1, (8,8,8,8), (2,)): ("RGBA", "RGBA"),
>> >> ('b', 2, 1, 1, (8,8,8,8), (999,)): ("RGBA", "RGBA"), # corel draw 10
>> >> ('b', 3, 1, 1, (1,), ()): ("P", "P;1"),
>> >> ('b', 3, 1, 2, (1,), ()): ("P", "P;1R"),
>> >> ('b', 3, 1, 1, (2,), ()): ("P", "P;2"),
>> >> ('b', 3, 1, 2, (2,), ()): ("P", "P;2R"),
>> >> ('b', 3, 1, 1, (4,), ()): ("P", "P;4"),
>> >> ('b', 3, 1, 2, (4,), ()): ("P", "P;4R"),
>> >> ('b', 3, 1, 1, (8,), ()): ("P", "P"),
>> >> ('b', 3, 1, 1, (8,8), (2,)): ("PA", "PA"),
>> >> ('b', 3, 1, 2, (8,), ()): ("P", "P;R"),
>> >> ('b', 5, 1, 1, (8,8,8,8), ()): ("CMYK", "CMYK"),
>> >> ('b', 6, 1, 1, (8,8,8), ()): ("YCbCr", "YCbCr"),
>> >> ('b', 8, 1, 1, (8,8,8), ()): ("LAB", "LAB"),
>> >> }
>> >> </code from patched 1.1.6
>> >>
>> >>
>> >> TiffImagePlugin.py---------------------------------------------------------------------------------->
>> >>
>> >>
>> >>
>> >> On Sat, Apr 10, 2010 at 6:08 PM, Dan Blacker
>> >> <dan.blacker at googlemail.com>
>> >> wrote:
>> >> > Hello, I wonder if anyone can help with this problem:
>> >> >
>> >> > I am trying to open 16-bit tif files with the Python Imaging Library,
>> >> > with
>> >> > this code:
>> >> >
>> >> > im0 = Image.open (incolor)
>> >> >
>> >> > I get this error:
>> >> >
>> >> > Traceback (most recent call last):
>> >> > File "find.frame.py", line 137, in <module>
>> >> > im0 = Image.open (incolor)
>> >> > File "/usr/lib/python2.6/dist-packages/PIL/Image.py", line 1917, in
>> >> > open
>> >> > raise IOError("cannot identify image file")
>> >> > IOError: cannot identify image file
>> >> >
>> >> > My code works fine with 8bit tiffs. Attatched is an example image
>> >> > file
>> >> > that
>> >> > it won't read in.
>> >> >
>> >> > Any help would be greatly appreciated
>> >> > Dan
>> >> >
>> >> >
>> >> >
>> >> >
>> >> >
>> >> >
>> >> >
>> >> > _______________________________________________
>> >> > Image-SIG maillist - Image-SIG at python.org
>> >> > http://mail.python.org/mailman/listinfo/image-sig
>> >> >
>> >> >
>> >
>> >
>
>
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