cannot identify image file #1602

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1. radarhere

   added

   TIFF

   on Dec 18, 2015
2. radarhere commented on Dec 18, 2015

   

   radarhere

   on Dec 18, 2015

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   The currently supported TIFF prefixes are MM\000\052, II\052\000, and II\xBC\000

   This TIFF has a prefix of II*\x00
3. playnet commented on Dec 18, 2015

   

   playnet

   on Dec 18, 2015

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   that is, we move on wand?
4. wiredfool commented on Dec 18, 2015

   

   wiredfool

   on Dec 18, 2015

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   It's an invalid image. It's tagged as little-endian, but with a big-endian magic number.

   (Where the magic number is 42, as an int16)

   http://partners.adobe.com/public/developer/en/tiff/TIFF6.pdf

   Bytes 0-1: The byte order used within the file. Legal values are:
   “II” (4949.H)
   “MM” (4D4D.H)
   In the “II” format, byte order is always from the least significant byte to the most
   significant byte, for both 16-bit and 32-bit integers This is called little-endian byte
   order. In the “MM” format, byte order is always from most significant to least
   significant, for both 16-bit and 32-bit integers. This is called big-endian byte
   order.
   Bytes 2-3 An arbitrary but carefully chosen number (42) that further identifies the file as a
   TIFF file.
   The byte order depends on the value of Bytes 0-1.
   
5. cgohlke commented on Dec 19, 2015

   

   cgohlke

   on Dec 19, 2015

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   It's an invalid image.

   I don't think II*\x00 is invalid for TIFF:

   struct.unpack('<H', b'*\x00')[0] == 42
6. wiredfool commented on Dec 21, 2015

   

   wiredfool

   on Dec 21, 2015

   Last edited by radarhere

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   That should teach me to comment quickly before leaving for the weekend.

   This one is returning a format key of:

   format key: ('II', 1, (1,), 1, (16, 16), (2,))
   

   Which is not one that we support. Specifically, multiband images with bit depth > 8 bit are not supported anywhere in the code.
7. wiredfool

   closed this as completedon Dec 29, 2015
8. terramars commented on May 23, 2016

   

   terramars

   on May 23, 2016

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   Having the same problem with single-channel paletted TIFF, created by GDAL, tiffinfo as follows:

   TIFFReadDirectory: Warning, Unknown field with tag 33550 (0x830e) encountered.
   TIFFReadDirectory: Warning, Unknown field with tag 33922 (0x8482) encountered.
   TIFFReadDirectory: Warning, Unknown field with tag 34735 (0x87af) encountered.
   TIFFReadDirectory: Warning, Unknown field with tag 34737 (0x87b1) encountered.
   TIFFReadDirectory: Warning, Unknown field with tag 42113 (0xa481) encountered.
   TIFF Directory at offset 0x34293c6 (54694854)
   Image Width: 10774 Image Length: 12577
   Bits/Sample: 16
   Sample Format: unsigned integer
   Compression Scheme: LZW
   Photometric Interpretation: palette color (RGB from colormap)
   Samples/Pixel: 1
   Rows/Strip: 1
   Planar Configuration: single image plane
   Color Map: (present)
   Tag 33550: 4.999617,4.999789,0.000000
   Tag 33922: 0.000000,0.000000,0.000000,679006.067110,9955209.915048,0.000000
   Tag 34735: 1,1,0,7,1024,0,1,1,1025,0,1,1,1026,34737,22,0,2049,34737,7,22,2054,0,1,9102,3072,0,1,32736,3076,0,1,9001
   Tag 34737: WGS 84 / UTM zone 36S|WGS 84|
   Tag 42113: 0
   Predictor: horizontal differencing 2 (0x2)
9. wiredfool commented on May 24, 2016

   

   wiredfool

   on May 24, 2016

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   That's actually a different issue, as it's a single channel image. (Though, palette, which may add wrinkles for support). Can you post the image?
10. terramars commented on May 24, 2016

    

    terramars

    on May 24, 2016

    Last edited by radarhere

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    Yea I'll make a sample. Will get it to you next week.