[Image-SIG] PIL not loading some TIFF files?

Wed Nov 5 01:06:03 CET 2008

Thanks for the details.

I've passed this info onto the pd/Gem developers so they can add these
tags to all tifs written by the software.

Are these tags required as part of the TIFF spec? Or are they just best
practise?

Thanks again,
B. Bogart

Green Bryan - bgreen wrote:
> It appears that the problem has to do with the following tags not being
> set in the image.  I set these with the tiffset program and PIL then
> loaded the image without any trouble.  I do not know how to set these
> tags in PIL.  Maybe someone has a suggestion?  Also, if you open the
> file in GIMP and save the problem is fixed.  I understand this is not a
> solution for you-- just making note.  
> 
> Most viewers follow fairly closely to the tif spec (they also try and do
> the "right thing" for non-standard software)-- PIL is not so forgiving.
> If needed you could write a script to fix the tags on the fly using the
> command line tiffset program.  It is fast.
>  
> XResolution (282) RATIONAL (5) 1<72> 
> YResolution (283) RATIONAL (5) 1<72> 
> ResolutionUnit (296) SHORT (3) 1<2>
> 
> 
> -----Original Message-----
> From: image-sig-bounces+bryan.green=acxiom.com at python.org
> [mailto:image-sig-bounces+bryan.green=acxiom.com at python.org] On Behalf
> Of Green Bryan - bgreen
> Sent: Tuesday, November 04, 2008 4:52 PM
> To: B. Bogart; image-sig at python.org
> Subject: Re: [Image-SIG] PIL not loading some TIFF files?
> 
> There are some differences between the two.  Mask.tif claims to have
> been created by the GIMP and has a bps of 3 8-bit values.
> Store-0000.tif has a software type of PD/GEM and a bps of 4 8-bit
> values.
> 
> 
> c:\store-00000.tif:
> Magic: 0x4949 <little-endian> Version: 0x2a
> Directory 0: offset 1228808 (0x12c008) next 0 (0)
> ImageWidth (256) SHORT (3) 1<640>
> ImageLength (257) SHORT (3) 1<480>
> BitsPerSample (258) SHORT (3) 4<8 8 8 8>
> Compression (259) SHORT (3) 1<1>
> Photometric (262) SHORT (3) 1<2>
> StripOffsets (273) LONG (4) 1<8>
> SamplesPerPixel (277) SHORT (3) 1<4>
> StripByteCounts (279) LONG (4) 1<1228800>
> PlanarConfig (284) SHORT (3) 1<1>
> Software (305) ASCII (2) 7<PD/GEM\0>
> 
> c:\mask.tif:
> Magic: 0x4949 <little-endian> Version: 0x2a
> Directory 0: offset 921608 (0xe1008) next 0 (0)
> SubFileType (254) LONG (4) 1<0>
> ImageWidth (256) SHORT (3) 1<640>
> ImageLength (257) SHORT (3) 1<480>
> BitsPerSample (258) SHORT (3) 3<8 8 8>
> Compression (259) SHORT (3) 1<1>
> Photometric (262) SHORT (3) 1<2>
> DocumentName (269) ASCII (2) 66</home/bbogart/Projects/i ...>
> ImageDescription (270) ASCII (2) 22<Created with The GIMP\0>
> StripOffsets (273) LONG (4) 8<8 122888 245768 368648 491528 614408
> 737288 860168>
> Orientation (274) SHORT (3) 1<1>
> SamplesPerPixel (277) SHORT (3) 1<3>
> RowsPerStrip (278) SHORT (3) 1<64>
> StripByteCounts (279) LONG (4) 8<122880 122880 122880 122880 122880
> 122880 122880 61440>
> XResolution (282) RATIONAL (5) 1<72>
> YResolution (283) RATIONAL (5) 1<72>
> PlanarConfig (284) SHORT (3) 1<1>
> ResolutionUnit (296) SHORT (3) 1<2>
> 
> -----Original Message-----
> From: image-sig-bounces+bryan.green=acxiom.com at python.org
> [mailto:image-sig-bounces+bryan.green=acxiom.com at python.org] On Behalf
> Of B. Bogart
> Sent: Tuesday, November 04, 2008 4:14 PM
> To: image-sig at python.org
> Subject: [Image-SIG] PIL not loading some TIFF files?
> 
> Hello all,
> 
> I'm unable to get PIL (Image.open) to load certain TIFF files generated
> by another application (using libtiff).
> 
> According to imageMagick the files are the same type:
> 
> mask.tif TIFF 640x480 640x480+0+0 DirectClass 8-bit 900.383kb
> store-00000.tif[1] TIFF 640x480 640x480+0+0 DirectClass 8-bit 1.17202mb
> 
> mask.tif loads fine:
> 
>>>> image = Image.open("mask.tif")
>>>>
> 
> but store-00000.tif fails:
> 
>>>> image = Image.open("store-00000.tif")
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/usr/lib/python2.5/site-packages/PIL/Image.py", line 1917, in
> open
>     raise IOError("cannot identify image file")
> IOError: cannot identify image file
> 
> I'm running PIL 1.1.6-3 in python 2.5 on ubuntu hardy.
> 
> You can grab these two files from:
> 
> http://www.ekran.org/ben/tmp/mask.tif
> http://www.ekran.org/ben/tmp/store-00000.tif
> 
> This is a problem because it is files created by this very application I
> need to be able to read with PIL. Converting them is not practical
> because there will be at least 900 images and processing time is an
> issue.
> 
> Thanks,
> B. Bogart
> _______________________________________________
> Image-SIG maillist  -  Image-SIG at python.org
> http://mail.python.org/mailman/listinfo/image-sig
> ************************************************************************
> *
> The information contained in this communication is confidential, is
> intended only for the use of the recipient named above, and may be
> legally privileged.
> 
> If the reader of this message is not the intended recipient, you are 
> hereby notified that any dissemination, distribution or copying of this
> communication is strictly prohibited.
> 
> If you have received this communication in error, please resend this
> communication to the sender and delete the original message or any copy
> of it from your computer system.
> 
> Thank you.
> ************************************************************************
> *
> 
> _______________________________________________
> Image-SIG maillist  -  Image-SIG at python.org
> http://mail.python.org/mailman/listinfo/image-sig
> 