Tiff files corrupt to adobe

Discussion in 'Photoshop Tutorials' started by gregorydavies, Apr 24, 2006.

  1. I have a lot (100 000+)of tif files that I need to process with
    photoshop, but no adobe product will open a single one of them. They
    work for everything else, windows pic and fax viewer, win photo editor,
    the windows preview thumbnail, even paint, so I know the files aren't
    truly corrupt, but Adobe seems to think they are.

    Can anyone offer any suggestions as to what this might be, or offer any
    solution for how to pre-process these images to get them into a state
    where photoshop can open them?
    gregorydavies, Apr 24, 2006
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  2. gregorydavies

    Kingdom Guest

    wrote in @j33g2000cwa.googlegroups.com:
    Try renaming the file to .tiff instead of .tif and see if it opens

    Could also be that it's not LZW compression so convert from TIF to TIF
    using another program. Saving the file again will rewrite the TIFF header
    and may help, ie make a new back up in another program.
    Kingdom, Apr 24, 2006
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  3. gregorydavies

    toby Guest

    As Kingdom says, the problem is almost certainly that the files use a
    compression type not supported by Photoshop -- a common example is
    G3/G4 fax.

    You can recompress all the files to a supported type using a tool like
    tiffcp[1] from http://www.libtiff.org/

    Alternatively, I have a (free/GPL) Photoshop plugin that uses libtiff
    and can read a wider variety of TIFF files directly. Contact me for

    [1] http://www.libtiff.org/man/tiffcp.1.html
    toby, Apr 24, 2006
  4. This is so emberasing... not only to me but to Adobe for not using deep
    file type checking. They were actually bitmaps named .tif. I tried
    changing the file extension to everything I could think of, but never
    tried .bmp for some reason.

    I found this out when I tried to open them in IrfanView. It advised me
    that the extension was incorrect, so I fixed that, and everything
    worked. They were tifs when they were stored in the database, but I
    think the updates to the extraction program must have decompressed the
    images as it extracted them, so it didn't work the same as it did last

    Thank you everyone for your help. I actually thought it was a
    compression problem for a while too, but I found the right solution
    before I started exploring the possibility of compression.
    gregorydavies, Apr 27, 2006
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