Tiff files corrupt to adobe

G
Posted By
gregorydavies
Apr 24, 2006
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420
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3
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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?
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K
Kingdom
Apr 24, 2006
wrote in news:1145889666.369409.10200
@j33g2000cwa.googlegroups.com:

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?

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.

—
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T
toby
Apr 24, 2006
wrote:
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.

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 details.

[1] http://www.libtiff.org/man/tiffcp.1.html

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?
G
gregorydavies
Apr 27, 2006
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 time.

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.

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